Investment Securities - Number, Fair Value and Gross Unrealized Losses (Details) $ in Thousands	Dec. 31, 2021 USD ($) investment_security	Dec. 31, 2020 USD ($) investment_security
Less than 12 months
Number \| investment_security	204	106
Fair Value	$ 2,302,658	$ 812,988
Gross Unrealized Losses	$ (35,173)	$ (5,319)
12 months or Longer
Number \| investment_security	51	10
Fair Value	$ 477,926	$ 10,865
Gross Unrealized Losses	$ (15,784)	$ (303)
Total
Number \| investment_security	255	116
Fair Value	$ 2,780,584	$ 823,853
Gross Unrealized Losses	$ (50,957)	$ (5,622)
U.S. Treasury
Less than 12 months
Number \| investment_security	3
Fair Value	$ 47,235
Gross Unrealized Losses	$ (456)
12 months or Longer
Number \| investment_security	0
Fair Value	$ 0
Gross Unrealized Losses	$ 0
Total
Number \| investment_security	3
Fair Value	$ 47,235
Gross Unrealized Losses	$ (456)
Agency
Less than 12 months
Number \| investment_security	19	4
Fair Value	$ 278,078	$ 74,194
Gross Unrealized Losses	$ (5,634)	$ (307)
12 months or Longer
Number \| investment_security	16	9
Fair Value	$ 119,750	$ 10,434
Gross Unrealized Losses	$ (4,495)	$ (301)
Total
Number \| investment_security	35	13
Fair Value	$ 397,828	$ 84,628
Gross Unrealized Losses	$ (10,129)	$ (608)
Corporate
Less than 12 months
Number \| investment_security	17	9
Fair Value	$ 166,563	$ 71,226
Gross Unrealized Losses	$ (849)	$ (506)
12 months or Longer
Number \| investment_security	3	0
Fair Value	$ 57,274	$ 0
Gross Unrealized Losses	$ (3,007)	$ 0
Total
Number \| investment_security	20	9
Fair Value	$ 223,837	$ 71,226
Gross Unrealized Losses	$ (3,856)	$ (506)
Municipal bonds
Less than 12 months
Number \| investment_security	36	56
Fair Value	$ 277,564	$ 312,894
Gross Unrealized Losses	$ (4,079)	$ (3,253)
12 months or Longer
Number \| investment_security	2	0
Fair Value	$ 6,596	$ 0
Gross Unrealized Losses	$ (202)	$ 0
Total
Number \| investment_security	38	56
Fair Value	$ 284,160	$ 312,894
Gross Unrealized Losses	$ (4,281)	$ (3,253)
Collateralized mortgage obligations
Less than 12 months
Number \| investment_security	26	21
Fair Value	$ 226,763	$ 215,603
Gross Unrealized Losses	$ (3,738)	$ (710)
12 months or Longer
Number \| investment_security	15	1
Fair Value	$ 121,185	$ 431
Gross Unrealized Losses	$ (2,317)	$ (2)
Total
Number \| investment_security	41	22
Fair Value	$ 347,948	$ 216,034
Gross Unrealized Losses	$ (6,055)	$ (712)
Mortgage-backed securities
Less than 12 months
Number \| investment_security	103	16
Fair Value	$ 1,306,455	$ 139,071
Gross Unrealized Losses	$ (20,417)	$ (543)
12 months or Longer
Number \| investment_security	15	0
Fair Value	$ 173,121	$ 0
Gross Unrealized Losses	$ (5,763)	$ 0
Total
Number \| investment_security	118	16
Fair Value	$ 1,479,576	$ 139,071
Gross Unrealized Losses	$ (26,180)	$ (543)

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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