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Securities - Securities with Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value $ 46,600 $ 13,604
Less than 12 months, unrealized loss (114) (176)
12 Months or more, fair value 1,133,333 1,494,312
12 Months or more, unrealized loss (227,699) (275,589)
Total fair value 1,179,933 1,507,916
Total unrealized loss (227,813) (275,765)
Obligations of State and Political Subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 4,461 13,469
Less than 12 months, unrealized loss (17) (175)
12 Months or more, fair value 465,384 668,223
12 Months or more, unrealized loss (105,078) (122,199)
Total fair value 469,845 681,692
Total unrealized loss (105,095) (122,374)
MBS/CMO    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 42,139 135
Less than 12 months, unrealized loss (97) (1)
12 Months or more, fair value 491,567 643,172
12 Months or more, unrealized loss (92,945) (116,012)
Total fair value 533,706 643,307
Total unrealized loss (93,042) (116,013)
US Gov’t Sponsored Entities & Agencies    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 0 0
Less than 12 months, unrealized loss 0 0
12 Months or more, fair value 176,382 182,917
12 Months or more, unrealized loss (29,676) (37,378)
Total fair value 176,382 182,917
Total unrealized loss $ (29,676) $ (37,378)