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Note 4 - Securities (Tables) | 3 Months Ended
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Mar. 31, 2024
Notes Tables |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Market |
|  | Cost |  |  | Gain |  |  | Loss |  |  | Value |
March 31, 2024 |  | (In Thousands) |
Debt Securities Available-for-Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Securities |  | $ | 494,156 |  |  | $ | 10 |  |  | $ | (197 | ) |  | $ | 493,969 |
Mortgage-backed securities |  |  | 281,343 |  |  |  | 249 |  |  |  | (26,677 | ) |  |  | 254,915 |
State and municipal securities |  |  | 11,142 |  |  |  | 1 |  |  |  | (1,186 | ) |  |  | 9,958 |
Corporate debt |  |  | 352,684 |  |  |  | 60 |  |  |  | (37,657 | ) |  |  | 315,086 |
Total |  | $ | 1,139,325 |  |  | $ | 320 |  |  | $ | (65,716 | ) |  | $ | 1,073,929 |
Debt Securities Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Securities |  | $ | 393,932 |  |  | $ | - |  |  | $ | (25,065 | ) |  | $ | 368,868 |
Mortgage-backed securities |  |  | 465,695 |  |  |  | 5 |  |  |  | (56,634 | ) |  |  | 409,066 |
State and municipal securities |  |  | 8,069 |  |  |  | - |  |  |  | (733 | ) |  |  | 7,336 |
Total |  | $ | 867,696 |  |  | $ | 5 |  |  | $ | (82,431 | ) |  | $ | 785,270 |
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] |
|  | March 31, 2024 |  |  | December 31, 2023 |
|  | Amortized Cost |  |  | Market Value |  |  | Amortized Cost |  |  | Market Value |
|  | (In Thousands) |
Debt securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due within one year |  | $ | 430,857 |  |  | $ | 430,760 |  |  | $ | 350,400 |  |  | $ | 350,396 |
Due from one to five years |  |  | 132,967 |  |  |  | 129,779 |  |  |  | 70,016 |  |  |  | 67,334 |
Due from five to ten years |  |  | 291,157 |  |  |  | 256,407 |  |  |  | 304,216 |  |  |  | 264,893 |
Due after ten years |  |  | 3,000 |  |  |  | 2,068 |  |  |  | 3,000 |  |  |  | 2,076 |
Mortgage-backed securities |  |  | 281,343 |  |  |  | 254,915 |  |  |  | 241,458 |  |  |  | 215,485 |
|  | $ | 1,139,325 |  |  | $ | 1,073,929 |  |  | $ | 969,090 |  |  | $ | 900,183 |
Debt securities held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due within one year |  | $ | 144,940 |  |  | $ | 144,283 |  |  | $ | 260,047 |  |  | $ | 257,835 |
Due from one to five years |  |  | 253,772 |  |  |  | 229,043 |  |  |  | 203,481 |  |  |  | 185,741 |
Due from five to ten years |  |  | 3,289 |  |  |  | 2,878 |  |  |  | 53,521 |  |  |  | 48,022 |
Mortgage-backed securities |  |  | 465,695 |  |  |  | 409,066 |  |  |  | 465,615 |  |  |  | 415,593 |
|  | $ | 867,696 |  |  | $ | 785,270 |  |  | $ | 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) |
March 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Securities |  | $ | (197 | ) |  | $ | 479,762 |  |  | $ | - |  |  | $ | - |  |  | $ | (197 | ) |  | $ | 479,762 |
Government Agency Securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Mortgage-backed securities |  |  | (2 | ) |  |  | 161 |  |  |  | (26,674 | ) |  |  | 205,195 |  |  |  | (26,677 | ) |  |  | 205,356 |
State and municipal securities |  |  | - |  |  |  | - |  |  |  | (1,186 | ) |  |  | 9,512 |  |  |  | (1,186 | ) |  |  | 9,512 |
Corporate debt |  |  | (2,392 | ) |  |  | 11,108 |  |  |  | (35,265 | ) |  |  | 294,003 |  |  |  | (37,657 | ) |  |  | 305,111 |
Total |  | $ | (2,591 | ) |  | $ | 491,031 |  |  | $ | (63,125 | ) |  | $ | 508,710 |  |  | $ | (65,716 | ) |  | $ | 999,741 |
Debt Securities held-to-maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Securities |  | $ | - |  |  | $ | - |  |  | $ | (25,065 | ) |  | $ | 368,868 |  |  | $ | (25,065 | ) |  | $ | 368,868 |
Mortgage-backed securities |  |  | (162 | ) |  |  | 9,895 |  |  |  | (56,471 | ) |  |  | 393,887 |  |  |  | (56,634 | ) |  |  | 405,323 |
State and municipal securities |  |  | - |  |  |  | - |  |  |  | (733 | ) |  |  | 7,086 |  |  |  | (733 | ) |  |  | 7,086 |
Total |  | $ | (162 | ) |  | $ | 9,895 |  |  | $ | (82,269 | ) |  | $ | 771,382 |  |  | $ | (82,431 | ) |  | $ | 779,735 |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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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