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Securities - Securities Available-for-Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,848,461 | $ 1,796,040
Gross Unrealized Gains | 5,799 | 413
Gross Unrealized Losses | (236,243) | (279,166)
Fair Value | 1,618,017 | 1,517,287
U.S. Treasury |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 144,138 | 110,813
Gross Unrealized Gains | 37 | 51
Gross Unrealized Losses | 0 | 0
Fair Value | 144,175 | 110,864
Obligations of State and Political Subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 603,733 | 587,963
Gross Unrealized Gains | 605 | 21
Gross Unrealized Losses | (120,327) | (124,815)
Fair Value | 484,011 | 463,169
MBS/CMO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 788,902 | 817,553
Gross Unrealized Gains | 4,489 | 341
Gross Unrealized Losses | (86,414) | (115,715)
Fair Value | 706,977 | 702,179
US Gov’t Sponsored Entities & Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 311,688 | 279,711
Gross Unrealized Gains | 668 | 0
Gross Unrealized Losses | (29,502) | (38,636)
Fair Value | $ 282,854 | $ 241,075

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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