Investment Securities - Unrealized Losses on Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 1,057,030
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(101,408)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,298,565	3,777,773
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(352,454)	(709,728)
Debt Securities, Available-for-sale, Unrealized Loss Position	2,298,565	4,834,803
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(352,454)	(811,136)
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	52,556
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(6,193)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,187,609	2,189,485
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(201,192)	(436,803)
Debt Securities, Available-for-sale, Unrealized Loss Position	1,187,609	2,242,041
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(201,192)	(442,996)
US Treasury Securities [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	4,972
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(26)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	665,098
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	(101,049)
Debt Securities, Available-for-sale, Unrealized Loss Position	0	670,070
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0	(101,075)
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	316,892
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(31,139)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	253,306	170,714
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(15,333)	(30,747)
Debt Securities, Available-for-sale, Unrealized Loss Position	253,306	487,606
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(15,333)	(61,886)
Government agency and government-sponsored enterprise collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	245,755
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(22,748)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	284,334	211,309
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(36,650)	(37,363)
Debt Securities, Available-for-sale, Unrealized Loss Position	284,334	457,064
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(36,650)	(60,111)
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	37,380
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(3,129)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	28,083	298,266
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,109)	(57,269)
Debt Securities, Available-for-sale, Unrealized Loss Position	28,083	335,646
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1,109)	(60,398)
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	302,643
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(32,124)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	265,431	4,256
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(60,254)	(744)
Debt Securities, Available-for-sale, Unrealized Loss Position	265,431	306,899
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(60,254)	(32,868)
Private Label Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	19,261
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(1,294)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	158,412	147,464
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(34,659)	(39,105)
Debt Securities, Available-for-sale, Unrealized Loss Position	158,412	166,725
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(34,659)	(40,399)
Collateralized Loan Obligations [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	27,704
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(1,818)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	66,886	74,558
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(752)	(5,080)
Debt Securities, Available-for-sale, Unrealized Loss Position	66,886	102,262
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(752)	(6,898)
Mortgage-backed Securities, Issued by Private Enterprises
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	10,204
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(508)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	20,813	16,623
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,313)	(1,568)
Debt Securities, Available-for-sale, Unrealized Loss Position	20,813	26,827
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(1,313)	(2,076)
Asset-backed Securities [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	22,413
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(1,155)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	19,952	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(289)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	19,952	22,413
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(289)	(1,155)
SBA asset-backed securities [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	17,250
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(1,274)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	13,739	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(903)	0
Debt Securities, Available-for-sale, Unrealized Loss Position	13,739	17,250
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (903)	$ (1,274)