Investment Securities - Number, Fair Value and Gross Unrealized Losses (Details) $ in Thousands	Dec. 31, 2022 USD ($) investment_security	Dec. 31, 2021 USD ($) investment_security
Less than 12 months
Number \| investment_security	102	204
Fair Value	$ 1,056,578	$ 2,302,658
Gross Unrealized Losses	$ (62,647)	$ (35,173)
12 months or Longer
Number \| investment_security	165	51
Fair Value	$ 1,544,392	$ 477,926
Gross Unrealized Losses	$ (241,085)	$ (15,784)
Total
Number \| investment_security	267	255
Fair Value	$ 2,600,970	$ 2,780,584
Gross Unrealized Losses	$ (303,732)	$ (50,957)
US Treasury Securities [Member]
Less than 12 months
Number \| investment_security	5	3
Fair Value	$ 33,982	$ 47,235
Gross Unrealized Losses	$ (237)	$ (456)
12 months or Longer
Number \| investment_security	1	0
Fair Value	$ 13,036	$ 0
Gross Unrealized Losses	$ (1,902)	$ 0
Total
Number \| investment_security	6	3
Fair Value	$ 47,018	$ 47,235
Gross Unrealized Losses	$ (2,139)	$ (456)
Agency
Less than 12 months
Number \| investment_security	8	19
Fair Value	$ 79,895	$ 278,078
Gross Unrealized Losses	$ (1,265)	$ (5,634)
12 months or Longer
Number \| investment_security	35	16
Fair Value	$ 351,543	$ 119,750
Gross Unrealized Losses	$ (52,628)	$ (4,495)
Total
Number \| investment_security	43	35
Fair Value	$ 431,438	$ 397,828
Gross Unrealized Losses	$ (53,893)	$ (10,129)
Corporate
Less than 12 months
Number \| investment_security	35	17
Fair Value	$ 327,984	$ 166,563
Gross Unrealized Losses	$ (20,840)	$ (849)
12 months or Longer
Number \| investment_security	21	3
Fair Value	$ 214,565	$ 57,274
Gross Unrealized Losses	$ (23,264)	$ (3,007)
Total
Number \| investment_security	56	20
Fair Value	$ 542,549	$ 223,837
Gross Unrealized Losses	$ (44,104)	$ (3,856)
Municipal bonds
Less than 12 months
Number \| investment_security		36
Fair Value		$ 277,564
Gross Unrealized Losses		$ (4,079)
12 months or Longer
Number \| investment_security		2
Fair Value		$ 6,596
Gross Unrealized Losses		$ (202)
Total
Number \| investment_security		38
Fair Value		$ 284,160
Gross Unrealized Losses		$ (4,281)
Collateralized mortgage obligations
Less than 12 months
Number \| investment_security	41	26
Fair Value	$ 522,955	$ 226,763
Gross Unrealized Losses	$ (33,318)	$ (3,738)
12 months or Longer
Number \| investment_security	40	15
Fair Value	$ 241,229	$ 121,185
Gross Unrealized Losses	$ (32,381)	$ (2,317)
Total
Number \| investment_security	81	41
Fair Value	$ 764,184	$ 347,948
Gross Unrealized Losses	$ (65,699)	$ (6,055)
Mortgage-backed securities
Less than 12 months
Number \| investment_security	13	103
Fair Value	$ 91,762	$ 1,306,455
Gross Unrealized Losses	$ (6,987)	$ (20,417)
12 months or Longer
Number \| investment_security	68	15
Fair Value	$ 724,019	$ 173,121
Gross Unrealized Losses	$ (130,910)	$ (5,763)
Total
Number \| investment_security	81	118
Fair Value	$ 815,781	$ 1,479,576
Gross Unrealized Losses	$ (137,897)	$ (26,180)

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

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

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