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Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Allowance for loan losses [Roll Forward]                
Balance, beginning of period $ 14,671 $ 13,834 $ 16,008 $ 13,563 $ 13,563      
Charge-offs 0 0 (3,835) 0 0      
Recoveries 121 112 319 263 325      
Provision (recovery) 900 750 3,200 870 2,120      
Balance, end of period 15,692 14,696 15,692 14,696 16,008      
Ending allowance balance attributable to loans:                
Individually evaluated for impairment           $ 700 $ 3,026 $ 1,774
Collectively evaluated for impairment           14,992 12,982 12,922
Total ending allowance balance 14,671 13,834 16,008 13,563 13,563 15,692 16,008 14,696
Recorded Investment in Loans, September 30, 2017                
Individually evaluated for impairment           5,837 6,922 6,999
Collectively evaluated for impairment           1,959,333 1,042,776 959,546
Purchased impaired loans           4,490    
Total Loans           1,969,660 1,049,698 966,545
Real estate construction                
Allowance for loan losses [Roll Forward]                
Balance, beginning of period 877 1,178 1,277 1,056 1,056      
Charge-offs 0 0 0 0 0      
Recoveries 0 0 0 0 0      
Provision (recovery) (188) 73 (588) 195 221      
Balance, end of period 689 1,251 689 1,251 1,277      
Ending allowance balance attributable to loans:                
Individually evaluated for impairment           223 221 284
Collectively evaluated for impairment           466 1,056 967
Total ending allowance balance 877 1,178 1,277 1,056 1,056 689 1,277 1,251
Recorded Investment in Loans, September 30, 2017                
Individually evaluated for impairment           26 940 1,001
Collectively evaluated for impairment           104,167 90,882 78,620
Purchased impaired loans           0    
Total Loans           104,193 91,822 79,621
Commercial real estate - owner occupied                
Allowance for loan losses [Roll Forward]                
Balance, beginning of period 3,037 3,142 2,943 3,042 3,042      
Charge-offs 0 0 0 0 0      
Recoveries 0 0 18 0 0      
Provision (recovery) 670 (141) 746 (41) (99)      
Balance, end of period 3,707 3,001 3,707 3,001 2,943      
Ending allowance balance attributable to loans:                
Individually evaluated for impairment           0 0 0
Collectively evaluated for impairment           3,707 2,943 3,001
Total ending allowance balance 3,037 3,142 2,943 3,042 3,042 3,707 2,943 3,001
Recorded Investment in Loans, September 30, 2017                
Individually evaluated for impairment           0 0 550
Collectively evaluated for impairment           442,033 250,440 237,674
Purchased impaired loans           1,095    
Total Loans           443,128 250,440 238,224
Commercial real estate - nonowner occupied                
Allowance for loan losses [Roll Forward]                
Balance, beginning of period 2,691 1,969 2,145 1,862 1,862      
Charge-offs 0 0 0 0 0      
Recoveries 0 0 0 0 0      
Provision (recovery) 651 171 1,197 278 283      
Balance, end of period 3,342 2,140 3,342 2,140 2,145      
Ending allowance balance attributable to loans:                
Individually evaluated for impairment           0 0 0
Collectively evaluated for impairment           3,342 2,145 2,140
Total ending allowance balance 2,691 1,969 2,145 1,862 1,862 3,342 2,145 2,140
Recorded Investment in Loans, September 30, 2017                
Individually evaluated for impairment           0 0 0
Collectively evaluated for impairment           434,261 184,688 174,342
Purchased impaired loans           920    
Total Loans           435,181 184,688 174,342
Residential real estate                
Allowance for loan losses [Roll Forward]                
Balance, beginning of period 2,382 2,854 2,510 2,862 2,862      
Charge-offs 0 0 (1) 0 0      
Recoveries 107 9 128 30 40      
Provision (recovery) (178) (229) (326) (258) (392)      
Balance, end of period 2,311 2,634 2,311 2,634 2,510      
Ending allowance balance attributable to loans:                
Individually evaluated for impairment           0 0 0
Collectively evaluated for impairment           2,311 2,510 2,634
Total ending allowance balance 2,382 2,854 2,510 2,862 2,862 2,311 2,510 2,634
Recorded Investment in Loans, September 30, 2017                
Individually evaluated for impairment           572 431 176
Collectively evaluated for impairment           509,674 203,982 202,429
Purchased impaired loans           2,375    
Total Loans           512,621 204,413 202,605
Commercial                
Allowance for loan losses [Roll Forward]                
Balance, beginning of period 5,595 4,574 7,053 4,612 4,612      
Charge-offs 0 0 (3,828) 0 0      
Recoveries 14 103 171 233 285      
Provision (recovery) (52) 909 2,161 741 2,156      
Balance, end of period 5,557 5,586 5,557 5,586 7,053      
Ending allowance balance attributable to loans:                
Individually evaluated for impairment           477 2,805 1,490
Collectively evaluated for impairment           5,080 4,248 4,096
Total ending allowance balance 5,595 4,574 7,053 4,612 4,612 5,557 7,053 5,586
Recorded Investment in Loans, September 30, 2017                
Individually evaluated for impairment           5,236 5,551 5,272
Collectively evaluated for impairment           444,120 305,935 259,522
Purchased impaired loans           94    
Total Loans           449,450 311,486 264,794
Consumer                
Allowance for loan losses [Roll Forward]                
Balance, beginning of period 89 117 80 129 129      
Charge-offs 0 0 (6) 0 0      
Recoveries 0 0 2 0 0      
Provision (recovery) (3) (33) 10 (45) (49)      
Balance, end of period 86 84 86 84 80      
Ending allowance balance attributable to loans:                
Individually evaluated for impairment           0 0 0
Collectively evaluated for impairment           86 80 84
Total ending allowance balance $ 89 $ 117 $ 80 $ 129 $ 129 86 80 84
Recorded Investment in Loans, September 30, 2017                
Individually evaluated for impairment           3 0 0
Collectively evaluated for impairment           25,078 6,849 6,959
Purchased impaired loans           6    
Total Loans           $ 25,087 $ 6,849 $ 6,959