Note 3 - Investment Securities (Tables)
|
3 Months Ended |
Mar. 31, 2025 |
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| Notes Tables |
|
| Marketable Securities [Table Text Block] |
| | | March 31, 2025 | |
| | | Amortized | | | Unrealized | | | Unrealized | | | Allowance for | | | Fair | |
| (dollars in thousands) | | Cost | | | Gains | | | Losses | | | Credit Losses | | | Value | |
| Available-for-sale | | | | | | | | | | | | | | | | | | | | |
| U.S. Treasury and agencies | | $ | 10,676 | | | $ | 2 | | | $ | (2 | ) | | $ | — | | | $ | 10,676 | |
| Mortgage backed securities | | | | | | | | | | | | | | | | | | | | |
| Residential agency | | | 581,983 | | | | 35 | | | | (80,318 | ) | | | — | | | | 501,700 | |
| Commercial | | | 1,343 | | | | — | | | | (69 | ) | | | — | | | | 1,274 | |
| Asset backed securities | | | 18 | | | | — | | | | — | | | | — | | | | 18 | |
| Corporate bonds | | | 57,984 | | | | — | | | | (3,924 | ) | | | — | | | | 54,060 | |
| Total available-for-sale investment securities | | | 652,004 | | | | 37 | | | | (84,313 | ) | | | — | | | | 567,728 | |
| Held-to-maturity | | | | | | | | | | | | | | | | | | | | |
| Obligations of state and political agencies | | | 115,636 | | | | — | | | | (9,941 | ) | | | 76 | | | | 105,695 | |
| Mortgage backed securities | | | | | | | | | | | | | | | | | | | | |
| Residential agency | | | 153,124 | | | | — | | | | (24,244 | ) | | | 53 | | | | 128,880 | |
| Total held-to-maturity investment securities | | | 268,760 | | | | — | | | | (34,185 | ) | | | 129 | | | | 234,575 | |
| Total investment securities | | $ | 920,764 | | | $ | 37 | | | $ | (118,498 | ) | | $ | 129 | | | $ | 802,303 | |
| | | December 31, 2024 | |
| | | Amortized | | | Unrealized | | | Unrealized | | | Allowance for | | | Fair | |
| (dollars in thousands) | | Cost | | | Gains | | | Losses | | | Credit Losses | | | Value | |
| Available-for-sale | | | | | | | | | | | | | | | | | | | | |
| U.S. Treasury and agencies | | $ | 30,691 | | | $ | 18 | | | $ | (2 | ) | | | — | | | $ | 30,707 | |
| Mortgage backed securities | | | | | | | | | | | | | | | | | | | | |
| Residential agency | | | 596,510 | | | | 1 | | | | (92,805 | ) | | | — | | | | 503,706 | |
| Commercial | | | 1,350 | | | | — | | | | (99 | ) | | | — | | | | 1,251 | |
| Asset backed securities | | | 19 | | | | — | | | | — | | | | — | | | | 19 | |
| Corporate bonds | | | 57,986 | | | | — | | | | (5,616 | ) | | | — | | | | 52,370 | |
| Total available-for-sale investment securities | | | 686,556 | | | | 19 | | | | (98,522 | ) | | | — | | | | 588,053 | |
| Held-to-maturity | | | | | | | | | | | | | | | | | | | | |
| Obligations of state and political agencies | | | 119,623 | | | | — | | | | (11,638 | ) | | | 77 | | | | 107,985 | |
| Mortgage backed securities | | | | | | | | | | | | | | | | | | | | |
| Residential agency | | | 156,093 | | | | — | | | | (27,092 | ) | | | 54 | | | | 129,001 | |
| Total held-to-maturity investment securities | | | 275,716 | | | | — | | | | (38,730 | ) | | | 131 | | | | 236,986 | |
| Total investment securities | | $ | 962,272 | | | $ | 19 | | | $ | (137,252 | ) | | $ | 131 | | | $ | 825,039 | |
|
| Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
| | | | | | | March 31, 2025 | |
| | | | | | | Less than 12 Months | | | Over 12 Months | | | Total | |
| | | Number of | | | Unrealized | | | Fair | | | Unrealized | | | Fair | | | Unrealized | | | Fair | |
| (dollars in thousands) | | Holdings | | | Losses | | | Value | | | Losses | | | Value | | | Losses | | | Value | |
| Available-for-sale | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| U.S. Treasury and agencies | | | 2 | | | $ | (1 | ) | | $ | 351 | | | $ | (1 | ) | | $ | 308 | | | $ | (2 | ) | | $ | 659 | |
| Mortgage backed securities | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Residential agency | | | 117 | | | | (262 | ) | | | 56,036 | | | | (80,056 | ) | | | 387,207 | | | | (80,318 | ) | | | 443,243 | |
| Commercial | | | 1 | | | | — | | | | — | | | | (69 | ) | | | 1,274 | | | | (69 | ) | | | 1,274 | |
| Asset backed securities | | | 3 | | | | — | | | | — | | | | — | | | | 18 | | | | — | | | | 18 | |
| Corporate bonds | | | 12 | | | | — | | | | — | | | | (3,924 | ) | | | 54,060 | | | | (3,924 | ) | | | 54,060 | |
| Total available-for-sale investment securities | | | 135 | | | $ | (263 | ) | | $ | 56,387 | | | $ | (84,050 | ) | | $ | 442,867 | | | $ | (84,313 | ) | | $ | 499,254 | |
| | | | | | | December 31, 2024 | |
| | | | | | | Less than 12 Months | | | Over 12 Months | | | Total | |
| | | Number of | | | Unrealized | | | Fair | | | Unrealized | | | Fair | | | Unrealized | | | Fair | |
| (dollars in thousands) | | Holdings | | | Losses | | | Value | | | Losses | | | Value | | | Losses | | | Value | |
| Available-for-sale | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| U.S. Treasury and agencies | | | 1 | | | $ | — | | | $ | — | | | $ | (2 | ) | | $ | 327 | | | $ | (2 | ) | | $ | 327 | |
| Mortgage backed securities | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Residential agency | | | 124 | | | | (1,715 | ) | | | 116,800 | | | | (91,090 | ) | | | 386,864 | | | | (92,805 | ) | | | 503,664 | |
| Commercial | | | 1 | | | | — | | | | — | | | | (99 | ) | | | 1,251 | | | | (99 | ) | | | 1,251 | |
| Asset backed securities | | | 3 | | | | — | | | | — | | | | — | | | | 18 | | | | — | | | | 18 | |
| Corporate bonds | | | 12 | | | | — | | | | — | | | | (5,616 | ) | | | 52,370 | | | | (5,616 | ) | | | 52,370 | |
| Total available-for-sale investment securities | | | 141 | | | $ | (1,715 | ) | | $ | 116,800 | | | $ | (96,807 | ) | | $ | 440,830 | | | $ | (98,522 | ) | | $ | 557,630 | |
|
| Investments Classified by Contractual Maturity Date [Table Text Block] |
| | | Held-to-maturity | | | Available-for-sale | |
| | | Carrying | | | Fair | | | Amortized | | | Fair | |
| (dollars in thousands) | | Value | | | Value | | | Cost | | | Value | |
| Due within one year or less | | $ | 6,911 | | | $ | 6,808 | | | $ | 4,999 | | | $ | 4,999 | |
| Due after one year through five years | | | 54,015 | | | | 50,595 | | | | 6,667 | | | | 6,598 | |
| Due after five years through ten years | | | 47,247 | | | | 41,740 | | | | 58,002 | | | | 54,077 | |
| Due after 10 years | | | 7,463 | | | | 6,552 | | | | 353 | | | | 354 | |
| | | | 115,636 | | | | 105,695 | | | | 70,021 | | | | 66,028 | |
| Mortgage-backed securities | | | | | | | | | | | | | | | | |
| Residential agency | | | 153,124 | | | | 128,880 | | | | 581,983 | | | | 501,700 | |
| Total investment securities | | $ | 268,760 | | | $ | 234,575 | | | $ | 652,004 | | | $ | 567,728 | |
|
| Investment [Table Text Block] |
| | | March 31, | | | December 31, | |
| (dollars in thousands) | | 2025 | | | 2024 | |
| Federal Reserve | | $ | 8,331 | | | $ | 7,519 | |
| FHLB | | | 12,871 | | | | 13,656 | |
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