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Debt Securities Available for Sale - Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,173,789		$ 1,515,941
Gross Unrealized Gains	47		141
Gross Unrealized (Losses)	(176,377)		(187,448)
Allowance for Credit Losses	0	$ 0	0	$ 0	$ (1,144)	$ 0
Debt securities available for sale	997,459		1,328,634
U.S. government and agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,445		67,771
Gross Unrealized Gains	0		0
Gross Unrealized (Losses)	(2,519)		(4,205)
Debt securities available for sale	20,926		63,566
Mortgage-backed securities and collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,054,116		1,351,929
Gross Unrealized Gains	42		135
Gross Unrealized (Losses)	(157,339)		(170,337)
Debt securities available for sale	896,819		1,181,727
Municipal obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,693		3,697
Gross Unrealized Gains	0		0
Gross Unrealized (Losses)	(107)		(122)
Debt securities available for sale	3,586		3,575
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	92,535		92,544
Gross Unrealized Gains	5		6
Gross Unrealized (Losses)	(16,412)		(12,784)
Debt securities available for sale	$ 76,128		$ 79,766