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Allowance for Credit Losses - Unfunded Loan Commitments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Allowance for loan losses:
Beginning balance	$ 946
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Provision for credit losses on unfunded loan commitments (included in other noninterest expense)	$ 9,200
Ending balance	20,535
Cumulative Effect, Period of Adoption, Adjustment
Allowance for loan losses:
Beginning balance	$ 10,389

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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