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Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Investment securities held-to-maturity |  |
Amortized cost | $ 2,446,589,000 | $ 2,487,440,000
Gross Unrealized Losses | (430,022,000) | (402,704,000)
Fair Value | 2,016,567,000 | 2,084,736,000
Investment securities available for sale |  |
Amortized cost | 5,428,594,000 | 5,561,006,000
Gross Unrealized Gains | 986,000 | 1,898,000
Gross Unrealized Losses | (831,180,000) | (778,516,000)
Fair Value | 4,598,400,000 | 4,784,388,000
Sold securities | 0 |
Realized gains or losses | 0 |
U.S. Treasuries |  |
Investment securities available for sale |  |
Amortized cost | 24,920,000 | 74,720,000
Gross Unrealized Losses | (333,000) | (830,000)
Fair Value | 24,587,000 | 73,890,000
U.S. Government agencies |  |
Investment securities held-to-maturity |  |
Amortized cost | 197,269,000 | 197,267,000
Gross Unrealized Losses | (25,821,000) | (24,607,000)
Fair Value | 171,448,000 | 172,660,000
Investment securities available for sale |  |
Amortized cost | 246,118,000 | 246,089,000
Gross Unrealized Losses | (22,313,000) | (21,383,000)
Fair Value | 223,805,000 | 224,706,000
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Investment securities held-to-maturity |  |
Amortized cost | 1,406,440,000 | 1,438,102,000
Gross Unrealized Losses | (246,764,000) | (227,312,000)
Fair Value | 1,159,676,000 | 1,210,790,000
Investment securities available for sale |  |
Amortized cost | 1,780,838,000 | 1,822,104,000
Gross Unrealized Gains | 161,000 | 294,000
Gross Unrealized Losses | (288,576,000) | (264,092,000)
Fair Value | 1,492,423,000 | 1,558,306,000
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises |  |
Investment securities held-to-maturity |  |
Amortized cost | 437,718,000 | 444,883,000
Gross Unrealized Losses | (72,593,000) | (68,139,000)
Fair Value | 365,125,000 | 376,744,000
Investment securities available for sale |  |
Amortized cost | 611,044,000 | 626,735,000
Gross Unrealized Gains | 4,000 |
Gross Unrealized Losses | (102,936,000) | (99,313,000)
Fair Value | 508,112,000 | 527,422,000
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Investment securities held-to-maturity |  |
Amortized cost | 352,399,000 | 354,055,000
Gross Unrealized Losses | (73,294,000) | (71,327,000)
Fair Value | 279,105,000 | 282,728,000
Investment securities available for sale |  |
Amortized cost | 1,213,549,000 | 1,217,125,000
Gross Unrealized Gains | 767,000 | 1,516,000
Gross Unrealized Losses | (202,099,000) | (194,471,000)
Fair Value | 1,012,217,000 | 1,024,170,000
State and municipal obligations |  |
Investment securities available for sale |  |
Amortized cost | 1,127,834,000 | 1,129,750,000
Gross Unrealized Gains | 2,000 | 2,000
Gross Unrealized Losses | (167,477,000) | (152,291,000)
Fair Value | 960,359,000 | 977,461,000
Small Business Administration loan-backed securities |  |
Investment securities held-to-maturity |  |
Amortized cost | 52,763,000 | 53,133,000
Gross Unrealized Losses | (11,550,000) | (11,319,000)
Fair Value | 41,213,000 | 41,814,000
Investment securities available for sale |  |
Amortized cost | 393,770,000 | 413,950,000
Gross Unrealized Gains | 52,000 | 86,000
Gross Unrealized Losses | (43,779,000) | (42,350,000)
Fair Value | 350,043,000 | 371,686,000
Corporate securities. |  |
Investment securities available for sale |  |
Amortized cost | 30,521,000 | 30,533,000
Gross Unrealized Losses | (3,667,000) | (3,786,000)
Fair Value | $ 26,854,000 | $ 26,747,000

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