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Recent Accounting Pronouncements Adopted (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	$ 37,607	$ 39,493	$ 43,197	$ 38,520	$ 36,800	$ 28,707
Unfounded credit commitment	808	$ 1,808	1,702
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Increase in allowance for credit losses	11,100
Allowance for credit loss	10,353
Unfounded credit commitment	737		$ 0
PCD loan related reserves	6,800
Non-PCD loan related reserves	$ 4,300

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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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