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Securities - Securities with Unrealized Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value $ 155,417 $ 285,714
Less than 12 months, unrealized loss (1,620) (5,681)
12 Months or more, fair value 1,065,687 1,070,442
12 Months or more, unrealized loss (266,147) (273,485)
Total fair value 1,221,104 1,356,156
Total unrealized loss (267,767) (279,166)
Obligations of State and Political Subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 13,101 13,249
Less than 12 months, unrealized loss (290) (231)
12 Months or more, fair value 437,111 445,264
12 Months or more, unrealized loss (136,046) (124,584)
Total fair value 450,212 458,513
Total unrealized loss (136,336) (124,815)
MBS/CMO    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 77,314 176,333
Less than 12 months, unrealized loss (558) (2,461)
12 Months or more, fair value 482,717 480,235
12 Months or more, unrealized loss (98,864) (113,254)
Total fair value 560,031 656,568
Total unrealized loss (99,422) (115,715)
US Gov’t Sponsored Entities & Agencies    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 65,002 96,132
Less than 12 months, unrealized loss (772) (2,989)
12 Months or more, fair value 145,859 144,943
12 Months or more, unrealized loss (31,237) (35,647)
Total fair value 210,861 241,075
Total unrealized loss $ (32,009) $ (38,636)