Investment Securities - Schedule of Number, Fair Value and Gross Unrealized Losses (Details) $ in Thousands	Dec. 31, 2023 USD ($) investment_security	Dec. 31, 2022 USD ($) investment_security
Less than 12 months
Number \| investment_security	5	102
Fair Value	$ 103,611	$ 1,056,578
Gross Unrealized Losses	$ (27)	$ (62,647)
12 months or Longer
Number \| investment_security	79	165
Fair Value	$ 585,825	$ 1,544,392
Gross Unrealized Losses	$ (36,375)	$ (241,085)
Total
Number \| investment_security	84	267
Fair Value	$ 689,436	$ 2,600,970
Gross Unrealized Losses	$ (36,402)	$ (303,732)
U.S. Treasury
Less than 12 months
Number \| investment_security	4	5
Fair Value	$ 98,622	$ 33,982
Gross Unrealized Losses	$ (24)	$ (237)
12 months or Longer
Number \| investment_security	0	1
Fair Value	$ 0	$ 13,036
Gross Unrealized Losses	$ 0	$ (1,902)
Total
Number \| investment_security	4	6
Fair Value	$ 98,622	$ 47,018
Gross Unrealized Losses	$ (24)	$ (2,139)
Agency
Less than 12 months
Number \| investment_security	0	8
Fair Value	$ 0	$ 79,895
Gross Unrealized Losses	$ 0	$ (1,265)
12 months or Longer
Number \| investment_security	4	35
Fair Value	$ 1,868	$ 351,543
Gross Unrealized Losses	$ (73)	$ (52,628)
Total
Number \| investment_security	4	43
Fair Value	$ 1,868	$ 431,438
Gross Unrealized Losses	$ (73)	$ (53,893)
Corporate
Less than 12 months
Number \| investment_security	1	35
Fair Value	$ 4,989	$ 327,984
Gross Unrealized Losses	$ (3)	$ (20,840)
12 months or Longer
Number \| investment_security	47	21
Fair Value	$ 431,353	$ 214,565
Gross Unrealized Losses	$ (35,205)	$ (23,264)
Total
Number \| investment_security	48	56
Fair Value	$ 436,342	$ 542,549
Gross Unrealized Losses	$ (35,208)	$ (44,104)
Collateralized mortgage obligations
Less than 12 months
Number \| investment_security	0	41
Fair Value	$ 0	$ 522,955
Gross Unrealized Losses	$ 0	$ (33,318)
12 months or Longer
Number \| investment_security	28	40
Fair Value	$ 152,604	$ 241,229
Gross Unrealized Losses	$ (1,097)	$ (32,381)
Total
Number \| investment_security	28	81
Fair Value	$ 152,604	$ 764,184
Gross Unrealized Losses	$ (1,097)	$ (65,699)
Mortgage-backed securities
Less than 12 months
Number \| investment_security		13
Fair Value		$ 91,762
Gross Unrealized Losses		$ (6,987)
12 months or Longer
Number \| investment_security		68
Fair Value		$ 724,019
Gross Unrealized Losses		$ (130,910)
Total
Number \| investment_security		81
Fair Value		$ 815,781
Gross Unrealized Losses		$ (137,897)

Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions

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