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Loans and Allowance for Loan Losses (Tables) | 12 Months Ended
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Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items] |
Summary of composition of loan portfolio |
|  | December 31,
(dollars in thousands) |  | 2017 |  | 2016
Commercial |  |  |  |  |  |  |  |  |  |  |
Owner occupied RE |  | $ | 316,818 |  |  | 22.8% |  | 285,938 |  |  | 24.6%
Non-owner occupied RE |  |  | 312,798 |  |  | 22.6% |  | 239,574 |  |  | 20.6%
Construction |  |  | 51,179 |  |  | 3.7% |  | 33,393 |  |  | 2.9%
Business |  |  | 226,158 |  |  | 16.3% |  | 202,552 |  |  | 17.4%
Total commercial loans |  |  | 906,953 |  |  | 65.4% |  | 761,457 |  |  | 65.5%
Consumer |  |  |  |  |  |  |  |  |  |  |
Real estate |  |  | 273,050 |  |  | 19.7% |  | 215,588 |  |  | 18.5%
Home equity |  |  | 156,141 |  |  | 11.3% |  | 137,105 |  |  | 11.8%
Construction |  |  | 28,351 |  |  | 2.0% |  | 31,922 |  |  | 2.7%
Other |  |  | 22,575 |  |  | 1.6% |  | 17,572 |  |  | 1.5%
Total consumer loans |  |  | 480,117 |  |  | 34.6% |  | 402,187 |  |  | 34.5%
Total gross loans, net of deferred fees |  |  | 1,387,070 |  |  | 100.0% |  | 1,163,644 |  |  | 100.0%
Less – allowance for loan losses |  |  | (15,523 | ) |  |  |  | (14,855 | ) |  |
Total loans, net |  | $ | 1,371,547 |  |  |  |  | 1,148,789 |  |  |
Composition of gross loans by rate type |
|  | December 31,
(dollars in thousands) |  |  | 2017 |  | 2016
Variable rate loans |  | $ | 349,493 |  | 290,462
Fixed rate loans |  |  | 1,037,577 |  | 873,182
|  | $ | 1,387,070 |  | 1,163,644
Summary of nonperforming assets, including nonaccruing TDRs |
| December 31,
(dollars in thousands) |  | 2017 |  | 2016
Commercial |  |  |  |  |
Owner occupied RE |  | $ | - |  | 276
Non-owner occupied RE |  |  | 1,581 |  | 2,711
Construction |  |  | - |  | -
Business |  |  | 910 |  | 686
Consumer |  |  |  |  |
Real estate |  |  | 992 |  | 550
Home equity |  |  | 1,144 |  | 256
Construction |  |  | - |  | -
Other |  |  | 1 |  | 13
Nonaccruing troubled debt restructurings |  |  | 2,673 |  | 990
Total nonaccrual loans, including nonaccruing TDRs |  |  | 7,301 |  | 5,482
Other real estate owned |  |  | 242 |  | 639
Total nonperforming assets |  | $ | 7,543 |  | 6,121
Nonperforming assets as a percentage of: |  |  |  |  |
Total assets |  |  | 0.46% |  | 0.46%
Gross loans |  |  | 0.54% |  | 0.53%
Total loans over 90 days past due |  | $ | 2,027 |  | 1,984
Loans over 90 days past due and still accruing |  |  | - |  | -
Accruing TDRs |  |  | 5,145 |  | 5,675
Summary of key information for impaired loans |
|  |  |  | December 31, 2017
|  |  |  | Recorded investment |  |
|  |  |  |  |  |  | Impaired loans |  |
|  | Unpaid |  |  |  | with related |  | Related
|  | Principal |  | Impaired |  | allowance for |  | allowance for
(dollars in thousands) |  | Balance |  | loans |  | loan losses |  | loan losses
Commercial |  |  |  |  |  |  |  |  |
Owner occupied RE |  | $ | 2,281 |  | 2,235 |  | 464 |  | 179
Non-owner occupied RE |  |  | 6,827 |  | 3,665 |  | 2,646 |  | 750
Construction |  |  | - |  | - |  | - |  | -
Business |  |  | 3,735 |  | 2,764 |  | 1,993 |  | 1,061
Total commercial |  |  | 12,843 |  | 8,664 |  | 5,103 |  | 1,990
Consumer |  |  |  |  |  |  |  |  |
Real estate |  |  | 2,062 |  | 2,037 |  | 2,037 |  | 1,379
Home equity |  |  | 2,010 |  | 1,575 |  | 680 |  | 286
Construction |  |  | - |  | - |  | - |  | -
Other |  |  | 171 |  | 170 |  | 170 |  | 22
Total consumer |  |  | 4,243 |  | 3,782 |  | 2,887 |  | 1,687
Total |  | $ | 17,086 |  | 12,446 |  | 7,990 |  | 3,677
|  |  |  | December 31, 2016
|  |  |  | Recorded investment |  |
|  |  |  |  |  |  | Impaired loans |  |
|  | Unpaid |  |  |  | with related |  | Related
|  | Principal |  | Impaired |  | allowance for |  | allowance for
(dollars in thousands) |  | Balance |  | loans |  | loan losses |  | loan losses
Commercial |  |  |  |  |  |  |  |  |
Owner occupied RE |  | $ | 2,284 |  | 2,243 |  | 2,224 |  | 263
Non-owner occupied RE |  |  | 7,238 |  | 4,031 |  | 1,638 |  | 457
Construction |  |  | - |  | - |  | - |  | -
Business |  |  | 3,699 |  | 2,593 |  | 1,610 |  | 1,154
Total commercial |  |  | 13,221 |  | 8,867 |  | 5,472 |  | 1,874
Consumer |  |  |  |  |  |  |  |  |
Real estate |  |  | 1,853 |  | 1,843 |  | 1,843 |  | 682
Home equity |  |  | 207 |  | 257 |  | - |  | -
Construction |  |  | - |  | - |  | - |  | -
Other |  |  | 261 |  | 190 |  | 177 |  | 88
Total consumer |  |  | 2,321 |  | 2,290 |  | 2,020 |  | 770
Total |  | $ | 15,542 |  | 11,157 |  | 7,492 |  | 2,644
Summary of average recorded investment and interest income recognized on impaired loans |
|  | Year ended December 31,
|  | 2017 |  | 2016 |  | 2015
|  | Average |  | Recognized |  | Average |  | Recognized |  | Average |  | Recognized
|  | recorded |  | interest |  | recorded |  | interest |  | recorded |  | interest
(dollars in thousands) |  | investment |  | income |  | investment |  | income |  | investment |  | income
Commercial |  |  |  |  |  |  |  |  |  |  |  |  |
Owner occupied RE |  | $ | 2,255 |  | 104 |  | 2,263 |  | 112 |  | 884 |  | 6
Non-owner occupied RE |  |  | 4,144 |  | 199 |  | 4,106 |  | 200 |  | 6,137 |  | 128
Construction |  |  | - |  | - |  | - |  | - |  | 1,888 |  | 74
Business |  |  | 2,823 |  | 162 |  | 2,873 |  | 135 |  | 4,067 |  | 148
Total commercial |  |  | 9,222 |  | 465 |  | 9,242 |  | 447 |  | 12,976 |  | 356
Consumer |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate |  |  | 2,047 |  | 69 |  | 1,854 |  | 81 |  | 1,112 |  | 46
Home equity |  |  | 1,576 |  | 97 |  | 257 |  | 2 |  | 252 |  | 7
Construction |  |  | - |  | - |  | - |  | - |  | - |  | -
Other |  |  | 174 |  | 6 |  | 203 |  | 6 |  | 208 |  | 7
Total consumer |  |  | 3,797 |  | 172 |  | 2,314 |  | 89 |  | 1,572 |  | 60
Total |  | $ | 13,019 |  | 637 |  | 11,556 |  | 536 |  | 14,548 |  | 416
Summary of activity related to allowance for loan losses |
| Year ended December 31,
(dollars in thousands) |  |  | 2017 |  |  | 2016 |  |  | 2015 |
Balance, beginning of period |  | $ | 14,855 |  |  | 13,629 |  |  | 11,752 |
Provision for loan losses |  |  | 2,000 |  |  | 2,300 |  |  | 3,200 |
Loan charge-offs: |  |  |  |  |  |  |  |  |  |
Commercial |  |  |  |  |  |  |  |  |  |
Owner occupied RE |  |  | - |  |  | (5 | ) |  | (48 | )
Non-owner occupied RE |  |  | (589 | ) |  | (100 | ) |  | (258 | )
Construction |  |  | - |  |  | (42 | ) |  | (50 | )
Business |  |  | (638 | ) |  | (1,031 | ) |  | (881 | )
Total commercial |  |  | (1,227 | ) |  | (1,178 | ) |  | (1,237 | )
Consumer |  |  |  |  |  |  |  |  |  |
Real estate |  |  | - |  |  | (194 | ) |  | (173 | )
Home equity |  |  | (400 | ) |  | (66 | ) |  | (93 | )
Construction |  |  | - |  |  | - |  |  | - |
Other |  |  | (11 | ) |  | (210 | ) |  | (5 | )
Total consumer |  |  | (411 | ) |  | (470 | ) |  | (271 | )
Total loan charge-offs |  |  | (1,638 | ) |  | (1,648 | ) |  | (1,508 | )
Loan recoveries: |  |  |  |  |  |  |  |  |  |
Commercial |  |  |  |  |  |  |  |  |  |
Owner occupied RE |  |  | - |  |  | - |  |  | - |
Non-owner occupied RE |  |  | 119 |  |  | 155 |  |  | 10 |
Construction |  |  | - |  |  | - |  |  | - |
Business |  |  | 86 |  |  | 403 |  |  | 129 |
Total commercial |  |  | 205 |  |  | 558 |  |  | 139 |
Consumer |  |  |  |  |  |  |  |  |  |
Real estate |  |  | 86 |  |  | 10 |  |  | - |
Home equity |  |  | 13 |  |  | 1 |  |  | 46 |
Construction |  |  | - |  |  | - |  |  | - |
Other |  |  | 2 |  |  | 5 |  |  | - |
Total consumer |  |  | 101 |  |  | 16 |  |  | 46 |
Total recoveries |  |  | 306 |  |  | 574 |  |  | 185 |
Net loan charge-offs |  |  | (1,332 | ) |  | (1,074 | ) |  | (1,323 | )
Balance, end of period |  | $ | 15,523 |  |  | 14,855 |  |  | 13,629 |
Summary of allowance for loan losses by commercial and consumer portfolio segments |
| Year ended December 31, 2017 |
(dollars in thousands) |  | Commercial |  |  | Consumer |  | Unallocated |  | Total |
Balance, beginning of period |  | $ | 10,039 |  |  | 4,816 |  |  | - |  | 14,855 |
Provision |  |  | 920 |  |  | 1,080 |  |  | - |  | 2,000 |
Loan charge-offs |  |  | (1,227 | ) |  | (411 | ) |  | - |  | (1,638 | )
Loan recoveries |  |  | 205 |  |  | 101 |  |  | - |  | 306 |
Net loan charge-offs |  |  | (1,022 | ) |  | (310 | ) |  | - |  | (1,332 | )
Balance, end of period |  | $ | 9,937 |  |  | 5,586 |  |  | - |  | 15,523 |
| Year ended December 31, 2016 |
|  | Commercial |  |  | Consumer |  | Unallocated |  | Total |
Balance, beginning of period |  | $ | 9,672 |  |  | 3,957 |  |  | - |  | 13,629 |
Provision |  |  | 987 |  |  | 1,313 |  |  | - |  | 2,300 |
Loan charge-offs |  |  | (1,178 | ) |  | (470 | ) |  | - |  | (1,648 | )
Loan recoveries |  |  | 558 |  |  | 16 |  |  | - |  | 574 |
Net loan charge-offs |  |  | (620 | ) |  | (454 | ) |  | - |  | (1,074 | )
Balance, end of period |  | $ | 10,039 |  |  | 4,816 |  |  | - |  | 14,855 |
Summary of allowance for loan losses and recorded investment in loans by impairment methodology |
|  | December 31, 2017
|  |  | Allowance for loan losses |  | Recorded investment in loans
(dollars in thousands) |  | Commercial |  | Consumer |  | Total |  | Commercial |  | Consumer |  | Total
Individually evaluated |  | $ | 1,990 |  | 1,687 |  | 3,677 |  | 8,664 |  | 3,782 |  | 12,446
Collectively evaluated |  |  | 7,947 |  | 3,899 |  | 11,846 |  | 898,289 |  | 476,335 |  | 1,374,624
Total |  | $ | 9,937 |  | 5,586 |  | 15,523 |  | 906,953 |  | 480,117 |  | 1,387,070
|  | December 31, 2016
|  | Allowance for loan losses |  | Recorded investment in loans
|  | Commercial |  | Consumer |  | Total |  | Commercial |  | Consumer |  | Total
Individually evaluated |  | $ | 1,874 |  | 770 |  | 2,644 |  | 8,867 |  | 2,290 |  | 11,157
Collectively evaluated |  |  | 8,165 |  | 4,046 |  | 12,211 |  | 752,590 |  | 399,897 |  | 1,152,487
Total |  | $ | 10,039 |  | 4,816 |  | 14,855 |  | 761,457 |  | 402,187 |  | 1,163,644
Commercial [Member] |
Financing Receivable, Allowance for Credit Losses [Line Items] |
Outstanding commercial and consumer loans which include loans on nonaccrual by past due status |
| December 31, 2017
|  | Owner |  | Non-owner |  |  |  |  |  |
(dollars in thousands) |  | occupied RE |  | occupied RE |  | Construction |  | Business |  | Total
Current |  | $ | 316,818 |  | 312,477 |  | 51,179 |  | 224,861 |  | 905,335
30-59 days past due |  |  | - |  | 129 |  | - |  | 416 |  | 545
60-89 days past due |  |  | - |  | - |  | - |  | - |  | -
Greater than 90 days |  |  | - |  | 192 |  | - |  | 881 |  | 1,073
|  | $ | 316,818 |  | 312,798 |  | 51,179 |  | 226,158 |  | 906,953
| December 31, 2016
|  | Owner |  | Non-owner |  |  |  |  |  |
|  | occupied RE |  | occupied RE |  | Construction |  | Business |  | Total
Current |  | $ | 284,700 |  | 238,346 |  | 33,393 |  | 200,624 |  | 757,063
30-59 days past due |  |  | 981 |  | - |  | - |  | 1,423 |  | 2,404
60-89 days past due |  |  | 257 |  | 56 |  | - |  | - |  | 313
Greater than 90 days |  |  | - |  | 1,172 |  | - |  | 505 |  | 1,677
|  | $ | 285,938 |  | 239,574 |  | 33,393 |  | 202,552 |  | 761,457
Summary of breakdown of outstanding loans by risk category |
| December 31, 2017
|  | Owner |  | Non-owner |  |  |  |  |  |
(dollars in thousands) |  | occupied RE |  | occupied RE |  | Construction |  | Business |  | Total
Pass |  | $ | 312,628 |  | 306,965 |  | 51,179 |  | 215,729 |  | 886,501
Special Mention |  |  | 1,770 |  | 2,082 |  | - |  | 5,540 |  | 9,392
Substandard |  |  | 2,420 |  | 3,751 |  | - |  | 4,889 |  | 11,060
Doubtful |  |  | - |  | - |  | - |  | - |  | -
|  | $ | 316,818 |  | 312,798 |  | 51,179 |  | 226,158 |  | 906,953
| December 31, 2016
|  | Owner |  | Non-owner |  |  |  |  |  |
|  | occupied RE |  | occupied RE |  | Construction |  | Business |  | Total
Pass |  | $ | 282,055 |  | 234,957 |  | 33,393 |  | 193,517 |  | 743,922
Special Mention |  |  | 1,097 |  | 975 |  | - |  | 2,489 |  | 4,561
Substandard |  |  | 2,786 |  | 3,642 |  | - |  | 6,546 |  | 12,974
Doubtful |  |  | - |  | - |  | - |  | - |  | -
|  | $ | 285,938 |  | 239,574 |  | 33,393 |  | 202,552 |  | 761,457
Consumer [Member] |
Financing Receivable, Allowance for Credit Losses [Line Items] |
Outstanding commercial and consumer loans which include loans on nonaccrual by past due status |
| December 31, 2017
(dollars in thousands) |  | Real estate |  | Home equity |  | Construction |  | Other |  | Total
Current |  | $ | 271,284 |  | 154,821 |  | 28,351 |  | 22,506 |  | 476,962
30-59 days past due |  |  | 681 |  | 325 |  | - |  | 69 |  | 1,075
60-89 days past due |  |  | 131 |  | 995 |  | - |  | - |  | 1,126
Greater than 90 days |  |  | 954 |  | - |  | - |  | - |  | 954
|  | $ | 273,050 |  | 156,141 |  | 28,351 |  | 22,575 |  | 480,117
| December 31, 2016
|  | Real estate |  | Home equity |  | Construction |  | Other |  | Total
Current |  | $ | 214,228 |  | 136,638 |  | 31,922 |  | 17,427 |  | 400,215
30-59 days past due |  |  | 1,041 |  | 210 |  | - |  | 126 |  | 1,377
60-89 days past due |  |  | 282 |  | - |  | - |  | 6 |  | 288
Greater than 90 days |  |  | 37 |  | 257 |  | - |  | 13 |  | 307
|  | $ | 215,588 |  | 137,105 |  | 31,922 |  | 17,572 |  | 402,187
Summary of breakdown of outstanding loans by risk category |
| December 31, 2017
(dollars in thousands) |  | Real estate |  | Home equity |  | Construction |  | Other |  | Total
Pass |  | $ | 269,422 |  | 152,545 |  | 28,351 |  | 22,367 |  | 472,685
Special Mention |  |  | 715 |  | 1,025 |  | - |  | 88 |  | 1,828
Substandard |  |  | 2,913 |  | 2,571 |  | - |  | 120 |  | 5,604
Doubtful |  |  | - |  | - |  | - |  | - |  | -
Loss |  |  | - |  | - |  | - |  | - |  | -
|  | $ | 273,050 |  | 156,141 |  | 28,351 |  | 22,575 |  | 480,117
|  | December 31, 2016
|  | Real estate |  | Home equity |  | Construction |  | Other |  | Total
Pass |  | $ | 211,563 |  | 134,124 |  | 31,922 |  | 17,485 |  | 395,094
Special Mention |  |  | 1,064 |  | 2,109 |  | - |  | 16 |  | 3,189
Substandard |  |  | 2,961 |  | 872 |  | - |  | 71 |  | 3,904
Doubtful |  |  | - |  | - |  | - |  | - |  | -
Loss |  |  | - |  | - |  | - |  | - |  | -
|  | $ | 215,588 |  | 137,105 |  | 31,922 |  | 17,572 |  | 402,187

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