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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Available for Sale |  |
Amortized Cost | $ 3,129,530 | $ 2,947,500
Gross Unrealized Gains | 74,116 | 119,921
Gross Unrealized Losses | (16,256) | (5,278)
Estimated Fair Value | 3,187,390 | 3,062,143
Held to Maturity |  |
Amortized Cost | 980,384 | 278,281
Gross Unrealized Gains | 11,022 |
Gross Unrealized Losses | (25,539) |
Estimated Fair Value | 965,867 |
U.S. Government securities |  |
Available for Sale |  |
Amortized Cost | 127,831 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (213) |
Estimated Fair Value | 127,618 |
State and municipal securities |  |
Available for Sale |  |
Amortized Cost | 1,139,187 | 891,327
Gross Unrealized Gains | 50,161 | 61,286
Gross Unrealized Losses | (678) | 0
Estimated Fair Value | 1,188,670 | 952,613
Corporate debt securities |  |
Available for Sale |  |
Amortized Cost | 373,482 | 348,391
Gross Unrealized Gains | 13,009 | 19,445
Gross Unrealized Losses | (358) | (691)
Estimated Fair Value | 386,133 | 367,145
Collateralized mortgage obligations |  |
Available for Sale |  |
Amortized Cost | 206,532 | 491,321
Gross Unrealized Gains | 3,581 | 12,560
Gross Unrealized Losses | (754) | (115)
Estimated Fair Value | 209,359 | 503,766
Residential mortgage-backed securities |  |
Available for Sale |  |
Amortized Cost | 231,607 | 373,779
Gross Unrealized Gains | 1,224 | 4,246
Gross Unrealized Losses | (3,036) | (27)
Estimated Fair Value | 229,795 | 377,998
Held to Maturity |  |
Amortized Cost | 404,958 | 278,281
Gross Unrealized Gains | 11,022 | 18,576
Gross Unrealized Losses | (7,067) | 0
Estimated Fair Value | 408,913 | 296,857
Commercial mortgage-backed securities |  |
Available for Sale |  |
Amortized Cost | 974,541 | 741,172
Gross Unrealized Gains | 6,141 | 22,384
Gross Unrealized Losses | (9,534) | (1,141)
Estimated Fair Value | 971,148 | 762,415
Held to Maturity |  |
Amortized Cost | 575,426 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (18,472) |
Estimated Fair Value | 556,954 |
Auction rate securities |  |
Available for Sale |  |
Amortized Cost | 76,350 | 101,510
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,683) | (3,304)
Estimated Fair Value | $ 74,667 | $ 98,206

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