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Note 4 - Securities (Tables) | 3 Months Ended
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Mar. 31, 2025
Notes Tables |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gain |  |  | Loss |  |  | Value |
March 31, 2025 |  | (In Thousands) |
Debt Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 674,821 |  |  | $ | 2,244 |  |  | $ | (2 | ) |  | $ | 677,063 |
Mortgage-backed securities |  |  | 232,819 |  |  |  | 398 |  |  |  | (20,068 | ) |  |  | 213,149 |
State and municipal securities |  |  | 10,514 |  |  |  | 1 |  |  |  | (830 | ) |  |  | 9,685 |
Corporate debt |  |  | 321,765 |  |  |  | - |  |  |  | (17,825 | ) |  |  | 303,940 |
Total |  | $ | 1,239,919 |  |  | $ | 2,643 |  |  | $ | (38,725 | ) |  | $ | 1,203,837 |
Debt Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 249,457 |  |  | $ | - |  |  | $ | (15,765 | ) |  | $ | 233,692 |
Mortgage-backed securities |  |  | 444,165 |  |  |  | 109 |  |  |  | (46,105 | ) |  |  | 398,169 |
State and municipal securities |  |  | 8,091 |  |  |  | - |  |  |  | (497 | ) |  |  | 7,594 |
Total |  | $ | 701,713 |  |  | $ | 109 |  |  | $ | (62,367 | ) |  | $ | 639,455 |
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] |
|  | March 31, 2025 |  |  | December 31, 2024 |
|  | Amortized Cost |  |  | Market Value |  |  | Amortized Cost |  |  | Market Value |
|  | (In Thousands) |
Debt securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due within one year |  | $ | 243,991 |  |  | $ | 244,466 |  |  | $ | 223,145 |  |  | $ | 223,477 |
Due from one to five years |  |  | 496,438 |  |  |  | 496,600 |  |  |  | 478,868 |  |  |  | 475,985 |
Due from five to ten years |  |  | 263,270 |  |  |  | 246,647 |  |  |  | 258,611 |  |  |  | 240,114 |
Due after ten years |  |  | 3,401 |  |  |  | 2,975 |  |  |  | 3,000 |  |  |  | 2,550 |
Mortgage-backed securities |  |  | 232,819 |  |  |  | 213,149 |  |  |  | 243,435 |  |  |  | 219,274 |
|  | $ | 1,239,919 |  |  | $ | 1,203,837 |  |  | $ | 1,207,059 |  |  | $ | 1,161,400 |
Debt securities held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due within one year |  | $ | 250 |  |  | $ | 250 |  |  | $ | 250 |  |  | $ | 250 |
Due from one to five years |  |  | 257,298 |  |  |  | 241,036 |  |  |  | 256,743 |  |  |  | 236,586 |
Due from five to ten years |  |  | - |  |  |  | - |  |  |  | 495 |  |  |  | 431 |
Mortgage-backed securities |  |  | 444,165 |  |  |  | 398,169 |  |  |  | 457,365 |  |  |  | 402,229 |
|  | $ | 701,713 |  |  | $ | 639,455 |  |  | $ | 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) |
March 31, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | (2 | ) |  | $ | 29,490 |  |  | $ | - |  |  | $ | - |  |  | $ | (2 | ) |  | $ | 29,490 |
Mortgage-backed securities |  |  | (1 | ) |  |  | 351 |  |  |  | (20,067 | ) |  |  | 174,934 |  |  |  | (20,068 | ) |  |  | 175,285 |
State and municipal securities |  |  | - |  |  |  | - |  |  |  | (830 | ) |  |  | 9,240 |  |  |  | (830 | ) |  |  | 9,240 |
Corporate debt |  |  | (413 | ) |  |  | 19,127 |  |  |  | (17,412 | ) |  |  | 284,812 |  |  |  | (17,825 | ) |  |  | 303,939 |
Total |  | $ | (416 | ) |  | $ | 48,968 |  |  | $ | (38,309 | ) |  | $ | 468,986 |  |  | $ | (38,725 | ) |  | $ | 517,954 |
Debt Securities held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | - |  |  | $ | - |  |  | $ | (15,765 | ) |  | $ | 233,692 |  |  | $ | (15,765 | ) |  | $ | 233,692 |
Mortgage-backed securities |  |  | (194 | ) |  |  | 27,978 |  |  |  | (45,911 | ) |  |  | 352,468 |  |  |  | (46,105 | ) |  |  | 380,446 |
State and municipal securities |  |  | - |  |  |  | - |  |  |  | (497 | ) |  |  | 7,344 |  |  |  | (497 | ) |  |  | 7,344 |
Total |  | $ | (194 | ) |  | $ | 27,978 |  |  | $ | (62,173 | ) |  | $ | 593,504 |  |  | $ | (62,367 | ) |  | $ | 621,482 |
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 |

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