Securities - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value
Less Than 12 Months	$ 1,113,319	$ 332,099
12 Months or Longer	31,287	73,338
Total	1,144,606	405,437
Unrealized Losses
Less Than 12 Months	(19,831)	(1,530)
12 Months or Longer	(1,026)	(568)
Total	(20,857)	(2,098)
U.S. Treasury securities and obligations of U.S. government agencies
Fair Value
Less Than 12 Months	97	0
12 Months or Longer	245	256
Total	342	256
Unrealized Losses
Less Than 12 Months	(1)	0
12 Months or Longer	(2)	(1)
Total	(3)	(1)
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Fair Value
Less Than 12 Months	955,881	203,405
12 Months or Longer	11,953	569
Total	967,834	203,974
Unrealized Losses
Less Than 12 Months	(19,575)	(1,218)
12 Months or Longer	(734)	(22)
Total	(20,309)	(1,240)
Private mortgage-backed securities and collateralized mortgage obligations
Fair Value
Less Than 12 Months	33,640	23,997
12 Months or Longer	9,628	0
Total	43,268	23,997
Unrealized Losses
Less Than 12 Months	(173)	(210)
12 Months or Longer	(247)	0
Total	(420)	(210)
Collateralized loan obligations
Fair Value
Less Than 12 Months	123,202	104,697
12 Months or Longer	9,461	72,513
Total	132,663	177,210
Unrealized Losses
Less Than 12 Months	(81)	(102)
12 Months or Longer	(43)	(545)
Total	(124)	$ (647)
Obligations of state and political subdivisions
Fair Value
Less Than 12 Months	499
12 Months or Longer	0
Total	499
Unrealized Losses
Less Than 12 Months	(1)
12 Months or Longer	0
Total	$ (1)