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Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance $ 14,999 $ 15,099 $ 14,224
Provision (reversal) (1,850) 500 750
Charge-offs (36) (864) (277)
Recoveries 2,329 264 402
Ending balance 15,442 14,999 15,099
Ending ALLL related to loans collectively evaluated for impairment 14,451 13,830  
Ending ALLL related to loans individually evaluated for impairment 991 1,160  
Ending ALLL 15,442 14,999  
Collectively evaluated for impairment 1,465,383 1,426,497  
Individually evaluated for impairment 18,313 21,050  
Total loans $ 1,486,616 $ 1,451,228  
Ratio of allowance for loan losses to total loans 1.04% 1.03%  
Allowance for loan losses to non-accrual loans 10650.00% 688.00%  
PCI loans impaired post-acquisition   $ 138  
Receivables Acquired with Deteriorated Credit Quality      
Allowance for Loan and Lease Losses [Roll Forward]      
Ending ALLL $ 0 9  
Purchased credit-impaired 2,920 3,681  
Commercial loans | Commercial and industrial      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 3,023 2,837 3,056
Provision (reversal) 93 (45) (321)
Charge-offs (11) (5) (66)
Recoveries 143 236 168
Ending balance   3,023 2,837
Ending ALLL related to loans collectively evaluated for impairment 2,963 2,111  
Ending ALLL related to loans individually evaluated for impairment 285 904  
Ending ALLL 3,248 3,023  
Collectively evaluated for impairment 216,368 214,695  
Individually evaluated for impairment 2,207 4,582  
Total loans $ 218,615 $ 219,452  
Ratio of allowance for loan losses to total loans 1.49% 1.38%  
Allowance for loan losses to non-accrual loans   14395.00%  
Commercial loans | Commercial and industrial | Receivables Acquired with Deteriorated Credit Quality      
Allowance for Loan and Lease Losses [Roll Forward]      
Ending ALLL $ 0 $ 8  
Purchased credit-impaired 40 175  
Commercial real estate loans | Commercial real estate, owner-occupied      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 2,249 1,924 2,012
Provision (reversal) (476) 325 (93)
Charge-offs (20) 0 0
Recoveries 0 0 5
Ending balance   2,249 1,924
Ending ALLL related to loans collectively evaluated for impairment 1,590 2,179  
Ending ALLL related to loans individually evaluated for impairment 163 70  
Ending ALLL 1,753 2,249  
Collectively evaluated for impairment 239,648 233,605  
Individually evaluated for impairment 6,993 6,993  
Total loans $ 247,713 $ 242,309  
Ratio of allowance for loan losses to total loans 0.71% 0.93%  
Commercial real estate loans | Commercial real estate, owner-occupied | Receivables Acquired with Deteriorated Credit Quality      
Allowance for Loan and Lease Losses [Roll Forward]      
Ending ALLL $ 0 $ 0  
Purchased credit-impaired 1,072 1,711  
Commercial real estate loans | Commercial real estate, investor      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 6,178 6,672 6,196
Provision (reversal) (2,014) (517) 431
Charge-offs 0 0 0
Recoveries 2,156 23 45
Ending balance   6,178 6,672
Ending ALLL related to loans collectively evaluated for impairment 5,945 6,178  
Ending ALLL related to loans individually evaluated for impairment 375 0  
Ending ALLL 6,320 6,178  
Collectively evaluated for impairment 720,266 711,737  
Individually evaluated for impairment 2,256 2,416  
Total loans $ 724,228 $ 715,879  
Ratio of allowance for loan losses to total loans 0.87% 0.86%  
Allowance for loan losses to non-accrual loans   325.00%  
Commercial real estate loans | Commercial real estate, investor | Receivables Acquired with Deteriorated Credit Quality      
Allowance for Loan and Lease Losses [Roll Forward]      
Ending ALLL $ 0 $ 0  
Purchased credit-impaired 1,706 1,726  
Commercial real estate loans | Construction      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 724 839 633
Provision (reversal) 57 724 314
Charge-offs 0 (839) (204)
Recoveries 0 0 96
Ending balance   724 839
Ending ALLL related to loans collectively evaluated for impairment 773 723  
Ending ALLL related to loans individually evaluated for impairment 8 0  
Ending ALLL 781 724  
Collectively evaluated for impairment 71,564 62,256  
Individually evaluated for impairment 3,245 3,238  
Total loans $ 74,809 $ 65,495  
Ratio of allowance for loan losses to total loans 1.04% 1.11%  
Allowance for loan losses to non-accrual loans   72400.00%  
Commercial real estate loans | Construction | Receivables Acquired with Deteriorated Credit Quality      
Allowance for Loan and Lease Losses [Roll Forward]      
Ending ALLL $ 0 $ 1  
Purchased credit-impaired 0 1  
Residential loans | Home equity      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 910 859 875
Provision (reversal) 60 48 (19)
Charge-offs 0 0 0
Recoveries 3 3 3
Ending balance   910 859
Ending ALLL related to loans collectively evaluated for impairment 966 907  
Ending ALLL related to loans individually evaluated for impairment 7 3  
Ending ALLL 973 910  
Collectively evaluated for impairment 116,390 111,673  
Individually evaluated for impairment 715 559  
Total loans $ 117,207 $ 112,300  
Ratio of allowance for loan losses to total loans 0.83% 0.81%  
Allowance for loan losses to non-accrual loans 1071.00% 532.00%  
Residential loans | Home equity | Receivables Acquired with Deteriorated Credit Quality      
Allowance for Loan and Lease Losses [Roll Forward]      
Ending ALLL $ 0 $ 0  
Purchased credit-impaired 102 68  
Residential loans | Other residential      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 394 433 317
Provision (reversal) 60 (39) 116
Charge-offs 0 0 0
Recoveries 0 0 0
Ending balance   394 433
Ending ALLL related to loans collectively evaluated for impairment 399 327  
Ending ALLL related to loans individually evaluated for impairment 55 67  
Ending ALLL 454 394  
Collectively evaluated for impairment 76,584 71,143  
Individually evaluated for impairment 1,965 2,011  
Total loans $ 78,549 $ 73,154  
Ratio of allowance for loan losses to total loans 0.58% 0.54%  
Residential loans | Other residential | Receivables Acquired with Deteriorated Credit Quality      
Allowance for Loan and Lease Losses [Roll Forward]      
Ending ALLL $ 0 $ 0  
Purchased credit-impaired 0 0  
Consumer loans | Installment and other consumer      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 425 566 629
Provision (reversal) (75) (123) (141)
Charge-offs (5) (20) (7)
Recoveries 27 2 85
Ending balance   425 566
Ending ALLL related to loans collectively evaluated for impairment 274 309  
Ending ALLL related to loans individually evaluated for impairment 98 116  
Ending ALLL 372 425  
Collectively evaluated for impairment 24,563 21,388  
Individually evaluated for impairment 932 1,251  
Total loans $ 25,495 $ 22,639  
Ratio of allowance for loan losses to total loans 1.46% 1.88%  
Allowance for loan losses to non-accrual loans 683.00% 512.00%  
Consumer loans | Installment and other consumer | Receivables Acquired with Deteriorated Credit Quality      
Allowance for Loan and Lease Losses [Roll Forward]      
Ending ALLL $ 0 $ 0  
Purchased credit-impaired 0 0  
Unallocated      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 1,096 969 506
Provision (reversal) 445 127 463
Charge-offs 0 0 0
Recoveries 0 0 0
Ending balance   1,096 $ 969
Ending ALLL related to loans collectively evaluated for impairment 1,541 1,096  
Ending ALLL related to loans individually evaluated for impairment 0 0  
Ending ALLL 1,541 1,096  
Collectively evaluated for impairment 0 0  
Individually evaluated for impairment 0 0  
Total loans 0 0  
Unallocated | Receivables Acquired with Deteriorated Credit Quality      
Allowance for Loan and Lease Losses [Roll Forward]      
Ending ALLL 0 0  
Purchased credit-impaired $ 0 $ 0