| Debt Securities, Available-for-Sale [Table Text Block] |
| March 31, 2026 |
|
U.S. Treasury notes |
|
|
U.S. government agency obligations |
|
|
Municipal obligations |
|
|
Mortgage-backed residential obligations |
|
|
Collateralized mortgage obligations |
|
|
Total available-for-sale |
|
| |
|
(Dollars in thousands) |
|
| 1 year or less |
|
$ |
1,003 |
|
|
$ |
— |
|
|
$ |
199 |
|
|
$ |
— |
|
|
$ |
3,864 |
|
|
$ |
5,066 |
|
| 1 to 5 years |
|
|
6,048 |
|
|
|
7,020 |
|
|
|
1,202 |
|
|
|
8,489 |
|
|
|
14,553 |
|
|
|
37,312 |
|
| 5 to 10 years |
|
|
— |
|
|
|
1,223 |
|
|
|
4,579 |
|
|
|
13,109 |
|
|
|
6,251 |
|
|
|
25,162 |
|
| After 10 years |
|
|
— |
|
|
|
— |
|
|
|
5,956 |
|
|
|
1,191 |
|
|
|
2,030 |
|
|
|
9,177 |
|
| Fair value |
|
|
7,051 |
|
|
|
8,243 |
|
|
|
11,936 |
|
|
|
22,789 |
|
|
|
26,698 |
|
|
|
76,717 |
|
| Gross unrealized gains |
|
|
— |
|
|
|
— |
|
|
|
— |
|
|
|
— |
|
|
|
— |
|
|
|
— |
|
| Gross unrealized losses |
|
|
(46 |
) |
|
|
(669 |
) |
|
|
(2,026 |
) |
|
|
(3,031 |
) |
|
|
(2,565 |
) |
|
|
(8,337 |
) |
| Amortized cost |
|
$ |
7,097 |
|
|
$ |
8,912 |
|
|
$ |
13,962 |
|
|
$ |
25,820 |
|
|
$ |
29,263 |
|
|
$ |
85,054 |
|
| December 31, 2025 |
|
U.S. Treasury notes |
|
|
U.S. government agency obligations |
|
|
Municipal obligations |
|
|
Mortgage-backed residential obligations |
|
|
Collateralized mortgage obligations |
|
|
Total available-for-sale |
|
| |
|
(Dollars in thousands) |
|
| 1 year or less |
|
$ |
— |
|
|
$ |
— |
|
|
$ |
198 |
|
|
$ |
— |
|
|
$ |
1,412 |
|
|
$ |
1,610 |
|
| 1 to 5 years |
|
|
7,085 |
|
|
|
7,208 |
|
|
|
1,202 |
|
|
|
8,860 |
|
|
|
17,757 |
|
|
|
42,112 |
|
| 5 to 10 years |
|
|
— |
|
|
|
1,326 |
|
|
|
3,642 |
|
|
|
14,336 |
|
|
|
5,918 |
|
|
|
25,222 |
|
| After 10 years |
|
|
— |
|
|
|
— |
|
|
|
7,104 |
|
|
|
573 |
|
|
|
2,098 |
|
|
|
9,775 |
|
| Fair value |
|
$ |
7,085 |
|
|
$ |
8,534 |
|
|
$ |
12,146 |
|
|
$ |
23,769 |
|
|
$ |
27,185 |
|
|
$ |
78,719 |
|
| Gross unrealized gains |
|
|
4 |
|
|
|
— |
|
|
|
— |
|
|
|
— |
|
|
|
1 |
|
|
|
5 |
|
| Gross unrealized losses |
|
|
(7 |
) |
|
|
(685 |
) |
|
|
(1,829 |
) |
|
|
(2,990 |
) |
|
|
(2,552 |
) |
|
|
(8,063 |
) |
| Amortized cost |
|
$ |
7,088 |
|
|
$ |
9,219 |
|
|
$ |
13,975 |
|
|
$ |
26,759 |
|
|
$ |
29,736 |
|
|
$ |
86,777 |
|
|
| Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
| |
|
Less than 12 Months |
|
|
12 Months or Longer |
|
|
Total |
|
| |
|
(Dollars in thousands) |
|
| |
|
Fair |
|
|
Unrealized |
|
|
Fair |
|
|
Unrealized |
|
|
Fair |
|
|
Unrealized |
|
| |
|
Value |
|
|
Losses |
|
|
Value |
|
|
Losses |
|
|
Value |
|
|
Losses |
|
| March 31, 2026 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| U.S. Treasury notes |
|
$ |
7,051 |
|
|
$ |
46 |
|
|
$ |
— |
|
|
$ |
— |
|
|
$ |
7,051 |
|
|
$ |
46 |
|
| U.S. government agency obligations |
|
|
993 |
|
|
|
8 |
|
|
|
7,250 |
|
|
|
661 |
|
|
|
8,243 |
|
|
|
669 |
|
| Municipal obligations |
|
|
— |
|
|
|
— |
|
|
|
11,936 |
|
|
|
2,026 |
|
|
|
11,936 |
|
|
|
2,026 |
|
| Mortgage-backed residential obligations |
|
|
— |
|
|
|
— |
|
|
|
22,789 |
|
|
|
3,031 |
|
|
|
22,789 |
|
|
|
3,031 |
|
| Collateralized mortgage obligations |
|
|
2,505 |
|
|
|
31 |
|
|
|
24,193 |
|
|
|
2,534 |
|
|
|
26,698 |
|
|
|
2,565 |
|
| Total |
|
$ |
10,549 |
|
|
$ |
85 |
|
|
$ |
66,168 |
|
|
$ |
8,252 |
|
|
$ |
76,717 |
|
|
$ |
8,337 |
|
| December 31, 2025 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| U.S. Treasury notes |
|
$ |
2,990 |
|
|
$ |
7 |
|
|
$ |
— |
|
|
$ |
— |
|
|
$ |
2,990 |
|
|
$ |
7 |
|
| U.S. government agency obligations |
|
|
1,000 |
|
|
|
1 |
|
|
|
7,534 |
|
|
|
684 |
|
|
|
8,534 |
|
|
|
685 |
|
| Municipal obligations |
|
|
— |
|
|
|
— |
|
|
|
12,146 |
|
|
|
1,829 |
|
|
|
12,146 |
|
|
|
1,829 |
|
| Mortgage-backed residential obligations |
|
|
— |
|
|
|
— |
|
|
|
23,769 |
|
|
|
2,990 |
|
|
|
23,769 |
|
|
|
2,990 |
|
| Collateralized mortgage obligations |
|
|
1,530 |
|
|
|
24 |
|
|
|
24,654 |
|
|
|
2,528 |
|
|
|
26,184 |
|
|
|
2,552 |
|
| Total |
|
$ |
5,520 |
|
|
$ |
32 |
|
|
$ |
68,103 |
|
|
$ |
8,031 |
|
|
$ |
73,623 |
|
|
$ |
8,063 |
|
|