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Loans and Allowance for Loan Losses - Allowance for Loan Losses by Portfolio Segment and Related Investment in Loans Net of Unearned Interest (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance $ 22,898 $ 24,431 $ 21,747 $ 24,460
Provision for loan losses (865) (789) (1,122) (798)
Recoveries of loans previously charged-off 2,005 746 3,855 978
Loans charged off (791) (654) (1,233) (906)
Ending balance 23,247 23,734 23,247 23,734
Commercial and Industrial        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance 5,402 5,242 5,309 5,135
Provision for loan losses (1,342) 416 (1,163) 515
Recoveries of loans previously charged-off 1,511 462 1,594 472
Loans charged off (131) (196) (300) (198)
Ending balance 5,440 5,924 5,440 5,924
Construction        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance 5,598 4,518 4,940 5,143
Provision for loan losses (48) (207) 587 (873)
Recoveries of loans previously charged-off 29 64 58 105
Loans charged off   (2) (6) (2)
Ending balance 5,579 4,373 5,579 4,373
Residential Real Estate | 1-to-4 Family Mortgage        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance 2,896 4,280 3,197 4,176
Provision for loan losses 99 (661) (140) (619)
Recoveries of loans previously charged-off 14 45 40 107
Loans charged off (35) (53) (123) (53)
Ending balance 2,974 3,611 2,974 3,611
Residential Real Estate | Residential Line of Credit        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance 1,514 2,075 1,613 2,201
Provision for loan losses (29) (126) (184) (289)
Recoveries of loans previously charged-off 155 70 211 107
Loans charged off (195) (75) (195) (75)
Ending balance 1,445 1,944 1,445 1,944
Residential Real Estate | Multi-Family Mortgage        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance 508 590 504 311
Provision for loan losses 5 (137) 9 142
Ending balance 513 453 513 453
Commercial Real Estate | Owner Occupied        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance 3,387 4,013 3,302 3,682
Provision for loan losses 585 (161) 666 164
Recoveries of loans previously charged-off 11 5 15 11
Loans charged off   (93)   (93)
Ending balance 3,983 3,764 3,983 3,764
Commercial Real Estate | Non-Owner Occupied        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance 2,660 2,739 2,019 2,622
Provision for loan losses (210) (106) (1,208) 7
Recoveries of loans previously charged-off 2 1 1,641 5
Ending balance 2,452 2,634 2,452 2,634
Consumer and Other        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance 933 974 863 1,190
Provision for loan losses 75 193 311 155
Recoveries of loans previously charged-off 283 99 296 171
Loans charged off (430) (235) (609) (485)
Ending balance $ 861 $ 1,031 $ 861 $ 1,031