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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available for Sale |  |
Amortized Cost | $ 2,992,513 | $ 3,129,530
Gross Unrealized Gains | 301 | 74,116
Gross Unrealized Losses | (346,047) | (16,256)
Estimated Fair Value | 2,646,767 | 3,187,390
Held to Maturity |  |
Amortized Cost | 1,321,256 | 980,384
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (196,207) |
Estimated Fair Value | 1,125,049 |
U.S. Government securities |  |
Available for Sale |  |
Amortized Cost | 226,140 | 127,831
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (7,655) | (213)
Estimated Fair Value | 218,485 | 127,618
State and municipal securities |  |
Available for Sale |  |
Amortized Cost | 1,284,245 | 1,139,187
Gross Unrealized Gains | 283 | 50,161
Gross Unrealized Losses | (178,816) | (678)
Estimated Fair Value | 1,105,712 | 1,188,670
Held to Maturity |  |
Amortized Cost |  | 980,384
Gross Unrealized Gains |  | 11,022
Gross Unrealized Losses |  | (25,539)
Estimated Fair Value |  | 965,867
Corporate debt securities |  |
Available for Sale |  |
Amortized Cost | 459,792 | 373,482
Gross Unrealized Gains | 0 | 13,009
Gross Unrealized Losses | (37,483) | (358)
Estimated Fair Value | 422,309 | 386,133
Collateralized mortgage obligations |  |
Available for Sale |  |
Amortized Cost | 147,155 | 206,532
Gross Unrealized Gains | 0 | 3,581
Gross Unrealized Losses | (13,122) | (754)
Estimated Fair Value | 134,033 | 209,359
Residential mortgage-backed securities |  |
Available for Sale |  |
Amortized Cost | 242,527 | 231,607
Gross Unrealized Gains | 18 | 1,224
Gross Unrealized Losses | (29,847) | (3,036)
Estimated Fair Value | 212,698 | 229,795
Held to Maturity |  |
Amortized Cost | 457,325 | 404,958
Gross Unrealized Gains | 0 | 11,022
Gross Unrealized Losses | (57,480) | (7,067)
Estimated Fair Value | 399,845 | 408,913
Commercial mortgage-backed securities |  |
Available for Sale |  |
Amortized Cost | 631,604 | 974,541
Gross Unrealized Gains | 0 | 6,141
Gross Unrealized Losses | (79,082) | (9,534)
Estimated Fair Value | 552,522 | 971,148
Held to Maturity |  |
Amortized Cost | 863,931 | 575,426
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (138,727) | (18,472)
Estimated Fair Value | $ 725,204 | 556,954
Auction rate securities |  |
Available for Sale |  |
Amortized Cost |  | 76,350
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (1,683)
Estimated Fair Value |  | $ 74,667

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