Loans, Allowance for Credit Losses, and Asset Quality Information - Unfunded Loan Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 65,849	$ 24,498	$ 52,388	$ 21,398	$ 21,398
Charge-offs	(2,131)	(2,460)	(4,448)	(5,773)	(8,502)
Recoveries	1,304	1,006	2,507	1,829	4,453
Provisions	0	19,298	0	24,888	35,039
Ending balance	65,022	$ 42,342	65,022	$ 42,342	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		600
Charge-offs	0
Recoveries	0
Provisions	1,939
Ending balance	10,025		$ 10,025		$ 600
Unfunded Loan Commitment | Cumulative Effect, Period Of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 7,504