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Debt Securities Available for Sale - Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,443,701	$ 1,515,941
Gross Unrealized Gains	179	141
Gross Unrealized (Losses)	(171,310)	(187,448)
Allowance for Credit Losses	0	0	$ (1,144)	$ 0
Debt securities available for sale	1,272,570	1,328,634
U.S. government and agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,432	67,771
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(1,793)	(4,205)
Debt securities available for sale	21,639	63,566
Mortgage-backed securities and collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,324,035	1,351,929
Gross Unrealized Gains	179	135
Gross Unrealized (Losses)	(153,341)	(170,337)
Debt securities available for sale	1,170,873	1,181,727
Municipal obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,695	3,697
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(147)	(122)
Debt securities available for sale	3,548	3,575
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	92,539	92,544
Gross Unrealized Gains	0	6
Gross Unrealized (Losses)	(16,029)	(12,784)
Debt securities available for sale	$ 76,510	$ 79,766