Investment Securities - Schedule of Gross Unrealized Losses on Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	$ 1,257,882	$ 928,115
Unrealized Loss, Less than 12 months	(87,240)	(14,703)
Fair Value, 12 months or more	177,018	102,799
Unrealized Loss, 12 months or more	(17,925)	(3,690)
Fair Value, Total	1,434,900	1,030,914
Unrealized Loss, Total	(105,165)	(18,393)
U.S. government agency securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	38,882	18,360
Unrealized Loss, Less than 12 months	(2,133)	(171)
Fair Value, 12 months or more	0	0
Unrealized Loss, 12 months or more	0	0
Fair Value, Total	38,882	18,360
Unrealized Loss, Total	(2,133)	(171)
Mortgage-backed securities - residential
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	961,993	871,368
Unrealized Loss, Less than 12 months	(70,839)	(14,295)
Fair Value, 12 months or more	175,988	102,799
Unrealized Loss, 12 months or more	(17,726)	(3,690)
Fair Value, Total	1,137,981	974,167
Unrealized Loss, Total	(88,565)	(17,985)
Mortgage-backed securities - commercial
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	9,647	7,946
Unrealized Loss, Less than 12 months	(445)	(46)
Fair Value, 12 months or more	0	0
Unrealized Loss, 12 months or more	0	0
Fair Value, Total	9,647	7,946
Unrealized Loss, Total	(445)	(46)
Municipal securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	192,546	11,414
Unrealized Loss, Less than 12 months	(11,844)	(160)
Fair Value, 12 months or more	1,030	0
Unrealized Loss, 12 months or more	(199)	0
Fair Value, Total	193,576	11,414
Unrealized Loss, Total	(12,043)	(160)
U.S. Treasury securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	47,918	14,908
Unrealized Loss, Less than 12 months	(1,744)	(6)
Fair Value, 12 months or more	0	0
Unrealized Loss, 12 months or more	0	0
Fair Value, Total	47,918	14,908
Unrealized Loss, Total	(1,744)	(6)
Corporate securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	6,896	4,119
Unrealized Loss, Less than 12 months	(235)	(25)
Fair Value, 12 months or more	0	0
Unrealized Loss, 12 months or more	0	0
Fair Value, Total	6,896	4,119
Unrealized Loss, Total	$ (235)	$ (25)

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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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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 less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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