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Allowance for Loan Losses - Activity by Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       $ 11,639       $ 11,232 $ 11,639 $ 11,232 $ 10,729
Chargeoffs                 1,661 1,120 1,273
Recoveries                 225 277 276
Provision for loan losses $ 1,500 $ 1,800 $ 2,350 400 $ 375 $ 250 $ 250 375 6,050 1,250 1,500
Ending balance 16,253       11,639       16,253 11,639 11,232
Ending balance specifically evaluated for impairment 462       2,213       462 2,213 2,308
Ending balance collectively evaluated for impairment 15,791       9,426       15,791 9,426 8,924
Ending balance 1,476,761       1,297,075       1,476,761 1,297,075 1,238,283
Ending balance specifically evaluated for impairment 16,039       29,274       16,039 29,274 31,751
Ending balance collectively evaluated for impairment 1,460,722       1,267,801       1,460,722 1,267,801 1,206,532
Commercial | Real estate                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       3,742       3,567 3,742 3,567 3,872
Chargeoffs                 1,088 89 168
Recoveries                 0 15 52
Provision for loan losses                 2,524 249 (189)
Ending balance 5,178       3,742       5,178 3,742 3,567
Ending balance specifically evaluated for impairment 112       251       112 251 260
Ending balance collectively evaluated for impairment 5,066       3,491       5,066 3,491 3,307
Ending balance 442,121       372,810       442,121 372,810 353,243
Ending balance specifically evaluated for impairment 3,029       6,309       3,029 6,309 9,760
Ending balance collectively evaluated for impairment 439,092       366,501       439,092 366,501 343,483
Commercial | Construction                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       365       255 365 255 434
Chargeoffs                 0 0 0
Recoveries                 0 0 0
Provision for loan losses                 297 110 (179)
Ending balance 662       365       662 365 255
Ending balance specifically evaluated for impairment 18       0       18 0 0
Ending balance collectively evaluated for impairment 644       365       644 365 255
Ending balance 56,565       38,084       56,565 38,084 27,304
Ending balance specifically evaluated for impairment 770       958       770 958 721
Ending balance collectively evaluated for impairment 55,795       37,126       55,795 37,126 26,583
Commercial | Other                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       3,329       3,541 3,329 3,541 3,358
Chargeoffs                 27 179 423
Recoveries                 37 73 40
Provision for loan losses                 99 (106) 566
Ending balance 3,438       3,329       3,438 3,329 3,541
Ending balance specifically evaluated for impairment 169       1,273       169 1,273 1,696
Ending balance collectively evaluated for impairment 3,269       2,056       3,269 2,056 1,845
Ending balance 285,015       218,773       285,015 218,773 196,391
Ending balance specifically evaluated for impairment 1,779       7,075       1,779 7,075 9,259
Ending balance collectively evaluated for impairment 283,236       211,698       283,236 211,698 187,132
Municipal                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       27       24 27 24 20
Chargeoffs                 0 0 0
Recoveries                 0 0 0
Provision for loan losses                 144 3 4
Ending balance 171       27       171 27 24
Ending balance specifically evaluated for impairment 0       0       0 0 0
Ending balance collectively evaluated for impairment 171       27       171 27 24
Ending balance 43,783       41,288       43,783 41,288 51,128
Ending balance specifically evaluated for impairment 0       0       0 0 0
Ending balance collectively evaluated for impairment 43,783       41,288       43,783 41,288 51,128
Residential | Construction                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       25       34 25 34 36
Chargeoffs                 0 0 0
Recoveries                 0 0 0
Provision for loan losses                 77 (9) (2)
Ending balance 102       25       102 25 34
Ending balance specifically evaluated for impairment 0       0       0 0 0
Ending balance collectively evaluated for impairment 102       25       102 25 34
Ending balance 21,600       14,813       21,600 14,813 17,743
Ending balance specifically evaluated for impairment 0       0       0 0 0
Ending balance collectively evaluated for impairment 21,600       14,813       21,600 14,813 17,743
Residential | Term                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       1,024       1,235 1,024 1,235 1,130
Chargeoffs                 66 445 213
Recoveries                 34 57 64
Provision for loan losses                 1,587 177 254
Ending balance 2,579       1,024       2,579 1,024 1,235
Ending balance specifically evaluated for impairment 163       237       163 237 335
Ending balance collectively evaluated for impairment 2,416       787       2,416 787 900
Ending balance 522,070       492,455       522,070 492,455 469,145
Ending balance specifically evaluated for impairment 9,414       12,439       9,414 12,439 10,904
Ending balance collectively evaluated for impairment 512,656       480,016       512,656 480,016 458,241
Home equity line of credit                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       1,078       730 1,078 730 692
Chargeoffs                 153 69 121
Recoveries                 22 4 24
Provision for loan losses                 264 413 135
Ending balance 1,211       1,078       1,211 1,078 730
Ending balance specifically evaluated for impairment 0       447       0 447 17
Ending balance collectively evaluated for impairment 1,211       631       1,211 631 713
Ending balance 79,750       92,349       79,750 92,349 98,469
Ending balance specifically evaluated for impairment 1,039       2,488       1,039 2,488 1,092
Ending balance collectively evaluated for impairment 78,711       89,861       78,711 89,861 97,377
Consumer                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       867       630 867 630 545
Chargeoffs                 327 338 348
Recoveries                 132 128 96
Provision for loan losses                 106 447 337
Ending balance 778       867       778 867 630
Ending balance specifically evaluated for impairment 0       5       0 5 0
Ending balance collectively evaluated for impairment 778       862       778 862 630
Ending balance 25,857       26,503       25,857 26,503 24,860
Ending balance specifically evaluated for impairment 8       5       8 5 15
Ending balance collectively evaluated for impairment 25,849       26,498       25,849 26,498 24,845
Unallocated                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Beginning balance       $ 1,182       $ 1,216 1,182 1,216 642
Chargeoffs                 0 0 0
Recoveries                 0 0 0
Provision for loan losses                 952 (34) 574
Ending balance 2,134       1,182       2,134 1,182 1,216
Ending balance specifically evaluated for impairment 0       0       0 0 0
Ending balance collectively evaluated for impairment 2,134       1,182       2,134 1,182 1,216
Ending balance 0       0       0 0 0
Ending balance specifically evaluated for impairment 0       0       0 0 0
Ending balance collectively evaluated for impairment $ 0       $ 0       $ 0 $ 0 $ 0