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Purchased Loans - Narrative (Details)
2 Months Ended 3 Months Ended
Apr. 30, 2020
USD ($)
loan
Mar. 31, 2020
USD ($)
loan
Mar. 31, 2019
USD ($)
loan
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Loans and Allowance for Loan Losses (Textual) [Abstract]          
Allowance for loan losses attributable to restructured loans   $ 120,185,000 $ 49,835,000 $ 52,162,000 $ 49,026,000
Purchased loans          
Loans and Allowance for Loan Losses (Textual) [Abstract]          
Interest income   147,000      
Modifications with subsequent default   $ 0      
Number of restructured loans | loan   2 4    
Restructured loans discontinued past due period   90 days 90 days    
Remaining availability under commitments to lend additional funds on restructured loans   $ 7,000 $ 3,000    
Purchased loans | Subsequent Event          
Loans and Allowance for Loan Losses (Textual) [Abstract]          
Number of loan modifications | loan 600        
Modified loans, balance $ 415,000,000        
Purchased loans | Nonaccruing loans          
Loans and Allowance for Loan Losses (Textual) [Abstract]          
Outstanding balance of restructured loans   134,000 414,000    
Purchased loans | Restructured loans          
Loans and Allowance for Loan Losses (Textual) [Abstract]          
Outstanding balance of restructured loans   3,797,000 1,851,000    
Allowance for loan losses attributable to restructured loans   $ 56,000 $ 86,000