Securities - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value
Less Than 12 Months	$ 1,496,200	$ 1,113,319
12 Months or Longer	248,091	31,287
Total	1,744,291	1,144,606
Unrealized Losses
Less Than 12 Months	(127,974)	(19,831)
12 Months or Longer	(35,188)	(1,026)
Total	(163,162)	(20,857)
U.S. Treasury securities and obligations of U.S. government agencies
Fair Value
Less Than 12 Months	4,510	97
12 Months or Longer	206	245
Total	4,716	342
Unrealized Losses
Less Than 12 Months	(109)	(1)
12 Months or Longer	(1)	(2)
Total	(110)	(3)
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Fair Value
Less Than 12 Months	1,077,271	955,881
12 Months or Longer	191,277	11,953
Total	1,268,548	967,834
Unrealized Losses
Less Than 12 Months	(109,953)	(19,575)
12 Months or Longer	(33,340)	(734)
Total	(143,293)	(20,309)
Private mortgage-backed securities and collateralized mortgage obligations
Fair Value
Less Than 12 Months	145,025	33,640
12 Months or Longer	3,828	9,628
Total	148,853	43,268
Unrealized Losses
Less Than 12 Months	(7,194)	(173)
12 Months or Longer	(180)	(247)
Total	(7,374)	(420)
Collateralized loan obligations
Fair Value
Less Than 12 Months	251,412	123,202
12 Months or Longer	52,780	9,461
Total	304,192	132,663
Unrealized Losses
Less Than 12 Months	(9,307)	(81)
12 Months or Longer	(1,667)	(43)
Total	(10,974)	(124)
Obligations of state and political subdivisions
Fair Value
Less Than 12 Months	17,982	499
12 Months or Longer	0	0
Total	17,982	499
Unrealized Losses
Less Than 12 Months	(1,411)	(1)
12 Months or Longer	0	0
Total	$ (1,411)	$ (1)