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Investment Securities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Federal Reserve and Federal Home Loan Bank stock	$ 29,026		$ 34,153
Transfer to real estate owned	922,795	$ 0
Unrealized gain (loss)	66,200
Realized gain recognized at time of transfer	0
Accrued interest on HTM securities	4,100
AFS Allowance for credit losses	18		620
HTM Allowance for credit losses	$ 817		$ 0
Debt securities as percentage of total investment securities	(100.00%)
Debt securities weighted average duration	4 years 10 months 24 days
Gross realized losses on sales of investment	$ 25
Net loss (gain) on sale of investment securities	25	(221)
Proceeds from sale/call	$ 6,225	28,505
Holdings of securities of any one issuer	10.00%		10.00%
Payments to Acquire Held-to-maturity Securities	$ 237,036	$ 0
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Transfer to real estate owned	1,100,000
AFS Allowance for credit losses	0		$ 0
HTM Allowance for credit losses	0
Payments to Acquire Held-to-maturity Securities	237,000
Other Assets
Debt Securities, Available-for-sale [Line Items]
Accrued interest on available for sale securities	4,500		6,000
Collateral Pledged
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, restricted	$ 251,000		$ 261,000

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