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Securities - Securities Available-for-Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,838,911 | $ 1,871,260
Gross Unrealized Gains | 339 | 1,337
Gross Unrealized Losses | (299,980) | (275,765)
Fair Value | 1,539,270 | 1,596,832
U.S. Treasury |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 49,680 | 0
Gross Unrealized Gains | 6 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 49,686 | 0
Obligations of State and Political Subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 826,416 | 889,940
Gross Unrealized Gains | 316 | 1,309
Gross Unrealized Losses | (137,972) | (122,374)
Fair Value | 688,760 | 768,875
MBS/CMO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 746,250 | 761,025
Gross Unrealized Gains | 17 | 28
Gross Unrealized Losses | (123,251) | (116,013)
Fair Value | 623,016 | 645,040
US Gov’t Sponsored Entities & Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 216,565 | 220,295
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (38,757) | (37,378)
Fair Value | $ 177,808 | $ 182,917

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