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Allowance for Loan Losses - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2019
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]        
Reasonable and supportable period for estimating expected credit losses   2 years    
Straight line reversion period for estimating expected credit losses   12 months    
Allowance for loan losses $ 71,982 $ 74,010 $ 68,211 $ 81,238
Financing receivable, allowance for credit loss, period increase (decrease)   (7,200)    
Provision/(credit) for loan losses   7,004 $ (16,962)  
Reserve for unfunded loan commitments   4,500    
Off-balance sheet, credit loss, credit loss expense (reversal)   $ 2,000    
Adjustment        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Allowance for loan losses (20,385)      
Off-balance sheet, credit loss, credit loss expense (reversal) $ 1,400