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Loans and Credit Quality - Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment $ 24,112 $ 30,866  
Impaired loan, no related allowance, unpaid principal balance 24,185 31,917  
Impaired loan, related allowance, recorded investment 561 848  
Impaired loan, related allowance, unpaid principal balance 561 1,352  
Related allowance 17 14  
Recorded investment 24,673 31,714  
Unpaid principal balance 24,746 33,269  
Impaired loan, no related allowance, average recorded investment 27,477 32,258  
Impaired loan, no related allowance, interest income on accrual method 623 827  
Impaired loan, related allowance, average recorded investment 918 2,431  
Impaired loan, related allowance, interest income on accrual method 0 20  
Impaired loan, average recorded investment 28,395 34,689 $ 36,900
Impaired loan, interest income on accrual method 623 847 $ 983
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 532 21  
Impaired loan, no related allowance, interest income on accrual method 35 2  
Impaired loan, average recorded investment 532 21  
Impaired loan, interest income on accrual method 35 2  
Commercial | Asset Quality Rating - Special Mention      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment   2,009  
Impaired loan, no related allowance, unpaid principal balance   2,009  
Related allowance   0  
Recorded investment   2,009  
Unpaid principal balance   2,009  
Impaired loan, no related allowance, average recorded investment 0 2,146  
Impaired loan, no related allowance, interest income on accrual method 0 128  
Impaired loan, average recorded investment 0 2,146  
Impaired loan, interest income on accrual method 0 128  
Commercial | Asset Quality Rating - Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 15,517 21,252  
Impaired loan, no related allowance, unpaid principal balance 15,582 22,303  
Impaired loan, related allowance, recorded investment 561 848  
Impaired loan, related allowance, unpaid principal balance 561 1,352  
Related allowance 17 14  
Recorded investment 16,078 22,100  
Unpaid principal balance 16,143 23,655  
Impaired loan, no related allowance, average recorded investment 16,892 24,548  
Impaired loan, no related allowance, interest income on accrual method 405 381  
Impaired loan, related allowance, average recorded investment 683 2,323  
Impaired loan, related allowance, interest income on accrual method 0 20  
Impaired loan, average recorded investment 17,575 26,871  
Impaired loan, interest income on accrual method 405 401  
Commercial | Asset Quality Rating - Doubtful      
Financing Receivable, Impaired [Line Items]      
Impaired loan, related allowance, average recorded investment 0 14  
Impaired loan, related allowance, interest income on accrual method 0 0  
Impaired loan, average recorded investment 0 14  
Impaired loan, interest income on accrual method 0 0  
Real estate construction one-to-four family | Asset Quality Rating - Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 1,349    
Impaired loan, no related allowance, unpaid principal balance 1,349    
Related allowance 0    
Recorded investment 1,349    
Unpaid principal balance 1,349    
Impaired loan, no related allowance, average recorded investment 1,933 0  
Impaired loan, no related allowance, interest income on accrual method 0 0  
Impaired loan, average recorded investment 1,933 0  
Impaired loan, interest income on accrual method 0 0  
Real estate term owner occupied | Asset Quality Rating - Special Mention      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, average recorded investment 0 155  
Impaired loan, no related allowance, interest income on accrual method 0 0  
Impaired loan, average recorded investment 0 155  
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 5,104 5,253  
Impaired loan, no related allowance, unpaid principal balance 5,104 5,253  
Related allowance 0 0  
Recorded investment 5,104 5,253  
Unpaid principal balance 5,104 5,253  
Impaired loan, no related allowance, average recorded investment 5,747 3,813  
Impaired loan, no related allowance, interest income on accrual method 113 201  
Impaired loan, average recorded investment 5,747 3,813  
Impaired loan, interest income on accrual method 113 201  
Real estate term non-owner occupied | Asset Quality Rating - Pass      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 178 295  
Impaired loan, no related allowance, unpaid principal balance 178 295  
Related allowance 0 0  
Recorded investment 178 295  
Unpaid principal balance 178 295  
Impaired loan, no related allowance, average recorded investment 251 265  
Impaired loan, no related allowance, interest income on accrual method 19 24  
Impaired loan, average recorded investment 251 265  
Impaired loan, interest income on accrual method 19 24  
Real estate term non-owner occupied | Asset Quality Rating - Special Mention      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, average recorded investment 0 22  
Impaired loan, no related allowance, interest income on accrual method 0 2  
Impaired loan, average recorded investment 0 22  
Impaired loan, interest income on accrual method 0 2  
Real estate term non-owner occupied | Asset Quality Rating - Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment   465  
Impaired loan, no related allowance, unpaid principal balance   465  
Related allowance   0  
Recorded investment   465  
Unpaid principal balance   465  
Impaired loan, no related allowance, average recorded investment 230 381  
Impaired loan, no related allowance, interest income on accrual method 0 30  
Impaired loan, average recorded investment 230 381  
Impaired loan, interest income on accrual method 0 30  
Real estate term other | Asset Quality Rating - Pass      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 417 486  
Impaired loan, no related allowance, unpaid principal balance 417 486  
Related allowance 0 0  
Recorded investment 417 486  
Unpaid principal balance 417 486  
Impaired loan, no related allowance, average recorded investment 448 421  
Impaired loan, no related allowance, interest income on accrual method 31 36  
Impaired loan, average recorded investment 448 421  
Impaired loan, interest income on accrual method 31 36  
Real estate term other | Asset Quality Rating - Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 1,176 577  
Impaired loan, no related allowance, unpaid principal balance 1,176 577  
Related allowance 0 0  
Recorded investment 1,176 577  
Unpaid principal balance 1,176 577  
Impaired loan, no related allowance, average recorded investment 1,046 176  
Impaired loan, no related allowance, interest income on accrual method 0 0  
Impaired loan, related allowance, average recorded investment 163 0  
Impaired loan, related allowance, interest income on accrual method 0 0  
Impaired loan, average recorded investment 1,209 176  
Impaired loan, interest income on accrual method 0 0  
Consumer secured by 1st deeds of trust | Asset Quality Rating - Pass      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 122 129  
Impaired loan, no related allowance, unpaid principal balance 122 129  
Related allowance 0 0  
Recorded investment 122 129  
Unpaid principal balance 122 129  
Impaired loan, no related allowance, average recorded investment 126 135  
Impaired loan, no related allowance, interest income on accrual method 13 13  
Impaired loan, average recorded investment 126 135  
Impaired loan, interest income on accrual method 13 13  
Consumer secured by 1st deeds of trust | Asset Quality Rating - Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 159 320  
Impaired loan, no related allowance, unpaid principal balance 163 320  
Related allowance 0 0  
Recorded investment 159 320  
Unpaid principal balance 163 320  
Impaired loan, no related allowance, average recorded investment 202 175  
Impaired loan, no related allowance, interest income on accrual method 7 10  
Impaired loan, related allowance, average recorded investment 72 94  
Impaired loan, related allowance, interest income on accrual method 0 0  
Impaired loan, average recorded investment 274 269  
Impaired loan, interest income on accrual method 7 10  
Consumer other | Asset Quality Rating - Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 90    
Impaired loan, no related allowance, unpaid principal balance 94    
Related allowance 0    
Recorded investment 90    
Unpaid principal balance 94    
Impaired loan, no related allowance, average recorded investment 70 0  
Impaired loan, no related allowance, interest income on accrual method 0 0  
Impaired loan, average recorded investment 70 0  
Impaired loan, interest income on accrual method $ 0 $ 0