Securities - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Fair Value
Less Than 12 Months	$ 1,381,037	$ 1,113,319
12 Months or Longer	459,914	31,287
Total	1,840,951	1,144,606
Unrealized Losses
Less Than 12 Months	(143,623)	(19,831)
12 Months or Longer	(103,031)	(1,026)
Total	(246,654)	(20,857)
U.S. Treasury securities and obligations of U.S. government agencies
Fair Value
Less Than 12 Months	3,987	97
12 Months or Longer	292	245
Total	4,279	342
Unrealized Losses
Less Than 12 Months	(318)	(1)
12 Months or Longer	(12)	(2)
Total	(330)	(3)
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Fair Value
Less Than 12 Months	941,663	955,881
12 Months or Longer	398,769	11,953
Total	1,340,432	967,834
Unrealized Losses
Less Than 12 Months	(119,928)	(19,575)
12 Months or Longer	(100,207)	(734)
Total	(220,135)	(20,309)
Private mortgage-backed securities and collateralized mortgage obligations
Fair Value
Less Than 12 Months	162,976	33,640
12 Months or Longer	7,721	9,628
Total	170,697	43,268
Unrealized Losses
Less Than 12 Months	(10,801)	(173)
12 Months or Longer	(997)	(247)
Total	(11,798)	(420)
Collateralized loan obligations
Fair Value
Less Than 12 Months	249,362	123,202
12 Months or Longer	52,711	9,461
Total	302,073	132,663
Unrealized Losses
Less Than 12 Months	(10,404)	(81)
12 Months or Longer	(1,736)	(43)
Total	(12,140)	(124)
Obligations of state and political subdivisions
Fair Value
Less Than 12 Months	23,049	499
12 Months or Longer	421	0
Total	23,470	499
Unrealized Losses
Less Than 12 Months	(2,172)	(1)
12 Months or Longer	(79)	0
Total	$ (2,251)	$ (1)