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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance $ 23,734 $ 29,030 $ 24,460 $ 29,030
Provision for loan losses 71 (1,159) (727) (937)
Recoveries of loans previously charged-off 199 1,429 1,177 1,982
Loans charged off (714) (2,106) (1,620) (2,881)
Ending balance 23,290 27,194 23,290 27,194
Commercial and Industrial        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance 6,051 5,422 5,288 6,600
Provision for loan losses 423 791 912 (276)
Recoveries of loans previously charged-off 8 21 480 53
Loans charged off (358) (104) (556) (247)
Ending balance 6,124 6,130 6,124 6,130
Construction        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance 4,266 4,251 5,030 3,721
Provision for loan losses 103 (824) (764) (404)
Recoveries of loans previously charged-off 32 976 137 1,086
Loans charged off   (33) (2) (33)
Ending balance 4,401 4,370 4,401 4,370
Residential Real Estate | 1-to-4 Family Mortgage        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance 3,555 5,206 4,126 6,364
Provision for loan losses 108 45 (517) (985)
Recoveries of loans previously charged-off 2 92 109 127
Loans charged off (166) (376) (219) (539)
Ending balance 3,499 4,967 3,499 4,967
Residential Real Estate | Residential Line of Credit        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance 1,922 3,592 2,178 2,790
Provision for loan losses (99) 39 (387) 737
Recoveries of loans previously charged-off 36 147 143 251
Loans charged off (29) (104) (104) (104)
Ending balance 1,830 3,674 1,830 3,674
Residential Real Estate | Multi-Family Mortgage        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance 448 312 311 184
Provision for loan losses 165 (12) 302 116
Ending balance 613 300 613 300
Commercial Real Estate | Owner Occupied        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance 3,672 7,112 4,034 6,075
Provision for loan losses (35) (2,084) (315) (1,060)
Recoveries of loans previously charged-off 4 13 15 26
Loans charged off   (1,057) (93) (1,057)
Ending balance 3,641 3,984 3,641 3,984
Commercial Real Estate | Non-Owner Occupied        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance 2,752 2,294 2,610 2,641
Provision for loan losses (359) 576 (222) 226
Recoveries of loans previously charged-off 22 3 27 6
Loans charged off   (54)   (54)
Ending balance 2,415 2,819 2,415 2,819
Consumer and Other        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance 1,068 841 883 655
Provision for loan losses (235) 310 264 709
Recoveries of loans previously charged-off 95 177 266 433
Loans charged off (161) (378) (646) (847)
Ending balance $ 767 $ 950 $ 767 $ 950