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Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at beginning of period $ 9,520 $ 9,689 $ 9,921 $ 9,623
Charge-offs (62) (219) (3,644) (490)
Recoveries 38 47 119 134
Provision (Credit) 250 200 3,350 450
Balance at end of period 9,746 9,717 9,746 9,717
Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at beginning of period 3,567 3,157 4,244 3,262
Charge-offs (14) 0 (3,353) (121)
Recoveries 4 8 11 14
Provision (Credit) 765 6 3,420 16
Balance at end of period 4,322 3,171 4,322 3,171
Commercial loans secured by real estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at beginning of period 3,706 4,087 3,449 3,902
Charge-offs 0 (15) 0 (15)
Recoveries 8 9 36 51
Provision (Credit) (440) 59 (211) 202
Balance at end of period 3,274 4,140 3,274 4,140
Real estate — mortgage [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at beginning of period 1,157 1,304 1,173 1,310
Charge-offs (8) (188) (46) (291)
Recoveries 20 25 62 55
Provision (Credit) (94) 180 (114) 247
Balance at end of period 1,075 1,321 1,075 1,321
Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at beginning of period 145 191 151 190
Charge-offs (40) (16) (245) (63)
Recoveries 6 5 10 14
Provision (Credit) 24 21 219 60
Balance at end of period 135 201 135 201
Allocation for general risk [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Balance at beginning of period 945 950 904 959
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision (Credit) (5) (66) 36 (75)
Balance at end of period $ 940 $ 884 $ 940 $ 884