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Investment Securities - Age of Unrealized Losses and Fair Value of Related Available for Sale Debt Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Fair Value    
Less than 12 Months $ 260,237 $ 15,006
More than 12 Months 1,183,879 1,192,879
Total 1,444,116 1,207,885
Unrealized Losses    
Less than 12 Months (514) (30)
More than 12 Months (130,717) (158,580)
Total (131,231) (158,610)
U.S. Treasury securities    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 296,061 288,156
Total 296,061 288,156
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (22,029) (25,615)
Total (22,029) (25,615)
U.S. government agency securities    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 21,927 22,364
Total 21,927 22,364
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (1,446) (2,284)
Total (1,446) (2,284)
Obligations of states and state agencies    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 6,631 8,276
Total 6,631 8,276
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (504) (588)
Total (504) (588)
Municipal bonds    
Fair Value    
Less than 12 Months 0 1,019
More than 12 Months 146,966 142,976
Total 146,966 143,995
Unrealized Losses    
Less than 12 Months 0 (4)
More than 12 Months (24,886) (26,261)
Total (24,886) (26,265)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 Months 0 1,019
More than 12 Months 153,597 151,252
Total 153,597 152,271
Unrealized Losses    
Less than 12 Months 0 (4)
More than 12 Months (25,390) (26,849)
Total (25,390) (26,853)
Residential mortgage-backed securities    
Fair Value    
Less than 12 Months 260,237 9,010
More than 12 Months 537,074 569,629
Total 797,311 578,639
Unrealized Losses    
Less than 12 Months (514) (3)
More than 12 Months (64,480) (78,028)
Total (64,994) (78,031)
Corporate and other debt securities    
Fair Value    
Less than 12 Months 0 4,977
More than 12 Months 175,220 161,478
Total 175,220 166,455
Unrealized Losses    
Less than 12 Months 0 (23)
More than 12 Months (17,372) (25,804)
Total $ (17,372) $ (25,827)