| Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
| | | June 30, 2026 | |
| | | Total | | | Fair Value Measurements Using | |
| (Amounts in thousands) | | Fair Value | | | Level 1 | | | Level 2 | | | Level 3 | |
| Available-for-sale debt securities | | | | | | | | | | | | | | | | |
| U.S. Agency securities | | $ | 1,379 | | | $ | - | | | $ | 1,379 | | | $ | - | |
| U.S. Treasury securities | | | 124,750 | | | $ | - | | | | 124,750 | | | $ | - | |
| Municipal securities | | | 7,007 | | | | - | | | | 7,007 | | | | - | |
| Corporate Notes | | | 19,673 | | | | - | | | | 19,673 | | | | - | |
| Agency mortgage-backed securities | | | 86,241 | | | | - | | | | 86,241 | | | | - | |
| Total available-for-sale debt securities | | | 239,050 | | | | - | | | | 239,050 | | | | - | |
| Equity securities | | | 55 | | | | - | | | | 55 | | | | - | |
| Fair value loans | | | 2,346 | | | | - | | | | - | | | | 2,346 | |
| Derivative assets | | | 47 | | | | - | | | | 47 | | | | - | |
| Deferred compensation assets | | | 13,265 | | | | 13,265 | | | | - | | | | - | |
| Deferred compensation liabilities | | | 14,797 | | | | 14,797 | | | | - | | | | - | |
| | | December 31, 2025 | |
| | | Total | | | Fair Value Measurements Using | |
| (Amounts in thousands) | | Fair Value | | | Level 1 | | | Level 2 | | | Level 3 | |
| Available-for-sale debt securities | | | | | | | | | | | | | | | | |
| U.S. Treasury securities | | $ | 10,929 | | | $ | - | | | $ | 10,929 | | | $ | - | |
| Municipal securities | | | 9,262 | | | | - | | | | 9,262 | | | | - | |
| Corporate notes | | | 24,560 | | | | - | | | | 24,560 | | | | - | |
| Agency mortgage-backed securities | | | 87,937 | | | | - | | | | 87,937 | | | | - | |
| Total available-for-sale debt securities | | | 132,688 | | | | - | | | | 132,688 | | | | - | |
| Equity securities | | | 55 | | | | - | | | | 55 | | | | - | |
| Fair value loans | | | 2,596 | | | | - | | | | - | | | | 2,596 | |
| Derivative assets | | | 41 | | | | - | | | | 41 | | | | - | |
| Deferred compensation assets | | | 10,951 | | | | 10,951 | | | | - | | | | - | |
| Deferred compensation liabilities | | | 12,479 | | | | 12,479 | | | | - | | | | - | |
|
| Fair Value, by Balance Sheet Grouping [Table Text Block] |
| | | June 30, 2026 | |
| | | Carrying | | | | | | | Fair Value Measurements Using | |
| (Amounts in thousands) | | Amount | | | Fair Value | | | Level 1 | | | Level 2 | | | Level 3 | |
| Assets | | | | | | | | | | | | | | | | | | | | |
| Cash and cash equivalents | | $ | 591,913 | | | $ | 591,913 | | | $ | 591,913 | | | $ | - | | | $ | - | |
| Debt securities available-for-sale | | | 239,050 | | | | 239,050 | | | | - | | | | 239,050 | | | | - | |
| Equity securities | | | 55 | | | | 55 | | | | - | | | | 55 | | | | - | |
| Loans held for investment, net of allowance | | | 2,427,092 | | | | 2,261,394 | | | | - | | | | - | | | | 2,261,394 | |
| Derivative financial assets | | | 47 | | | | 47 | | | | - | | | | 47 | | | | - | |
| Interest receivable | | | 9,344 | | | | 9,344 | | | | - | | | | 667 | | | | 8,677 | |
| Deferred compensation assets | | | 13,265 | | | | 13,265 | | | | 13,265 | | | | - | | | | - | |
| | | | | | | | | | | | | | | | | | | | | |
| Liabilities | | | | | | | | | | | | | | | | | | | | |
| Time deposits | | | 207,903 | | | | 206,439 | | | | - | | | | 206,439 | | | | - | |
| Securities sold under agreements to repurchase | | | 2,924 | | | | 2,924 | | | | - | | | | 2,924 | | | | - | |
| Interest payable | | | 547 | | | | 547 | | | | - | | | | 547 | | | | - | |
| Deferred compensation liabilities | | | 14,797 | | | | 14,797 | | | | 14,797 | | | | - | | | | - | |
| | | December 31, 2025 | |
| | | Carrying | | | | | | | Fair Value Measurements Using | |
| (Amounts in thousands) | | Amount | | | Fair Value | | | Level 1 | | | Level 2 | | | Level 3 | |
| Assets | | | | | | | | | | | | | | | | | | | | |
| Cash and cash equivalents | | $ | 512,240 | | | $ | 512,240 | | | $ | 512,240 | | | $ | - | | | $ | - | |
| Debt securities available-for-sale | | | 132,688 | | | | 132,688 | | | | - | | | | 132,688 | | | | - | |
| Equity securities | | | 55 | | | | 55 | | | | - | | | | 55 | | | | - | |
| Loans held for investment, net of allowance | | | 2,283,994 | | | | 2,105,996 | | | | - | | | | - | | | | 2,105,996 | |
| Interest receivable | | | 8,720 | | | | 8,720 | | | | - | | | | 681 | | | | 8,039 | |
| Deferred compensation assets | | | 10,951 | | | | 10,951 | | | | 10,951 | | | | - | | | | - | |
| Derivative assets | | | 41 | | | | 41 | | | | - | | | | 41 | | | | - | |
| | | | | | | | | | | | | | | | | | | | | |
| Liabilities | | | | | | | | | | | | | | | | | | | | |
| Time deposits | | | 200,368 | | | | 198,815 | | | | - | | | | 198,815 | | | | - | |
| Securities sold under agreements to repurchase | | | 1,214 | | | | 1,214 | | | | - | | | | 1,214 | | | | - | |
| Interest payable | | | 570 | | | | 570 | | | | - | | | | 570 | | | | - | |
| Deferred compensation liabilities | | | 12,479 | | | | 12,479 | | | | 12,479 | | | | - | | | | - | |
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