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Investment Securities - Age of Unrealized Losses and Fair Value of Related Available for Sale Debt Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Fair Value    
Less than 12 Months $ 548,468 $ 15,006
More than 12 Months 1,146,698 1,192,879
Total 1,695,166 1,207,885
Unrealized Losses    
Less than 12 Months (2,593) (30)
More than 12 Months (178,516) (158,580)
Total (181,109) (158,610)
U.S. Treasury securities    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 286,274 288,156
Total 286,274 288,156
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (30,368) (25,615)
Total (30,368) (25,615)
U.S. government agency securities    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 21,457 22,364
Total 21,457 22,364
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (2,434) (2,284)
Total (2,434) (2,284)
Obligations of states and state agencies    
Fair Value    
Less than 12 Months 0 0
More than 12 Months 6,608 8,276
Total 6,608 8,276
Unrealized Losses    
Less than 12 Months 0 0
More than 12 Months (676) (588)
Total (676) (588)
Municipal bonds    
Fair Value    
Less than 12 Months 0 1,019
More than 12 Months 139,210 142,976
Total 139,210 143,995
Unrealized Losses    
Less than 12 Months 0 (4)
More than 12 Months (32,342) (26,261)
Total (32,342) (26,265)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 Months 0 1,019
More than 12 Months 145,818 151,252
Total 145,818 152,271
Unrealized Losses    
Less than 12 Months 0 (4)
More than 12 Months (33,018) (26,849)
Total (33,018) (26,853)
Residential mortgage-backed securities    
Fair Value    
Less than 12 Months 543,665 9,010
More than 12 Months 529,338 569,629
Total 1,073,003 578,639
Unrealized Losses    
Less than 12 Months (2,396) (3)
More than 12 Months (89,021) (78,028)
Total (91,417) (78,031)
Corporate and other debt securities    
Fair Value    
Less than 12 Months 4,803 4,977
More than 12 Months 163,811 161,478
Total 168,614 166,455
Unrealized Losses    
Less than 12 Months (197) (23)
More than 12 Months (23,675) (25,804)
Total $ (23,872) $ (25,827)