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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Investments [Line Items] |  |
Amortized Cost | $ 3,544,186 |
Gross Unrealized Gains | 19,494 |
Gross Unrealized Losses | (250,384) |
Estimated Fair Value | 3,313,296 | $ 2,398,352
Amortized Cost, Held to Maturity | 1,231,982 | 1,267,922
Gross Unrealized Gains, Held to Maturity | 0 | 0
Gross Unrealized Losses, Held to Maturity | (167,678) | (195,715)
Debt Securities, Held-to-Maturity, Fair Value | 1,064,304 | 1,072,207
US Government Debt Securities |  |
Schedule of Investments [Line Items] |  |
Amortized Cost |  | 42,475
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (314)
Estimated Fair Value |  | 42,161
US Government Agencies Debt Securities |  |
Schedule of Investments [Line Items] |  |
Amortized Cost |  | 1,038
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (28)
Estimated Fair Value |  | 1,010
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 963,138 | 1,200,571
Gross Unrealized Gains | 814 | 1,089
Gross Unrealized Losses | (112,619) | (129,647)
Estimated Fair Value | 851,333 | 1,072,013
Corporate Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 318,631 | 480,714
Gross Unrealized Gains | 473 | 473
Gross Unrealized Losses | (22,524) | (40,636)
Estimated Fair Value | 296,580 | 440,551
Collateralized Mortgage Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 746,328 | 122,824
Gross Unrealized Gains | 11,858 | 0
Gross Unrealized Losses | (8,718) | (11,390)
Estimated Fair Value | 749,468 | 111,434
Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 911,713 | 223,273
Gross Unrealized Gains | 6,349 | 7
Gross Unrealized Losses | (22,427) | (26,485)
Estimated Fair Value | 895,635 | 196,795
Amortized Cost, Held to Maturity | 373,313 | 407,075
Gross Unrealized Gains, Held to Maturity | 0 | 0
Gross Unrealized Losses, Held to Maturity | (44,387) | (51,805)
Debt Securities, Held-to-Maturity, Fair Value | 328,926 | 355,270
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost | 604,376 | 627,364
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (84,096) | (92,976)
Estimated Fair Value | 520,280 | 534,388
Amortized Cost, Held to Maturity | 858,669 | 860,847
Gross Unrealized Gains, Held to Maturity | 0 | 0
Gross Unrealized Losses, Held to Maturity | (123,291) | (143,910)
Debt Securities, Held-to-Maturity, Fair Value | $ 735,378 | 716,937
Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Amortized Cost |  | 2,698,259
Gross Unrealized Gains |  | 1,569
Gross Unrealized Losses |  | (301,476)
Estimated Fair Value |  | $ 2,398,352

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