Securities - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fair Value
Less Than 12 Months	$ 1,481,375	$ 1,113,319
12 Months or Longer	120,722	31,287
Total	1,602,097	1,144,606
Unrealized Losses
Less Than 12 Months	(86,274)	(19,831)
12 Months or Longer	(11,355)	(1,026)
Total	(97,629)	(20,857)
U.S. Treasury securities and obligations of U.S. government agencies
Fair Value
Less Than 12 Months	303	97
12 Months or Longer	229	245
Total	532	342
Unrealized Losses
Less Than 12 Months	(11)	(1)
12 Months or Longer	(2)	(2)
Total	(13)	(3)
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Fair Value
Less Than 12 Months	1,089,150	955,881
12 Months or Longer	100,982	11,953
Total	1,190,132	967,834
Unrealized Losses
Less Than 12 Months	(80,423)	(19,575)
12 Months or Longer	(11,072)	(734)
Total	(91,495)	(20,309)
Private mortgage-backed securities and collateralized mortgage obligations
Fair Value
Less Than 12 Months	84,333	33,640
12 Months or Longer	4,721	9,628
Total	89,054	43,268
Unrealized Losses
Less Than 12 Months	(3,109)	(173)
12 Months or Longer	(165)	(247)
Total	(3,274)	(420)
Collateralized loan obligations
Fair Value
Less Than 12 Months	298,334	123,202
12 Months or Longer	14,790	9,461
Total	313,124	132,663
Unrealized Losses
Less Than 12 Months	(1,928)	(81)
12 Months or Longer	(116)	(43)
Total	(2,044)	(124)
Obligations of state and political subdivisions
Fair Value
Less Than 12 Months	9,255	499
12 Months or Longer	0	0
Total	9,255	499
Unrealized Losses
Less Than 12 Months	(803)	(1)
12 Months or Longer	0	0
Total	$ (803)	$ (1)