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Securities - Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | $ 31,706 | $ 285,714
Less than 12 months, unrealized loss | (326) | (5,681)
12 Months or more, fair value | 1,093,307 | 1,070,442
12 Months or more, unrealized loss | (235,917) | (273,485)
Total fair value | 1,125,013 | 1,356,156
Total unrealized loss | (236,243) | (279,166)
Obligations of State and Political Subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | 4,894 | 13,249
Less than 12 months, unrealized loss | (107) | (231)
12 Months or more, fair value | 447,248 | 445,264
12 Months or more, unrealized loss | (120,220) | (124,584)
Total fair value | 452,142 | 458,513
Total unrealized loss | (120,327) | (124,815)
MBS/CMO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | 3,745 | 176,333
Less than 12 months, unrealized loss | (42) | (2,461)
12 Months or more, fair value | 484,310 | 480,235
12 Months or more, unrealized loss | (86,372) | (113,254)
Total fair value | 488,055 | 656,568
Total unrealized loss | (86,414) | (115,715)
US Gov’t Sponsored Entities & Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | 23,067 | 96,132
Less than 12 months, unrealized loss | (177) | (2,989)
12 Months or more, fair value | 161,749 | 144,943
12 Months or more, unrealized loss | (29,325) | (35,647)
Total fair value | 184,816 | 241,075
Total unrealized loss | $ (29,502) | $ (38,636)

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