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Investment Securities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Federal Reserve and Federal Home Loan Bank stock	$ 33,990			$ 33,990		$ 34,153
Transfer to real estate owned				922,795	$ 0
Payments to acquire held-to-maturity securities				283,890	0
Realized gain recognized at time of transfer				0
Accrued interest on HTM securities	3,700			3,700
AFS Allowance for credit losses	18			18		620
HTM Allowance for credit losses	$ (826)			$ (826)		$ 0
Debt securities as percentage of total investment securities	(100.00%)			(100.00%)
Debt securities weighted average duration				5 years 1 month 17 days
Net loss (gain) on sale of investment securities	$ (151)		$ (318)	$ (176)	539
Proceeds from sale/call				$ 6,225	$ 52,022
Holdings of securities of any one issuer	10.00%			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)		$ 66,200		$ 63,500
AFS Allowance for credit losses	$ 0			0		$ 0
HTM Allowance for credit losses	0			0
Other Assets
Debt Securities, Available-for-sale [Line Items]
Accrued interest on available for sale securities	4,400			4,400		6,000
Collateral Pledged
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, restricted	$ 244,700			$ 244,700		$ 261,000

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