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Investment Securities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Federal Reserve and Federal Home Loan Bank stock	$ 79,134		$ 65,067
Payments to acquire held-to-maturity securities	0	$ 237,036
Realized gain recognized at time of transfer	0
Accrued interest on HTM securities	3,700		3,600
Allowance for credit losses for available-for-sale securities in the period	(14)
Allowance for credit losses for held-to-maturity securities in the period	(1,200)
AFS Allowance for credit losses	(31)		(17)
HTM Allowance for credit losses	$ 2,008		$ 766
Debt securities as percentage of total investment securities	(100.00%)
Debt securities weighted average duration	4 years 8 months 26 days
Debt securities, available-for-sale, realized gain	$ 5	0
Debt securities, available-for-sale, realized loss	(26)	(25)
Gross proceeds from sales and calls	$ 8,400	6,200
Holdings of securities of any one issuer	10.00%		10.00%
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Transfer to real estate owned		1,100,000
Payments to acquire held-to-maturity securities		237,000
Unrealized gain (loss)	$ 57,100	$ 66,200
AFS Allowance for credit losses	0		$ 0
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
AFS Allowance for credit losses	0		0
HTM Allowance for credit losses	(16)
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
AFS Allowance for credit losses	(31)		(17)
HTM Allowance for credit losses	(2,000)
Other Assets
Debt Securities, Available-for-sale [Line Items]
Accrued interest on available for sale securities	4,200		4,300
Collateral Pledged
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, restricted	$ 1,600,000		$ 220,100

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Real Estate Owned, Realized Gain (Loss) on Transfer to Real Estate Owned

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