Securities - Schedule of Unrealized Loss and Fair Value on Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value
Less Than 12 Months	$ 695,385	$ 1,058,560
12 Months or Longer	1,218,194	753,962
Total	1,913,579	1,812,522
Unrealized Losses
Less Than 12 Months	(29,789)	(73,965)
12 Months or Longer	(194,966)	(174,697)
Total	(224,755)	(248,662)
U.S. Treasury securities and obligations of U.S. government agencies
Fair Value
Less Than 12 Months	31,886	3,788
12 Months or Longer	451	249
Total	32,337	4,037
Unrealized Losses
Less Than 12 Months	(316)	(328)
12 Months or Longer	(15)	(11)
Total	(331)	(339)
Mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Fair Value
Less Than 12 Months	499,606	646,651
12 Months or Longer	907,243	667,520
Total	1,406,849	1,314,171
Unrealized Losses
Less Than 12 Months	(23,670)	(54,956)
12 Months or Longer	(179,993)	(168,127)
Total	(203,663)	(223,083)
Private mortgage-backed securities and collateralized mortgage obligations
Fair Value
Less Than 12 Months	76,503	130,488
12 Months or Longer	58,387	25,234
Total	134,890	155,722
Unrealized Losses
Less Than 12 Months	(3,870)	(8,255)
12 Months or Longer	(8,489)	(4,576)
Total	(12,359)	(12,831)
Collateralized loan obligations
Fair Value
Less Than 12 Months	58,915	242,370
12 Months or Longer	246,562	60,534
Total	305,477	302,904
Unrealized Losses
Less Than 12 Months	(1,395)	(8,343)
12 Months or Longer	(5,214)	(1,908)
Total	(6,609)	(10,251)
Obligations of state and political subdivisions
Fair Value
Less Than 12 Months	10,417	23,804
12 Months or Longer	5,551	425
Total	15,968	24,229
Unrealized Losses
Less Than 12 Months	(128)	(1,656)
12 Months or Longer	(1,255)	(75)
Total	(1,383)	(1,731)
Other debt securities
Fair Value
Less Than 12 Months	18,058	11,459
12 Months or Longer	0	0
Total	18,058	11,459
Unrealized Losses
Less Than 12 Months	(410)	(427)
12 Months or Longer	0	0
Total	$ (410)	$ (427)