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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available for Sale |  |
Amortized Cost | $ 2,698,259 | $ 2,992,513
Gross Unrealized Gains | 1,569 | 301
Gross Unrealized Losses | (301,476) | (346,047)
Estimated Fair Value | 2,398,352 | 2,646,767
Held to Maturity |  |
Amortized Cost | 1,267,922 | 1,321,256
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (195,715) |
Estimated Fair Value | 1,072,207 |
U.S. Government securities |  |
Available for Sale |  |
Amortized Cost | 42,475 | 226,140
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (314) | (7,655)
Estimated Fair Value | 42,161 | 218,485
U.S. Government-sponsored agency securities |  |
Available for Sale |  |
Amortized Cost | 1,038 | 1,050
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (28) | (42)
Estimated Fair Value | 1,010 | 1,008
State and municipal securities |  |
Available for Sale |  |
Amortized Cost | 1,200,571 | 1,284,245
Gross Unrealized Gains | 1,089 | 283
Gross Unrealized Losses | (129,647) | (178,816)
Estimated Fair Value | 1,072,013 | 1,105,712
Held to Maturity |  |
Amortized Cost |  | 1,321,256
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (196,207)
Estimated Fair Value |  | 1,125,049
Corporate debt securities |  |
Available for Sale |  |
Amortized Cost | 480,714 | 459,792
Gross Unrealized Gains | 473 | 0
Gross Unrealized Losses | (40,636) | (37,483)
Estimated Fair Value | 440,551 | 422,309
Collateralized mortgage obligations |  |
Available for Sale |  |
Amortized Cost | 122,824 | 147,155
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (11,390) | (13,122)
Estimated Fair Value | 111,434 | 134,033
Residential mortgage-backed securities |  |
Available for Sale |  |
Amortized Cost | 223,273 | 242,527
Gross Unrealized Gains | 7 | 18
Gross Unrealized Losses | (26,485) | (29,847)
Estimated Fair Value | 196,795 | 212,698
Held to Maturity |  |
Amortized Cost | 407,075 | 457,325
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (51,805) | (57,480)
Estimated Fair Value | 355,270 | 399,845
Commercial mortgage-backed securities |  |
Available for Sale |  |
Amortized Cost | 627,364 | 631,604
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (92,976) | (79,082)
Estimated Fair Value | 534,388 | 552,522
Held to Maturity |  |
Amortized Cost | 860,847 | 863,931
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (143,910) | (138,727)
Estimated Fair Value | $ 716,937 | $ 725,204

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