Securities - Schedule of Unrealized Loss and Fair Value on Investments (Details) $ in Thousands	Mar. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($) security
Fair Value
Less Than 12 Months	$ 209,871	$ 215,988
12 Months or Longer	1,261,873	1,453,668
Total	1,471,744	1,669,656
Unrealized Losses
Less Than 12 Months	(2,411)	(11,128)
12 Months or Longer	(221,186)	(206,586)
Total	$ (223,597)	$ (217,714)
Number of individual securities | security	397	504
U.S. Treasury securities and obligations of U.S. government agencies
Fair Value
Less Than 12 Months	$ 12,911	$ 24,933
12 Months or Longer	13,135	3,594
Total	26,046	28,527
Unrealized Losses
Less Than 12 Months	(75)	(143)
12 Months or Longer	(455)	(335)
Total	(530)	(478)
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Fair Value
Less Than 12 Months	148,889	91,867
12 Months or Longer	836,928	826,324
Total	985,817	918,191
Unrealized Losses
Less Than 12 Months	(2,159)	(9,320)
12 Months or Longer	(190,998)	(174,832)
Total	(193,157)	(184,152)
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Fair Value
Less Than 12 Months	17,741	24,251
12 Months or Longer	209,223	262,666
Total	226,964	286,917
Unrealized Losses
Less Than 12 Months	(125)	(1,270)
12 Months or Longer	(17,847)	(18,295)
Total	(17,972)	(19,565)
Private mortgage-backed securities and collateralized mortgage obligations
Fair Value
Less Than 12 Months	2,599	3,945
12 Months or Longer	113,381	119,475
Total	115,980	123,420
Unrealized Losses
Less Than 12 Months	(28)	(69)
12 Months or Longer	(10,472)	(10,842)
Total	(10,500)	(10,911)
Collateralized loan obligations
Fair Value
Less Than 12 Months	27,408	60,087
12 Months or Longer	80,389	232,545
Total	107,797	292,632
Unrealized Losses
Less Than 12 Months	(17)	(223)
12 Months or Longer	(94)	(1,188)
Total	(111)	(1,411)
Obligations of state and political subdivisions
Fair Value
Less Than 12 Months	323	326
12 Months or Longer	5,679	9,064
Total	6,002	9,390
Unrealized Losses
Less Than 12 Months	(7)	(2)
12 Months or Longer	(1,306)	(1,094)
Total	(1,313)	(1,096)
Other debt securities
Fair Value
Less Than 12 Months	0	10,579
12 Months or Longer	3,138	0
Total	3,138	10,579
Unrealized Losses
Less Than 12 Months	0	(101)
12 Months or Longer	(14)	0
Total	$ (14)	$ (101)