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Securities - Securities Available-for-Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,649,299 | $ 1,871,260
Gross Unrealized Gains | 18 | 1,337
Gross Unrealized Losses | (275,505) | (275,765)
Fair Value | 1,373,812 | 1,596,832
U.S. Treasury |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 73,564 | 0
Gross Unrealized Gains | 4 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 73,568 | 0
Obligations of State and Political Subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 700,223 | 889,940
Gross Unrealized Gains | 3 | 1,309
Gross Unrealized Losses | (124,986) | (122,374)
Fair Value | 575,240 | 768,875
MBS/CMO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 681,737 | 761,025
Gross Unrealized Gains | 11 | 28
Gross Unrealized Losses | (113,984) | (116,013)
Fair Value | 567,764 | 645,040
US Gov’t Sponsored Entities & Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 193,775 | 220,295
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (36,535) | (37,378)
Fair Value | $ 157,240 | $ 182,917

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