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Loans and Allowance for Loan Losses Schedule of Allowance for Loan Loss Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Loans, Allowance for Credit Losses [Roll Forward]        
Allowance for loan losses, beginning balance $ 16,427 $ 15,280 $ 16,112 $ 14,967
Allowance for loan losses, charge-offs (133) (93) (193) (93)
Allowance for loan losses, recoveries 192 142 567 255
Provision for loan losses [1] 0 500 0 700
Allowance for loan losses, ending balance 16,486 15,829 16,486 15,829
Commercial loans [Member]        
Loans, Allowance for Credit Losses [Roll Forward]        
Allowance for loan losses, beginning balance 3,800 4,143 3,881 4,369
Allowance for loan losses, charge-offs (133) 0 (193) 0
Allowance for loan losses, recoveries 81 99 140 141
Provision for loan losses 54 199 (26) (69)
Allowance for loan losses, ending balance 3,802 4,441 3,802 4,441
Construction, land and land development [Member]        
Loans, Allowance for Credit Losses [Roll Forward]        
Allowance for loan losses, beginning balance 2,914 2,662 2,639 2,338
Allowance for loan losses, charge-offs 0 0 0 0
Allowance for loan losses, recoveries 95 12 398 56
Provision for loan losses (457) 130 (485) 410
Allowance for loan losses, ending balance 2,552 2,804 2,552 2,804
1-4 family residential first mortgages [Member]        
Loans, Allowance for Credit Losses [Roll Forward]        
Allowance for loan losses, beginning balance 315 396 317 508
Allowance for loan losses, charge-offs 0 (93) 0 (93)
Allowance for loan losses, recoveries 1 10 2 21
Provision for loan losses 34 80 31 (43)
Allowance for loan losses, ending balance 350 393 350 393
Home equity [Member]        
Loans, Allowance for Credit Losses [Roll Forward]        
Allowance for loan losses, beginning balance 447 519 478 481
Allowance for loan losses, charge-offs 0 0 0 0
Allowance for loan losses, recoveries 7 17 15 24
Provision for loan losses (82) (53) (121) (22)
Allowance for loan losses, ending balance 372 483 372 483
Commercial real estate [Member]        
Loans, Allowance for Credit Losses [Roll Forward]        
Allowance for loan losses, beginning balance 8,848 7,484 8,697 7,254
Allowance for loan losses, charge-offs 0 0 0 0
Allowance for loan losses, recoveries 3 3 6 6
Provision for loan losses 456 119 604 346
Allowance for loan losses, ending balance 9,307 7,606 9,307 7,606
Consumer and other loans [Member]        
Loans, Allowance for Credit Losses [Roll Forward]        
Allowance for loan losses, beginning balance 103 76 100 17
Allowance for loan losses, charge-offs 0 0 0 0
Allowance for loan losses, recoveries 5 1 6 7
Provision for loan losses (5) 25 (3) 78
Allowance for loan losses, ending balance $ 103 $ 102 $ 103 $ 102
[1] The negative provisions for the various segments are either related to the decline in outstanding balances in each of those portfolio segments during the time periods disclosed and/or improvement in the credit quality factors related to those portfolio segments.