Investment Securities - Schedule of Gross Unrealized Losses on Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	$ 973,186	$ 928,115
Unrealized Loss, Less than 12 months	(139,240)	(14,703)
Fair Value, 12 months or more	503,442	102,799
Unrealized Loss, 12 months or more	(119,474)	(3,690)
Fair Value, Total	1,476,628	1,030,914
Unrealized Loss, Total	(258,714)	(18,393)
U.S. government agency securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	33,269	18,360
Unrealized Loss, Less than 12 months	(4,207)	(171)
Fair Value, 12 months or more	6,562	0
Unrealized Loss, 12 months or more	(1,123)	0
Fair Value, Total	39,831	18,360
Unrealized Loss, Total	(5,330)	(171)
Mortgage-backed securities - residential
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	570,554	871,368
Unrealized Loss, Less than 12 months	(84,615)	(14,295)
Fair Value, 12 months or more	487,209	102,799
Unrealized Loss, 12 months or more	(115,143)	(3,690)
Fair Value, Total	1,057,763	974,167
Unrealized Loss, Total	(199,758)	(17,985)
Mortgage-backed securities - commercial
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	16,709	7,946
Unrealized Loss, Less than 12 months	(1,354)	(46)
Fair Value, 12 months or more	1,138	0
Unrealized Loss, 12 months or more	(252)	0
Fair Value, Total	17,847	7,946
Unrealized Loss, Total	(1,606)	(46)
Municipal securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	238,067	11,414
Unrealized Loss, Less than 12 months	(42,452)	(160)
Fair Value, 12 months or more	8,533	0
Unrealized Loss, 12 months or more	(2,956)	0
Fair Value, Total	246,600	11,414
Unrealized Loss, Total	(45,408)	(160)
U.S. Treasury securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	107,297	14,908
Unrealized Loss, Less than 12 months	(5,901)	(6)
Fair Value, 12 months or more	0	0
Unrealized Loss, 12 months or more	0	0
Fair Value, Total	107,297	14,908
Unrealized Loss, Total	(5,901)	(6)
Corporate securities
Debt Securities, Available-for-sale [Abstract]
Fair Value, Less than 12 months	7,290	4,119
Unrealized Loss, Less than 12 months	(711)	(25)
Fair Value, 12 months or more	0	0
Unrealized Loss, 12 months or more	0	0
Fair Value, Total	7,290	4,119
Unrealized Loss, Total	$ (711)	$ (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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