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Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Investment securities held-to-maturity |  |  |
Amortized cost | $ 2,487,440 | $ 2,683,241 |
Gross Unrealized Losses | (402,704) | (433,073) |
Fair Value | 2,084,736 | 2,250,168 |
Investment securities available for sale |  |  |
Amortized cost | 5,561,006 | 6,216,141 |
Gross Unrealized Gains | 1,898 | 4,054 |
Gross Unrealized Losses | (778,516) | (893,373) |
Fair Value | 4,784,388 | 5,326,822 |
Gross realized gains | 1,335 | 103 | $ 750
Gross realized losses | (1,292) | (73) | (648)
Securities gains, net | 43 | 30 | $ 102
U.S. Treasuries |  |  |
Investment securities available for sale |  |  |
Amortized cost | 74,720 | 272,416 |
Gross Unrealized Losses | (830) | (6,778) |
Fair Value | 73,890 | 265,638 |
U.S. Government agencies |  |  |
Investment securities held-to-maturity |  |  |
Amortized cost | 197,267 | 197,262 |
Gross Unrealized Losses | (24,607) | (29,787) |
Fair Value | 172,660 | 167,475 |
Investment securities available for sale |  |  |
Amortized cost | 246,089 | 245,972 |
Gross Unrealized Losses | (21,383) | (26,884) |
Fair Value | 224,706 | 219,088 |
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |  |
Investment securities held-to-maturity |  |  |
Amortized cost | 1,438,102 | 1,591,646 |
Gross Unrealized Losses | (227,312) | (255,093) |
Fair Value | 1,210,790 | 1,336,553 |
Investment securities available for sale |  |  |
Amortized cost | 1,822,104 | 1,996,405 |
Gross Unrealized Gains | 294 |  |
Gross Unrealized Losses | (264,092) | (298,052) |
Fair Value | 1,558,306 | 1,698,353 |
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises |  |  |
Investment securities held-to-maturity |  |  |
Amortized cost | 444,883 | 474,660 |
Gross Unrealized Losses | (68,139) | (69,664) |
Fair Value | 376,744 | 404,996 |
Investment securities available for sale |  |  |
Amortized cost | 626,735 | 708,337 |
Gross Unrealized Losses | (99,313) | (107,292) |
Fair Value | 527,422 | 601,045 |
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |  |
Investment securities held-to-maturity |  |  |
Amortized cost | 354,055 | 362,586 |
Gross Unrealized Losses | (71,327) | (66,304) |
Fair Value | 282,728 | 296,282 |
Investment securities available for sale |  |  |
Amortized cost | 1,217,125 | 1,196,700 |
Gross Unrealized Gains | 1,516 | 2,542 |
Gross Unrealized Losses | (194,471) | (198,844) |
Fair Value | 1,024,170 | 1,000,398 |
State and municipal obligations |  |  |
Investment securities available for sale |  |  |
Amortized cost | 1,129,750 | 1,269,525 |
Gross Unrealized Gains | 2 | 1,210 |
Gross Unrealized Losses | (152,291) | (205,883) |
Fair Value | 977,461 | 1,064,852 |
Small Business Administration loan-backed securities |  |  |
Investment securities held-to-maturity |  |  |
Amortized cost | 53,133 | 57,087 |
Gross Unrealized Losses | (11,319) | (12,225) |
Fair Value | 41,814 | 44,862 |
Investment securities available for sale |  |  |
Amortized cost | 413,950 | 491,203 |
Gross Unrealized Gains | 86 | 302 |
Gross Unrealized Losses | (42,350) | (46,695) |
Fair Value | 371,686 | 444,810 |
Corporate securities. |  |  |
Investment securities available for sale |  |  |
Amortized cost | 30,533 | 35,583 |
Gross Unrealized Losses | (3,786) | (2,945) |
Fair Value | $ 26,747 | $ 32,638 |

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