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Loans and Allowance for Credit Losses - Loans modified in troubled debt restructurings (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2021
contract
Mar. 31, 2021
loan
Mar. 31, 2020
USD ($)
Mar. 31, 2020
contract
Mar. 31, 2020
loan
Loans and Leases Receivable Disclosure [Line Items]            
Number of loans - restructured accruing   5 1   11 1
Number of loans - restructured nonaccruing | contract   3     2  
Number of TDR loans | contract   8     13  
Restructured accruing $ 10,328     $ 17,872    
Restructured nonaccruing 6,443     2,507    
Troubled debt restructured 16,771     20,379    
Specific allowance 3,523     1,007    
Restructured and subsequently defaulted 6,443     0    
Commercial            
Loans and Leases Receivable Disclosure [Line Items]            
Restructured accruing 1,157     1,438    
Restructured nonaccruing 101     137    
Troubled debt restructured 1,258     1,575    
Specific allowance 547     0    
Restructured and subsequently defaulted 101     0    
Income producing - commercial real estate            
Loans and Leases Receivable Disclosure [Line Items]            
Restructured accruing 9,171     15,574    
Restructured nonaccruing 6,342     0    
Troubled debt restructured 15,513     15,574    
Specific allowance 2,976     1,007    
Restructured and subsequently defaulted 6,342     0    
Owner occupied - commercial real estate            
Loans and Leases Receivable Disclosure [Line Items]            
Restructured accruing 0     860    
Restructured nonaccruing 0     2,370    
Troubled debt restructured 0     3,230    
Specific allowance 0     0    
Restructured and subsequently defaulted 0     0    
Construction Commercial Real Estate            
Loans and Leases Receivable Disclosure [Line Items]            
Restructured accruing 0     0    
Restructured nonaccruing 0     0    
Troubled debt restructured 0     0    
Specific allowance 0     0    
Restructured and subsequently defaulted $ 0     $ 0