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Investment Securities - Schedule of Gross Unrealized Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Abstract]    
Fair Value, Less than 12 months $ 40,403 $ 646,226
Unrealized Loss, Less than 12 months (169) (67,665)
Fair Value, 12 months or more 1,228,463 793,685
Unrealized Loss, 12 months or more (187,477) (167,181)
Fair Value, Total 1,268,866 1,439,911
Unrealized Loss, Total (187,646) (234,846)
U.S. government agency securities    
Debt Securities, Available-for-sale [Abstract]    
Fair Value, Less than 12 months 25,923 23,791
Unrealized Loss, Less than 12 months (21) (2,802)
Fair Value, 12 months or more 14,040 16,271
Unrealized Loss, 12 months or more (1,156) (2,303)
Fair Value, Total 39,963 40,062
Unrealized Loss, Total (1,177) (5,105)
Mortgage-backed securities - residential    
Debt Securities, Available-for-sale [Abstract]    
Fair Value, Less than 12 months 0 316,656
Unrealized Loss, Less than 12 months 0 (32,470)
Fair Value, 12 months or more 896,971 717,537
Unrealized Loss, 12 months or more (160,418) (157,859)
Fair Value, Total 896,971 1,034,193
Unrealized Loss, Total (160,418) (190,329)
Mortgage-backed securities - commercial    
Debt Securities, Available-for-sale [Abstract]    
Fair Value, Less than 12 months 0 11,104
Unrealized Loss, Less than 12 months 0 (968)
Fair Value, 12 months or more 16,961 6,540
Unrealized Loss, 12 months or more (1,225) (597)
Fair Value, Total 16,961 17,644
Unrealized Loss, Total (1,225) (1,565)
Municipal securities    
Debt Securities, Available-for-sale [Abstract]    
Fair Value, Less than 12 months 14,480 196,419
Unrealized Loss, Less than 12 months (148) (26,811)
Fair Value, 12 months or more 188,669 36,726
Unrealized Loss, 12 months or more (21,271) (4,602)
Fair Value, Total 203,149 233,145
Unrealized Loss, Total (21,419) (31,413)
U.S. Treasury securities    
Debt Securities, Available-for-sale [Abstract]    
Fair Value, Less than 12 months 0 94,248
Unrealized Loss, Less than 12 months 0 (4,122)
Fair Value, 12 months or more 108,496 13,432
Unrealized Loss, 12 months or more (3,233) (1,499)
Fair Value, Total 108,496 107,680
Unrealized Loss, Total (3,233) (5,621)
Corporate securities    
Debt Securities, Available-for-sale [Abstract]    
Fair Value, Less than 12 months 0 4,008
Unrealized Loss, Less than 12 months 0 (492)
Fair Value, 12 months or more 3,326 3,179
Unrealized Loss, 12 months or more (174) (321)
Fair Value, Total 3,326 7,187
Unrealized Loss, Total $ (174) $ (813)