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Loans and Credit Quality - Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment $ 30,866 $ 23,979  
Impaired loan, no related allowance, unpaid principal balance 31,917 25,135  
Impaired loan, related allowance, recorded investment 848 7,988  
Impaired loan, related allowance, unpaid principal balance 1,352 7,988  
Related allowance 14 966  
Recorded investment 31,714 31,967  
Unpaid principal balance 33,269 33,123  
Impaired loan, no related allowance, average recorded investment 32,258 28,351  
Impaired loan, no related allowance, interest income on accrual method 827 976  
Impaired loan, related allowance, average recorded investment 2,431 8,544  
Impaired loan, related allowance, interest income on accrual method 20 7  
Impaired loan, average recorded investment 34,689 36,895 $ 42,600
Impaired loan, interest income on accrual method 847 983 $ 2,400
Commercial | Asset Quality Rating - Pass      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 80    
Impaired loan, no related allowance, unpaid principal balance 80    
Related allowance 0    
Recorded investment 80    
Unpaid principal balance 80    
Impaired loan, no related allowance, average recorded investment 21 0  
Impaired loan, no related allowance, interest income on accrual method 2 0  
Impaired loan, average recorded investment 21 0  
Impaired loan, interest income on accrual method 2 0  
Commercial | Asset Quality Rating - Special Mention      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 2,009 2,153  
Impaired loan, no related allowance, unpaid principal balance 2,009 2,153  
Related allowance 0 0  
Recorded investment 2,009 2,153  
Unpaid principal balance 2,009 2,153  
Impaired loan, no related allowance, average recorded investment 2,146 582  
Impaired loan, no related allowance, interest income on accrual method 128 1  
Impaired loan, related allowance, average recorded investment 0 525  
Impaired loan, related allowance, interest income on accrual method 0 3  
Impaired loan, average recorded investment 2,146 1,107  
Impaired loan, interest income on accrual method 128 4  
Commercial | Asset Quality Rating - Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 21,252 16,671  
Impaired loan, no related allowance, unpaid principal balance 22,303 17,742  
Impaired loan, related allowance, recorded investment 848 7,988  
Impaired loan, related allowance, unpaid principal balance 1,352 7,988  
Related allowance 14 966  
Recorded investment 22,100 24,659  
Unpaid principal balance 23,655 25,730  
Impaired loan, no related allowance, average recorded investment 24,548 19,521  
Impaired loan, no related allowance, interest income on accrual method 381 487  
Impaired loan, related allowance, average recorded investment 2,323 8,019  
Impaired loan, related allowance, interest income on accrual method 20 4  
Impaired loan, average recorded investment 26,871 27,540  
Impaired loan, interest income on accrual method 401 491  
Commercial | Asset Quality Rating - Doubtful      
Financing Receivable, Impaired [Line Items]      
Impaired loan, related allowance, average recorded investment 14 0  
Impaired loan, related allowance, interest income on accrual method 0 0  
Impaired loan, average recorded investment 14 0  
Impaired loan, interest income on accrual method 0 0  
Real estate term owner occupied | Asset Quality Rating - Pass      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, average recorded investment 0 62  
Impaired loan, no related allowance, interest income on accrual method 0 5  
Impaired loan, average recorded investment 0 62  
Impaired loan, interest income on accrual method 0 5  
Real estate term owner occupied | Asset Quality Rating - Special Mention      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, average recorded investment 155 0  
Impaired loan, no related allowance, interest income on accrual method 0 0  
Impaired loan, average recorded investment 155 0  
Impaired loan, interest income on accrual method 0 0  
Real estate term owner occupied | Asset Quality Rating - Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 5,253 2,862  
Impaired loan, no related allowance, unpaid principal balance 5,253 2,862  
Related allowance 0 0  
Recorded investment 5,253 2,862  
Unpaid principal balance 5,253 2,862  
Impaired loan, no related allowance, average recorded investment 3,813 5,402  
Impaired loan, no related allowance, interest income on accrual method 201 286  
Impaired loan, average recorded investment 3,813 5,402  
Impaired loan, interest income on accrual method 201 286  
Real estate term non-owner occupied | Asset Quality Rating - Pass      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 295 303  
Impaired loan, no related allowance, unpaid principal balance 295 303  
Related allowance 0 0  
Recorded investment 295 303  
Unpaid principal balance 295 303  
Impaired loan, no related allowance, average recorded investment 265 354  
Impaired loan, no related allowance, interest income on accrual method 24 43  
Impaired loan, average recorded investment 265 354  
Impaired loan, interest income on accrual method 24 43  
Real estate term non-owner occupied | Asset Quality Rating - Special Mention      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment   89  
Impaired loan, no related allowance, unpaid principal balance   89  
Related allowance   0  
Recorded investment   89  
Unpaid principal balance   89  
Impaired loan, no related allowance, average recorded investment 22 23  
Impaired loan, no related allowance, interest income on accrual method 2 2  
Impaired loan, average recorded investment 22 23  
Impaired loan, interest income on accrual method 2 2  
Real estate term non-owner occupied | Asset Quality Rating - Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 465 482  
Impaired loan, no related allowance, unpaid principal balance 465 482  
Related allowance 0 0  
Recorded investment 465 482  
Unpaid principal balance 465 482  
Impaired loan, no related allowance, average recorded investment 381 611  
Impaired loan, no related allowance, interest income on accrual method 30 45  
Impaired loan, average recorded investment 381 611  
Impaired loan, interest income on accrual method 30 45  
Real estate term other | Asset Quality Rating - Pass      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 486 559  
Impaired loan, no related allowance, unpaid principal balance 486 559  
Related allowance 0 0  
Recorded investment 486 559  
Unpaid principal balance 486 559  
Impaired loan, no related allowance, average recorded investment 421 595  
Impaired loan, no related allowance, interest income on accrual method 36 42  
Impaired loan, average recorded investment 421 595  
Impaired loan, interest income on accrual method 36 42  
Real estate term other | Asset Quality Rating - Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 577    
Impaired loan, no related allowance, unpaid principal balance 577    
Related allowance 0    
Recorded investment 577    
Unpaid principal balance 577    
Impaired loan, no related allowance, average recorded investment 176 487  
Impaired loan, no related allowance, interest income on accrual method 0 34  
Impaired loan, average recorded investment 176 487  
Impaired loan, interest income on accrual method 0 34  
Consumer secured by 1st deeds of trust | Asset Quality Rating - Pass      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 129 136  
Impaired loan, no related allowance, unpaid principal balance 129 136  
Related allowance 0 0  
Recorded investment 129 136  
Unpaid principal balance 129 136  
Impaired loan, no related allowance, average recorded investment 135 35  
Impaired loan, no related allowance, interest income on accrual method 13 3  
Impaired loan, average recorded investment 135 35  
Impaired loan, interest income on accrual method 13 3  
Consumer secured by 1st deeds of trust | Asset Quality Rating - Special Mention      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, average recorded investment 0 105  
Impaired loan, no related allowance, interest income on accrual method 0 10  
Impaired loan, average recorded investment 0 105  
Impaired loan, interest income on accrual method 0 10  
Consumer secured by 1st deeds of trust | Asset Quality Rating - Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 320 724  
Impaired loan, no related allowance, unpaid principal balance 320 809  
Related allowance 0 0  
Recorded investment 320 724  
Unpaid principal balance 320 809  
Impaired loan, no related allowance, average recorded investment 175 561  
Impaired loan, no related allowance, interest income on accrual method 10 17  
Impaired loan, related allowance, average recorded investment 94 0  
Impaired loan, related allowance, interest income on accrual method 0 0  
Impaired loan, average recorded investment 269 561  
Impaired loan, interest income on accrual method 10 17  
Consumer other | Asset Quality Rating - Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, average recorded investment 0 13  
Impaired loan, no related allowance, interest income on accrual method 0 1  
Impaired loan, average recorded investment 0 13  
Impaired loan, interest income on accrual method $ 0 $ 1