Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
| | Fair Value Measurements Using | | | | | |
| | Quoted Prices in Active Markets for Identical Assets (Level 1) | | | Significant Observable Inputs (Level 2) | | | Significant Unobservable Inputs (Level 3) | | | Fair Value | |
June 30, 2025 | | | | | | | | | | | | | | | | |
Securities: | | | | | | | | | | | | | | | | |
Municipal securities | | $ | — | | | $ | 706 | | | $ | — | | | $ | 706 | |
U.S. Treasury Bills and Notes | | | 432,733 | | | | — | | | | — | | | | 432,733 | |
Mortgage-backed securities - residential | | | — | | | | 2,736 | | | | — | | | | 2,736 | |
Collateralized mortgage obligations - residential | | | — | | | | 790 | | | | — | | | | 790 | |
| | $ | 432,733 | | | $ | 4,232 | | | $ | — | | | $ | 436,965 | |
December 31, 2024 | | | | | | | | | | | | | | | | |
Securities: | | | | | | | | | | | | | | | | |
Municipal securities | | $ | — | | | $ | 706 | | | $ | — | | | $ | 706 | |
U.S. Treasury Bills and Notes | | | 246,290 | | | | — | | | | — | | | | 246,290 | |
U.S. government-sponsored agencies | | | — | | | | 109,773 | | | | — | | | | 109,773 | |
Mortgage-backed securities - residential | | | — | | | | 2,911 | | | | — | | | | 2,911 | |
Collateralized mortgage obligations - residential | | | — | | | | 850 | | | | — | | | | 850 | |
| | $ | 246,290 | | | $ | 114,240 | | | $ | — | | | $ | 360,530 | |
|
Fair Value, by Balance Sheet Grouping [Table Text Block] |
| | | | | | Fair Value Measurements at June 30, 2025 Using: | | | | | |
| | Carrying Amount | | | Level 1 | | | Level 2 | | | Level 3 | | | Total | |
Financial assets | | | | | | | | | | | | | | | | | | | | |
Cash and cash equivalents | | $ | 112,236 | | | $ | 111,816 | | | $ | 420 | | | $ | — | | | $ | 112,236 | |
Interest-bearing time deposits in other financial institutions | | | 20,273 | | | | — | | | | 20,273 | | | | — | | | | 20,273 | |
Securities | | | 436,965 | | | | 432,733 | | | | 4,232 | | | | — | | | | 436,965 | |
Loans receivable, net of allowance for credit losses | | | 795,963 | | | | — | | | | — | | | | 757,956 | | | | 757,956 | |
FHLB and FRB stock | | | 7,490 | | | | — | | | | — | | | | — | | | | N /A | |
Accrued interest receivable | | | 4,824 | | | | 430 | | | | 97 | | | | 4,297 | | | | 4,824 | |
Financial liabilities | | | | | | | | | | | | | | | | | | | | |
Certificates of deposit | | | 255,396 | | | | — | | | | 254,158 | | | | — | | | | 254,158 | |
Borrowings | | | 15,000 | | | | — | | | | 15,016 | | | | — | | | | 15,016 | |
Subordinated notes | | | 18,263 | | | | — | | | | 17,205 | | | | — | | | | 17,205 | |
| | | | | | Fair Value Measurements at December 31, 2024 Using: | | | | | |
| | Carrying Amount | | | Level 1 | | | Level 2 | | | Level 3 | | | Total | |
Financial assets | | | | | | | | | | | | | | | | | | | | |
Cash and cash equivalents | | $ | 84,829 | | | $ | 84,399 | | | $ | 430 | | | $ | — | | | $ | 84,829 | |
Interest-bearing time deposits in other financial institutions | | | 34,156 | | | | — | | | | 34,156 | | | | — | | | | 34,156 | |
Securities | | | 360,530 | | | | 246,290 | | | | 114,240 | | | | — | | | | 360,530 | |
Loans receivable, net of allowance for credit losses | | | 887,586 | | | | — | | | | — | | | | 845,303 | | | | 845,303 | |
FHLB and FRB stock | | | 7,490 | | | | — | | | | — | | | | — | | | | N /A | |
Accrued interest receivable | | | 6,401 | | | | 158 | | | | 1,452 | | | | 4,791 | | | | 6,401 | |
Financial liabilities | | | | | | | | | | | | | | | | | | | | |
Certificates of deposit | | | 234,979 | | | | — | | | | 233,639 | | | | — | | | | 233,639 | |
Borrowings | | | 20,000 | | | | — | | | | 19,990 | | | | — | | | | 19,990 | |
Subordinated notes | | | 18,736 | | | | — | | | | 17,571 | | | | — | | | | 17,571 | |
|