Securities - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Fair Value
Less Than 12 Months	$ 495,852	$ 1,058,560
12 Months or Longer	1,362,814	753,962
Total	1,858,666	1,812,522
Unrealized Losses
Less Than 12 Months	(27,947)	(73,965)
12 Months or Longer	(225,429)	(174,697)
Total	(253,376)	(248,662)
U.S. Treasury securities and obligations of U.S. government agencies
Fair Value
Less Than 12 Months	32,164	3,788
12 Months or Longer	439	249
Total	32,603	4,037
Unrealized Losses
Less Than 12 Months	(481)	(328)
12 Months or Longer	(16)	(11)
Total	(497)	(339)
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Fair Value
Less Than 12 Months	368,235	646,651
12 Months or Longer	1,002,455	667,520
Total	1,370,690	1,314,171
Unrealized Losses
Less Than 12 Months	(24,697)	(54,956)
12 Months or Longer	(205,993)	(168,127)
Total	(230,690)	(223,083)
Private mortgage-backed securities and collateralized mortgage obligations
Fair Value
Less Than 12 Months	22,704	130,488
12 Months or Longer	106,569	25,234
Total	129,273	155,722
Unrealized Losses
Less Than 12 Months	(788)	(8,255)
12 Months or Longer	(12,564)	(4,576)
Total	(13,352)	(12,831)
Collateralized loan obligations
Fair Value
Less Than 12 Months	58,568	242,370
12 Months or Longer	244,744	60,534
Total	303,312	302,904
Unrealized Losses
Less Than 12 Months	(1,742)	(8,343)
12 Months or Longer	(5,462)	(1,908)
Total	(7,204)	(10,251)
Obligations of state and political subdivisions
Fair Value
Less Than 12 Months	8,575	23,804
12 Months or Longer	8,607	425
Total	17,182	24,229
Unrealized Losses
Less Than 12 Months	(112)	(1,656)
12 Months or Longer	(1,394)	(75)
Total	(1,506)	(1,731)
Other debt securities
Fair Value
Less Than 12 Months	5,606	11,459
12 Months or Longer	0	0
Total	5,606	11,459
Unrealized Losses
Less Than 12 Months	(127)	(427)
12 Months or Longer	0	0
Total	$ (127)	$ (427)