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v3.23.3

Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 2,898,568 |
Gross Unrealized Gains | 325 |
Gross Unrealized Losses | (480,025) |
Estimated Fair Value | 2,418,868 | $ 2,646,767
Amortized Cost, Held to Maturity | 1,279,733 | 1,321,256
Gross Unrealized Gains, Held to Maturity | 0 | 0
Gross Unrealized Losses, Held to Maturity | (259,889) | (196,207)
Debt Securities, Held-to-Maturity, Fair Value | 1,019,844 | 1,125,049
US Government Debt Securities |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 225,244 | 226,140
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,798) | (7,655)
Estimated Fair Value | 222,446 | 218,485
US Government Agencies Debt Securities |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,041 | 1,050
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (54) | (42)
Estimated Fair Value | 987 | 1,008
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 1,203,732 | 1,284,245
Gross Unrealized Gains | 0 | 283
Gross Unrealized Losses | (254,586) | (178,816)
Estimated Fair Value | 949,146 | 1,105,712
Corporate Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 479,941 | 459,792
Gross Unrealized Gains | 320 | 0
Gross Unrealized Losses | (51,777) | (37,483)
Estimated Fair Value | 428,484 | 422,309
Collateralized Mortgage Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 127,845 | 147,155
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (15,628) | (13,122)
Estimated Fair Value | 112,217 | 134,033
Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 228,431 | 242,527
Gross Unrealized Gains | 5 | 18
Gross Unrealized Losses | (39,161) | (29,847)
Estimated Fair Value | 189,275 | 212,698
Amortized Cost, Held to Maturity | 418,362 | 457,325
Gross Unrealized Gains, Held to Maturity | 0 | 0
Gross Unrealized Losses, Held to Maturity | (73,552) | (57,480)
Debt Securities, Held-to-Maturity, Fair Value | 344,810 | 399,845
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 632,334 | 631,604
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (116,021) | (79,082)
Estimated Fair Value | 516,313 | 552,522
Amortized Cost, Held to Maturity | 861,371 | 863,931
Gross Unrealized Gains, Held to Maturity | 0 | 0
Gross Unrealized Losses, Held to Maturity | (186,337) | (138,727)
Debt Securities, Held-to-Maturity, Fair Value | $ 675,034 | 725,204
Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost |  | 2,992,513
Gross Unrealized Gains |  | 301
Gross Unrealized Losses |  | (346,047)
Estimated Fair Value |  | $ 2,646,767

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