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Loans and Allowance for Credit Losses for Loans - Pre-Modification and Post-Modification (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
contract
Mar. 31, 2020
USD ($)
contract
Troubled Debt Restructurings    
Number of contracts, troubled restructurings (in contract) | contract 14 17
Pre-Modification Amortized Carrying Amount $ 19,639 $ 17,007
Post-Modification Amortized Carrying Amount $ 19,178 $ 16,485
Days past due to place on non-accrual status 90 days 90 days
Number of contracts, troubled debt restructurings subsequently defaulted (in contract) | contract 19 1
Amortized Cost $ 13,039 $ 154
Commercial and industrial    
Troubled Debt Restructurings    
Number of contracts, troubled restructurings (in contract) | contract 5 16
Pre-Modification Amortized Carrying Amount $ 13,744 $ 13,144
Post-Modification Amortized Carrying Amount $ 13,307 $ 12,630
Number of contracts, troubled debt restructurings subsequently defaulted (in contract) | contract 16 0
Amortized Cost $ 12,384 $ 0
Commercial real estate | Commercial real estate    
Troubled Debt Restructurings    
Number of contracts, troubled restructurings (in contract) | contract 2 1
Pre-Modification Amortized Carrying Amount $ 4,197 $ 3,863
Post-Modification Amortized Carrying Amount $ 4,185 $ 3,855
Residential mortgage    
Troubled Debt Restructurings    
Number of contracts, troubled restructurings (in contract) | contract 6 0
Pre-Modification Amortized Carrying Amount $ 1,528 $ 0
Post-Modification Amortized Carrying Amount $ 1,518 $ 0
Number of contracts, troubled debt restructurings subsequently defaulted (in contract) | contract 3 1
Amortized Cost $ 655 $ 154
Consumer    
Troubled Debt Restructurings    
Number of contracts, troubled restructurings (in contract) | contract 1 0
Pre-Modification Amortized Carrying Amount $ 170 $ 0
Post-Modification Amortized Carrying Amount $ 168 $ 0