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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 3,034,088 |
Gross Unrealized Gains | 892 |
Gross Unrealized Losses | (256,142) |
Estimated Fair Value | 2,778,838 | $ 3,187,390
Amortized Cost, Held to Maturity | 1,338,963 | 980,384
Gross Unrealized Gains, Held to Maturity | 309 | 11,022
Gross Unrealized Losses, Held to Maturity | (123,947) | (25,539)
HTM securities | 1,215,325 | 965,867
US Government Debt Securities |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 376,505 | 127,831
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (5,239) | (213)
Estimated Fair Value | 371,266 | 127,618
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,239,591 | 1,139,187
Gross Unrealized Gains | 501 | 50,161
Gross Unrealized Losses | (156,615) | (678)
Estimated Fair Value | 1,083,477 | 1,188,670
Corporate Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 413,487 | 373,482
Gross Unrealized Gains | 186 | 13,009
Gross Unrealized Losses | (20,112) | (358)
Estimated Fair Value | 393,561 | 386,133
Collateralized Mortgage Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 154,558 | 206,532
Gross Unrealized Gains | 10 | 3,581
Gross Unrealized Losses | (6,465) | (754)
Estimated Fair Value | 148,103 | 209,359
Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 213,567 | 231,607
Gross Unrealized Gains | 167 | 1,224
Gross Unrealized Losses | (18,375) | (3,036)
Estimated Fair Value | 195,359 | 229,795
Amortized Cost, Held to Maturity | 466,076 | 404,958
Gross Unrealized Gains, Held to Maturity | 297 | 11,022
Gross Unrealized Losses, Held to Maturity | (35,444) | (7,067)
HTM securities | 430,929 | 408,913
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 636,380 | 974,541
Gross Unrealized Gains | 28 | 6,141
Gross Unrealized Losses | (49,336) | (9,534)
Estimated Fair Value | 587,072 | 971,148
Amortized Cost, Held to Maturity | 872,887 | 575,426
Gross Unrealized Gains, Held to Maturity | 12 | 0
Gross Unrealized Losses, Held to Maturity | (88,503) | (18,472)
HTM securities | $ 784,396 | 556,954
Auction Rate Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost |  | 76,350
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (1,683)
Estimated Fair Value |  | 74,667
Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost |  | 3,129,530
Gross Unrealized Gains |  | 74,116
Gross Unrealized Losses |  | (16,256)
Estimated Fair Value |  | $ 3,187,390

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