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Loans and Credit Quality - Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment $ 26,084   $ 29,435
Impaired loan, no related allowance, unpaid principal balance 26,780   30,131
Impaired loan, related allowance, recorded investment 11,234   9,221
Impaired loan, related allowance, unpaid principal balance 11,234   9,221
Related allowance 994   614
Recorded investment 37,318   38,656
Unpaid principal balance 38,014   39,352
Impaired loan, no related allowance, average recorded investment 26,187 $ 41,661  
Impaired loan, no related allowance, interest income recognized 229 487  
Impaired loan, related allowance, average recorded investment 11,285 594  
Impaired loan, related allowance, interest income recognized 0 0  
Impaired loan, average recorded investment 37,472 42,255  
Impaired loan, interest income recognized 229 487  
Commercial | AQR Special Mention      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 51   223
Impaired loan, no related allowance, unpaid principal balance 51   223
Related allowance 0   0
Recorded investment 51   223
Unpaid principal balance 51   223
Impaired loan, no related allowance, average recorded investment 52 155  
Impaired loan, no related allowance, interest income recognized 1 3  
Impaired loan, average recorded investment 52 155  
Impaired loan, interest income recognized 1 3  
Commercial | AQR Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 17,478   9,213
Impaired loan, no related allowance, unpaid principal balance 18,158   9,893
Impaired loan, related allowance, recorded investment 11,234   9,221
Impaired loan, related allowance, unpaid principal balance 11,234   9,221
Related allowance 994   614
Recorded investment 28,712   18,434
Unpaid principal balance 29,392   19,114
Impaired loan, no related allowance, average recorded investment 17,544 16,589  
Impaired loan, no related allowance, interest income recognized 76 197  
Impaired loan, related allowance, average recorded investment 11,285 594  
Impaired loan, related allowance, interest income recognized 0 0  
Impaired loan, average recorded investment 28,829 17,183  
Impaired loan, interest income recognized 76 197  
Real estate construction one-to-four family | AQR Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, average recorded investment 0 3,972  
Impaired loan, no related allowance, interest income recognized 0 0  
Impaired loan, average recorded investment 0 3,972  
Impaired loan, interest income recognized 0 0  
Real estate construction other | AQR Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, average recorded investment 0 1,912  
Impaired loan, no related allowance, interest income recognized 0 0  
Impaired loan, average recorded investment 0 1,912  
Impaired loan, interest income recognized 0 0  
Real estate term owner occupied | AQR Pass      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 249   252
Impaired loan, no related allowance, unpaid principal balance 249   252
Related allowance 0   0
Recorded investment 249   252
Unpaid principal balance 249   252
Impaired loan, no related allowance, average recorded investment 250 749  
Impaired loan, no related allowance, interest income recognized 5 14  
Impaired loan, average recorded investment 250 749  
Impaired loan, interest income recognized 5 14  
Real estate term owner occupied | AQR Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 5,311   16,694
Impaired loan, no related allowance, unpaid principal balance 5,311   16,694
Related allowance 0   0
Recorded investment 5,311   16,694
Unpaid principal balance 5,311   16,694
Impaired loan, no related allowance, average recorded investment 5,325 16,401  
Impaired loan, no related allowance, interest income recognized 84 236  
Impaired loan, average recorded investment 5,325 16,401  
Impaired loan, interest income recognized 84 236  
Real estate term non-owner occupied | AQR Pass      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 377   391
Impaired loan, no related allowance, unpaid principal balance 377   391
Related allowance 0   0
Recorded investment 377   391
Unpaid principal balance 377   391
Impaired loan, no related allowance, average recorded investment 384 470  
Impaired loan, no related allowance, interest income recognized 14 19  
Impaired loan, average recorded investment 384 470  
Impaired loan, interest income recognized 14 19  
Real estate term non-owner occupied | AQR Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 698   693
Impaired loan, no related allowance, unpaid principal balance 698   693
Related allowance 0   0
Recorded investment 698   693
Unpaid principal balance 698   693
Impaired loan, no related allowance, average recorded investment 696 237  
Impaired loan, no related allowance, interest income recognized 20 0  
Impaired loan, average recorded investment 696 237  
Impaired loan, interest income recognized 20 0  
Real estate term other | AQR Pass      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 614   633
Impaired loan, no related allowance, unpaid principal balance 614   633
Related allowance 0   0
Recorded investment 614   633
Unpaid principal balance 614   633
Impaired loan, no related allowance, average recorded investment 624 543  
Impaired loan, no related allowance, interest income recognized 11 12  
Impaired loan, average recorded investment 624 543  
Impaired loan, interest income recognized 11 12  
Real estate term other | AQR Special Mention      
Financing Receivable, Impaired [Line Items]      
Related allowance     0
Recorded investment     669
Unpaid principal balance     669
Impaired loan, no related allowance, average recorded investment 0 90  
Impaired loan, no related allowance, interest income recognized 0 2  
Impaired loan, average recorded investment 0 90  
Impaired loan, interest income recognized 0 2  
Real estate term other | AQR Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 658   669
Impaired loan, no related allowance, unpaid principal balance 658   669
Related allowance 0    
Recorded investment 658    
Unpaid principal balance 658    
Impaired loan, no related allowance, average recorded investment 663 0  
Impaired loan, no related allowance, interest income recognized 11 0  
Impaired loan, average recorded investment 663 0  
Impaired loan, interest income recognized 11 0  
Consumer secured by 1st deeds of trust | AQR Pass      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment     143
Impaired loan, no related allowance, unpaid principal balance     143
Related allowance     0
Recorded investment     143
Unpaid principal balance     143
Impaired loan, no related allowance, average recorded investment 0 76  
Impaired loan, no related allowance, interest income recognized 0 1  
Impaired loan, average recorded investment 0 76  
Impaired loan, interest income recognized 0 1  
Consumer secured by 1st deeds of trust | AQR Special Mention      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 141    
Impaired loan, no related allowance, unpaid principal balance 141    
Related allowance 0    
Recorded investment 141    
Unpaid principal balance 141    
Impaired loan, no related allowance, average recorded investment 142 0  
Impaired loan, no related allowance, interest income recognized 3 0  
Impaired loan, average recorded investment 142 0  
Impaired loan, interest income recognized 3 0  
Consumer secured by 1st deeds of trust | AQR Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 455   472
Impaired loan, no related allowance, unpaid principal balance 471   488
Related allowance 0   0
Recorded investment 455   472
Unpaid principal balance 471   488
Impaired loan, no related allowance, average recorded investment 455 467  
Impaired loan, no related allowance, interest income recognized 3 3  
Impaired loan, average recorded investment 455 467  
Impaired loan, interest income recognized 3 3  
Consumer other | AQR Substandard      
Financing Receivable, Impaired [Line Items]      
Impaired loan, no related allowance, recorded investment 52   52
Impaired loan, no related allowance, unpaid principal balance 52   52
Related allowance 0   0
Recorded investment 52   52
Unpaid principal balance 52   $ 52
Impaired loan, no related allowance, average recorded investment 52 0  
Impaired loan, no related allowance, interest income recognized 1 0  
Impaired loan, average recorded investment 52 0  
Impaired loan, interest income recognized $ 1 $ 0