Investment Securities - Schedule of AFS Debt Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months, Fair Value	$ 1,206,152	$ 2,808,862
Less Than 12 Months, Gross Unrealized Losses	(76,494)	(56,121)
12 Months or Longer, Fair Value	1,449,762	317,559
12 Months or Longer, Gross Unrealized Losses	(252,970)	(10,167)
Total Fair Value	2,655,914	3,126,421
Total Gross Unrealized Losses	(329,464)	(66,288)
Debt Securities Issued by the U.S. Treasury and Government Agencies
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months, Fair Value	28,574	51,455
Less Than 12 Months, Gross Unrealized Losses	(1,118)	(195)
12 Months or Longer, Fair Value	127,841	9,995
12 Months or Longer, Gross Unrealized Losses	(13,949)	(89)
Total Fair Value	156,415	61,450
Total Gross Unrealized Losses	(15,067)	(284)
Debt Securities Issued by States and Political Subdivisions
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months, Fair Value	11,341	643
Less Than 12 Months, Gross Unrealized Losses	(1,240)	(5)
12 Months or Longer, Fair Value	49,985
12 Months or Longer, Gross Unrealized Losses	(11,342)
Total Fair Value	61,326	643
Total Gross Unrealized Losses	(12,582)	(5)
Debt Securities Issued by Government-Sponsored Enterprises
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months, Fair Value	47,825	814
Less Than 12 Months, Gross Unrealized Losses	(108)	(10)
12 Months or Longer, Fair Value	803	49
12 Months or Longer, Gross Unrealized Losses	(71)	(1)
Total Fair Value	48,628	863
Total Gross Unrealized Losses	(179)	(11)
Debt Securities Issued by Corporations
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months, Fair Value	438,225	249,629
Less Than 12 Months, Gross Unrealized Losses	(7,995)	(2,846)
12 Months or Longer, Fair Value	284,350	64,029
12 Months or Longer, Gross Unrealized Losses	(48,741)	(970)
Total Fair Value	722,575	313,658
Total Gross Unrealized Losses	(56,736)	(3,816)
Residential - Government Agencies
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months, Fair Value	386,809	810,157
Less Than 12 Months, Gross Unrealized Losses	(30,492)	(17,131)
12 Months or Longer, Fair Value	340,824	41,471
12 Months or Longer, Gross Unrealized Losses	(65,723)	(1,635)
Total Fair Value	727,633	851,628
Total Gross Unrealized Losses	(96,215)	(18,766)
Residential - U.S. Government-Sponsored Enterprises
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months, Fair Value	194,684	1,670,500
Less Than 12 Months, Gross Unrealized Losses	(22,294)	(35,711)
12 Months or Longer, Fair Value	598,986	180,205
12 Months or Longer, Gross Unrealized Losses	(103,816)	(6,536)
Total Fair Value	793,670	1,850,705
Total Gross Unrealized Losses	(126,110)	(42,247)
Commercial - Government Agencies - Sponsored Agencies
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months, Fair Value	98,694	25,664
Less Than 12 Months, Gross Unrealized Losses	(13,247)	(223)
12 Months or Longer, Fair Value	46,973	21,810
12 Months or Longer, Gross Unrealized Losses	(9,328)	(936)
Total Fair Value	145,667	47,474
Total Gross Unrealized Losses	(22,575)	(1,159)
Mortgage-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months, Fair Value	680,187	2,506,321
Less Than 12 Months, Gross Unrealized Losses	(66,033)	(53,065)
12 Months or Longer, Fair Value	986,783	243,486
12 Months or Longer, Gross Unrealized Losses	(178,867)	(9,107)
Total Fair Value	1,666,970	2,749,807
Total Gross Unrealized Losses	$ (244,900)	$ (62,172)