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Loans Receivable - Average Recorded Investment of Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Related Specific Valuation Allowance   $ 2,143  
Average recorded investment of impaired loans   47,164 $ 39,489
Nonaccrual      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Interest income recognized $ 639 595  
Commercial business      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Related Specific Valuation Allowance   1,944  
Average recorded investment of impaired loans   45,664 37,549
Commercial business | Nonaccrual      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Interest income recognized 590 556  
Commercial business | Commercial and industrial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Related Specific Valuation Allowance   1,372  
Average recorded investment of impaired loans   31,905 16,773
Commercial business | Commercial and industrial | Nonaccrual      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Interest income recognized 434 147  
Commercial business | Owner-occupied CRE      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Related Specific Valuation Allowance   426  
Average recorded investment of impaired loans   6,008 11,313
Commercial business | Owner-occupied CRE | Nonaccrual      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Interest income recognized 89 228  
Commercial business | Non-owner occupied CRE      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Related Specific Valuation Allowance   146  
Average recorded investment of impaired loans   7,751 9,463
Commercial business | Non-owner occupied CRE | Nonaccrual      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Interest income recognized 67 181  
Residential real estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Related Specific Valuation Allowance   56  
Average recorded investment of impaired loans   242 290
Residential real estate | Nonaccrual      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Interest income recognized 2 0  
Real estate construction and land development      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Average recorded investment of impaired loans   682 1,220
Real estate construction and land development | Nonaccrual      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Interest income recognized 0 33  
Real estate construction and land development | Residential      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Related Specific Valuation Allowance   0  
Average recorded investment of impaired loans   682 1,091
Real estate construction and land development | Residential | Nonaccrual      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Interest income recognized 0 33  
Real estate construction and land development | Commercial and multifamily      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Average recorded investment of impaired loans   0 129
Real estate construction and land development | Commercial and multifamily | Nonaccrual      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Interest income recognized 0 0  
Consumer      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Related Specific Valuation Allowance   143  
Average recorded investment of impaired loans   576 $ 430
Consumer | Nonaccrual      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Interest income recognized $ 47 $ 6