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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 3,008,323 |
Gross Unrealized Gains | 18 |
Gross Unrealized Losses | (410,957) |
Estimated Fair Value | 2,597,384 | $ 3,187,390
Amortized Cost, Held to Maturity | 1,339,310 | 980,384
Gross Unrealized Gains, Held to Maturity | 0 | 11,022
Gross Unrealized Losses, Held to Maturity | (197,600) | (25,539)
Debt Securities, Held-to-Maturity, Fair Value | 1,141,710 | 965,867
US Government Debt Securities |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 226,439 | 127,831
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (8,255) | (213)
Estimated Fair Value | 218,184 | 127,618
US Government Agencies Debt Securities |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,053 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (47) |
Estimated Fair Value | 1,006 |
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,287,140 | 1,139,187
Gross Unrealized Gains | 12 | 50,161
Gross Unrealized Losses | (248,967) | (678)
Estimated Fair Value | 1,038,185 | 1,188,670
Corporate Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 436,443 | 373,482
Gross Unrealized Gains | 0 | 13,009
Gross Unrealized Losses | (36,828) | (358)
Estimated Fair Value | 399,615 | 386,133
Collateralized Mortgage Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 155,010 | 206,532
Gross Unrealized Gains | 0 | 3,581
Gross Unrealized Losses | (12,609) | (754)
Estimated Fair Value | 142,401 | 209,359
Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 246,854 | 231,607
Gross Unrealized Gains | 6 | 1,224
Gross Unrealized Losses | (32,608) | (3,036)
Estimated Fair Value | 214,252 | 229,795
Amortized Cost, Held to Maturity | 470,879 | 404,958
Gross Unrealized Gains, Held to Maturity | 0 | 11,022
Gross Unrealized Losses, Held to Maturity | (60,881) | (7,067)
Debt Securities, Held-to-Maturity, Fair Value | 409,998 | 408,913
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 655,384 | 974,541
Gross Unrealized Gains | 0 | 6,141
Gross Unrealized Losses | (71,643) | (9,534)
Estimated Fair Value | 583,741 | 971,148
Amortized Cost, Held to Maturity | 868,431 | 575,426
Gross Unrealized Gains, Held to Maturity | 0 | 0
Gross Unrealized Losses, Held to Maturity | (136,719) | (18,472)
Debt Securities, Held-to-Maturity, Fair Value | $ 731,712 | 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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