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v3.25.2

Note 4 - Securities (Tables) | 6 Months Ended
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Jun. 30, 2025
Notes Tables |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gain |  |  | Loss |  |  | Value |
June 30, 2025 |  | (In Thousands) |
Debt Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 699,077 |  |  | $ | 2,442 |  |  | $ | (37 | ) |  | $ | 701,482 |
Mortgage-backed securities |  |  | 187,193 |  |  |  | 568 |  |  |  | (9,610 | ) |  |  | 178,151 |
State and municipal securities |  |  | 10,366 |  |  |  | 1 |  |  |  | (728 | ) |  |  | 9,639 |
Corporate debt |  |  | 355,315 |  |  |  | 617 |  |  |  | (17,353 | ) |  |  | 338,579 |
Total |  | $ | 1,251,951 |  |  | $ | 3,628 |  |  | $ | (27,728 | ) |  | $ | 1,227,851 |
Debt Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 249,511 |  |  | $ | - |  |  | $ | (13,349 | ) |  | $ | 236,162 |
Mortgage-backed securities |  |  | 428,794 |  |  |  | 131 |  |  |  | (42,904 | ) |  |  | 386,021 |
State and municipal securities |  |  | 8,347 |  |  |  | - |  |  |  | (425 | ) |  |  | 7,922 |
Total |  | $ | 686,652 |  |  | $ | 131 |  |  | $ | (56,678 | ) |  | $ | 630,105 |
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 617,350 |  |  | $ | 580 |  |  | $ | (444 | ) |  | $ | 617,486 |
Mortgage-backed securities |  |  | 243,435 |  |  |  | 49 |  |  |  | (24,210 | ) |  |  | 219,274 |
State and municipal securities |  |  | 10,516 |  |  |  | 1 |  |  |  | (1,000 | ) |  |  | 9,517 |
Corporate debt |  |  | 335,758 |  |  |  | 38 |  |  |  | (20,673 | ) |  |  | 315,123 |
Total |  | $ | 1,207,059 |  |  | $ | 668 |  |  | $ | (46,327 | ) |  | $ | 1,161,400 |
Debt Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 249,403 |  |  | $ | - |  |  | $ | (19,632 | ) |  | $ | 229,771 |
Mortgage-backed securities |  |  | 457,365 |  |  |  | 14 |  |  |  | (55,150 | ) |  |  | 402,229 |
State and municipal securities |  |  | 8,085 |  |  |  | - |  |  |  | (589 | ) |  |  | 7,496 |
Total |  | $ | 714,853 |  |  | $ | 14 |  |  | $ | (75,371 | ) |  | $ | 639,496 |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | June 30, 2025 |  |  | December 31, 2024 |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
|  | (In Thousands) |
Debt securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due within one year |  | $ | 268,240 |  |  | $ | 268,438 |  |  | $ | 223,145 |  |  | $ | 223,477 |
Due from one to five years |  |  | 505,309 |  |  |  | 505,923 |  |  |  | 478,868 |  |  |  | 475,985 |
Due from five to ten years |  |  | 276,806 |  |  |  | 261,360 |  |  |  | 258,611 |  |  |  | 240,114 |
Due after ten years |  |  | 14,403 |  |  |  | 13,979 |  |  |  | 3,000 |  |  |  | 2,550 |
Mortgage-backed securities |  |  | 187,193 |  |  |  | 178,151 |  |  |  | 243,435 |  |  |  | 219,274 |
|  | $ | 1,251,951 |  |  | $ | 1,227,851 |  |  | $ | 1,207,059 |  |  | $ | 1,161,400 |
Debt securities held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due within one year |  | $ | 853 |  |  | $ | 847 |  |  | $ | 250 |  |  | $ | 250 |
Due from one to five years |  |  | 257,005 |  |  |  | 243,237 |  |  |  | 256,743 |  |  |  | 236,586 |
Due from five to ten years |  |  | - |  |  |  | - |  |  |  | 495 |  |  |  | 431 |
Mortgage-backed securities |  |  | 428,794 |  |  |  | 386,021 |  |  |  | 457,365 |  |  |  | 402,229 |
|  | $ | 686,652 |  |  | $ | 630,105 |  |  | $ | 714,853 |  |  | $ | 639,496 |
Gain (Loss) on Securities [Table Text Block] |
|  | Less Than Twelve Months |  |  | Twelve Months or More |  |  | Total |
|  | Gross |  |  |  |  |  |  | Gross |  |  |  |  |  |  | Gross |  |  |  |  |
|  | Unrealized |  |  |  |  |  |  | Unrealized |  |  |  |  |  |  | Unrealized |  |  |  |  |
|  | Losses |  |  | Fair Value |  |  | Losses |  |  | Fair Value |  |  | Losses |  |  | Fair Value |
|  | (In Thousands) |
June 30, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | (37 | ) |  | $ | 68,554 |  |  | $ | - |  |  | $ | - |  |  | $ | (37 | ) |  | $ | 68,554 |
Mortgage-backed securities |  | $ | - |  |  | $ | 72 |  |  |  | (9,610 | ) |  | $ | 106,391 |  |  | $ | (9,610 | ) |  | $ | 106,463 |
State and municipal securities |  |  | - |  |  |  | - |  |  |  | (728 | ) |  |  | 9,194 |  |  |  | (728 | ) |  |  | 9,194 |
Corporate debt |  |  | (706 | ) |  |  | 23,644 |  |  |  | (16,648 | ) |  |  | 249,651 |  |  |  | (17,353 | ) |  |  | 273,295 |
Total |  | $ | (743 | ) |  | $ | 92,270 |  |  | $ | (26,986 | ) |  | $ | 365,236 |  |  | $ | (27,728 | ) |  | $ | 457,506 |
Debt Securities held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | - |  |  | $ | - |  |  | $ | (13,349 | ) |  | $ | 236,163 |  |  | $ | (13,349 | ) |  | $ | 236,162 |
Mortgage-backed securities |  |  | (125 | ) |  |  | 27,124 |  |  |  | (42,779 | ) |  |  | 341,693 |  |  |  | (42,904 | ) |  |  | 368,817 |
State and municipal securities |  |  | (77 | ) |  |  | 2,902 |  |  |  | (348 | ) |  |  | 4,519 |  |  |  | (425 | ) |  |  | 7,421 |
Total |  | $ | (202 | ) |  | $ | 30,026 |  |  | $ | (56,476 | ) |  | $ | 582,375 |  |  | $ | (56,678 | ) |  | $ | 612,400 |
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | (445 | ) |  | $ | 250,547 |  |  | $ | - |  |  | $ | - |  |  | $ | (445 | ) |  | $ | 250,547 |
Mortgage-backed securities |  | $ | (6 | ) |  | $ | 577 |  |  | $ | (24,204 | ) |  | $ | 179,178 |  |  | $ | (24,210 | ) |  | $ | 179,755 |
State and municipal securities |  |  | - |  |  |  | - |  |  |  | (1,000 | ) |  |  | 9,072 |  |  |  | (1,000 | ) |  |  | 9,072 |
Corporate debt |  |  | (1,307 | ) |  |  | 25,596 |  |  |  | (19,366 | ) |  |  | 284,489 |  |  |  | (20,673 | ) |  |  | 310,085 |
Total |  | $ | (1,758 | ) |  | $ | 276,720 |  |  | $ | (44,570 | ) |  | $ | 472,739 |  |  | $ | (46,328 | ) |  | $ | 749,459 |
Debt Securities held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | - |  |  | $ | - |  |  | $ | (19,632 | ) |  | $ | 229,771 |  |  | $ | (19,632 | ) |  | $ | 229,771 |
Mortgage-backed securities |  |  | (536 | ) |  |  | 40,115 |  |  |  | (54,614 | ) |  |  | 356,215 |  |  |  | (55,150 | ) |  |  | 396,330 |
State and municipal securities |  |  | - |  |  |  | - |  |  |  | (589 | ) |  |  | 7,247 |  |  |  | (589 | ) |  |  | 7,247 |
Total |  | $ | (536 | ) |  | $ | 40,115 |  |  | $ | (74,835 | ) |  | $ | 593,233 |  |  | $ | (75,371 | ) |  | $ | 633,348 |
Debt Securities, Available-for-Sale [Table Text Block] |
|  | Six Months Ended June 30, |
|  | 2025 |  |  | 2024 |
|  | (In Thousands) |
Sale proceeds |  | $ | 61,897 |  |  | $ | - |
Gross realized losses |  |  | (8,563 | ) |  |  | - |
Net realized gain (loss) |  | $ | (8,563 | ) |  | $ | - |

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