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Loans, Allowance for Credit Losses, and Asset Quality Information - Unfunded Loan Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 65,022	$ 42,342	$ 52,388	$ 21,398	$ 21,398
Charge-offs	(1,105)	(668)	(5,553)	(6,441)	(8,502)
Recoveries	1,111	1,432	3,618	3,261	4,453
Provisions/(Reversals)	(1,400)	6,120	(1,400)	31,008	35,039
Ending balance	63,628	$ 49,226	63,628	$ 49,226	52,388
Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			14,575
Ending balance					14,575
Unfunded Loan Commitment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			582
Charge-offs			0
Recoveries			0
Provisions/(Reversals)			2,988
Ending balance	$ 11,074		11,074		582
Unfunded Loan Commitment | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			$ 7,504
Ending balance					$ 7,504

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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