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Note 4 - Securities (Tables) | 6 Months Ended
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Jun. 30, 2024
Notes Tables |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gain |  |  | Loss |  |  | Value |
June 30, 2024 |  | (In Thousands) |
Debt Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Securities |  | $ | 609,123 |  |  | $ | 38 |  |  | $ | (340 | ) |  | $ | 608,821 |
Mortgage-backed securities |  |  | 268,557 |  |  |  | 1 |  |  |  | (27,195 | ) |  |  | 241,363 |
State and municipal securities |  |  | 11,140 |  |  |  | 1 |  |  |  | (1,162 | ) |  |  | 9,979 |
Corporate debt |  |  | 350,692 |  |  |  | - |  |  |  | (36,469 | ) |  |  | 314,223 |
Total |  | $ | 1,239,512 |  |  | $ | 40 |  |  | $ | (65,166 | ) |  | $ | 1,174,386 |
Debt Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Securities |  | $ | 274,270 |  |  | $ | - |  |  | $ | (23,932 | ) |  | $ | 250,338 |
Mortgage-backed securities |  |  | 484,911 |  |  |  | 18 |  |  |  | (58,379 | ) |  |  | 426,550 |
State and municipal securities |  |  | 8,074 |  |  |  | - |  |  |  | (728 | ) |  |  | 7,346 |
Total |  | $ | 767,255 |  |  | $ | 18 |  |  | $ | (83,039 | ) |  | $ | 684,234 |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Securities |  | $ | 340,556 |  |  | $ | 251 |  |  | $ | - |  |  | $ | 340,807 |
Mortgage-backed securities |  |  | 241,458 |  |  |  | 6 |  |  |  | (25,979 | ) |  |  | 215,485 |
State and municipal securities |  |  | 11,400 |  |  |  | 1 |  |  |  | (1,178 | ) |  |  | 10,223 |
Corporate debt |  |  | 375,676 |  |  |  | - |  |  |  | (42,009 | ) |  |  | 333,667 |
Total |  | $ | 969,090 |  |  | $ | 258 |  |  | $ | (69,166 | ) |  | $ | 900,183 |
Debt Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Securities |  | $ | 508,985 |  |  | $ | - |  |  | $ | (24,718 | ) |  | $ | 484,267 |
Mortgage-backed securities |  |  | 465,615 |  |  |  | 3 |  |  |  | (50,025 | ) |  |  | 415,593 |
State and municipal securities |  |  | 8,063 |  |  |  | - |  |  |  | (732 | ) |  |  | 7,331 |
Total |  | $ | 982,664 |  |  | $ | 3 |  |  | $ | (75,475 | ) |  | $ | 907,191 |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | June 30, 2024 |  |  | December 31, 2023 |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
|  | (In Thousands) |
Debt securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due within one year |  | $ | 566,771 |  |  | $ | 566,467 |  |  | $ | 350,400 |  |  | $ | 350,396 |
Due from one to five years |  |  | 116,025 |  |  |  | 111,359 |  |  |  | 70,016 |  |  |  | 67,334 |
Due from five to ten years |  |  | 285,159 |  |  |  | 252,915 |  |  |  | 304,216 |  |  |  | 264,893 |
Due after ten years |  |  | 3,000 |  |  |  | 2,282 |  |  |  | 3,000 |  |  |  | 2,076 |
Mortgage-backed securities |  |  | 268,557 |  |  |  | 241,363 |  |  |  | 241,458 |  |  |  | 215,485 |
|  | $ | 1,239,512 |  |  | $ | 1,174,386 |  |  | $ | 969,090 |  |  | $ | 900,183 |
Debt securities held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due within one year |  | $ | 25,225 |  |  | $ | 25,176 |  |  | $ | 260,047 |  |  | $ | 257,835 |
Due from one to five years |  |  | 253,830 |  |  |  | 229,634 |  |  |  | 203,481 |  |  |  | 185,741 |
Due from five to ten years |  |  | 3,289 |  |  |  | 2,874 |  |  |  | 53,521 |  |  |  | 48,022 |
Mortgage-backed securities |  |  | 484,911 |  |  |  | 426,550 |  |  |  | 465,615 |  |  |  | 415,593 |
|  | $ | 767,255 |  |  | $ | 684,234 |  |  | $ | 982,664 |  |  | $ | 907,191 |
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, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Securities |  | $ | (340 | ) |  | $ | 164,413 |  |  | $ | - |  |  | $ | - |  |  | $ | (340 | ) |  | $ | 164,413 |
Mortgage-backed securities |  |  | (87 | ) |  |  | 46,401 |  |  |  | (27,108 | ) |  |  | 194,850 |  |  |  | (27,195 | ) |  |  | 241,251 |
State and municipal securities |  |  | - |  |  |  | - |  |  |  | (1,162 | ) |  |  | 9,533 |  |  |  | (1,162 | ) |  |  | 9,533 |
Corporate debt |  |  | (2,634 | ) |  |  | 20,786 |  |  |  | (33,836 | ) |  |  | 293,437 |  |  |  | (36,469 | ) |  |  | 314,223 |
Total |  | $ | (3,061 | ) |  | $ | 231,600 |  |  | $ | (62,106 | ) |  | $ | 497,820 |  |  | $ | (65,166 | ) |  | $ | 729,420 |
Debt Securities held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Securities |  | $ | - |  |  | $ | - |  |  | $ | (23,932 | ) |  | $ | 250,340 |  |  | $ | (23,932 | ) |  | $ | 250,339 |
Mortgage-backed securities |  |  | (564 | ) |  |  | 41,186 |  |  |  | (57,815 | ) |  |  | 378,928 |  |  |  | (58,379 | ) |  |  | 420,114 |
State and municipal securities |  |  | - |  |  |  | - |  |  |  | (728 | ) |  |  | 7,096 |  |  |  | (728 | ) |  |  | 7,096 |
Total |  | $ | (564 | ) |  | $ | 41,186 |  |  | $ | (82,475 | ) |  | $ | 636,364 |  |  | $ | (83,039 | ) |  | $ | 677,549 |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Securities |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
Government Agency Securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Mortgage-backed securities |  |  | (6 | ) |  |  | 704 |  |  |  | (25,973 | ) |  |  | 214,393 |  |  |  | (25,979 | ) |  |  | 215,097 |
State and municipal securities |  |  | - |  |  |  | - |  |  |  | (1,178 | ) |  |  | 9,777 |  |  |  | (1,178 | ) |  |  | 9,777 |
Corporate debt |  |  | (794 | ) |  |  | 15,141 |  |  |  | (41,214 | ) |  |  | 311,666 |  |  |  | (42,009 | ) |  |  | 326,807 |
Total |  | $ | (801 | ) |  | $ | 15,845 |  |  | $ | (68,365 | ) |  | $ | 535,836 |  |  | $ | (69,166 | ) |  | $ | 551,681 |
Debt Securities held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Securities |  | $ | - |  |  | $ | - |  |  | $ | (24,718 | ) |  | $ | 484,267 |  |  | $ | (24,718 | ) |  | $ | 484,267 |
Mortgage-backed securities |  |  | (1 | ) |  |  | 430 |  |  |  | (50,024 | ) |  |  | 411,585 |  |  |  | (50,025 | ) |  |  | 412,015 |
State and municipal securities |  |  | - |  |  |  | - |  |  |  | (732 | ) |  |  | 7,081 |  |  |  | (732 | ) |  |  | 7,081 |
Total |  | $ | (1 | ) |  | $ | 430 |  |  | $ | (75,474 | ) |  | $ | 902,933 |  |  | $ | (75,475 | ) |  | $ | 903,363 |

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