Loans, Allowance for Loan Losses and Credit Quality - Summary of Aging of Loans and Non-accrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Current	$ 1,229,224	$ 1,186,609
Nonaccrual Loans	2,875	4,264
Total Loans	1,236,200	1,193,386	$ 1,153,739
Past Due 30-89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Past Due	4,000	2,115
Past Due 90 Days or More
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Past Due	101	398
Home Equity Lines of Credit
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Current	43,671	43,069
Nonaccrual Loans	237	246
Total Loans	44,179	43,424
Home Equity Lines of Credit | Past Due 30-89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Past Due	271	109
Commercial Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	386,478	351,865
Construction and Land Development
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	164,199	150,602
Commercial Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Current	312,544	334,881
Nonaccrual Loans	303	92
Total Loans	313,115	335,161	352,543
Commercial Loans | Past Due 30-89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Past Due	268	188
Consumer Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Current	41,635	40,205
Nonaccrual Loans	187	228
Total Loans	42,069	40,646	39,782
Consumer Loans | Past Due 30-89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Past Due	247	213
Residential Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	286,160	271,688
Mortgage Loans on Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Current	831,374	768,454
Nonaccrual Loans	2,148	3,698
Total Loans	836,837	774,155
Mortgage Loans on Real Estate | Past Due 30-89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Past Due	3,214	1,605
Mortgage Loans on Real Estate | Past Due 90 Days or More
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Past Due	101	398
Mortgage Loans on Real Estate | Home Equity Lines of Credit
Financing Receivable Recorded Investment Past Due [Line Items]
Total Loans	44,179		45,683
Mortgage Loans on Real Estate | Commercial Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Current	384,994	349,677
Nonaccrual Loans	1,024	1,788
Total Loans	386,478	351,865	328,538
Mortgage Loans on Real Estate | Commercial Real Estate | Past Due 30-89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Past Due	460	388
Mortgage Loans on Real Estate | Commercial Real Estate | Past Due 90 Days or More
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Past Due		12
Mortgage Loans on Real Estate | Construction and Land Development
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Current	163,660	150,127
Nonaccrual Loans	48	446
Total Loans	164,199	150,602	134,584
Mortgage Loans on Real Estate | Construction and Land Development | Past Due 30-89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Past Due	491	29
Mortgage Loans on Real Estate | Residential Real Estate
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Current	282,720	268,650
Nonaccrual Loans	1,076	1,464
Total Loans	286,160	271,688	$ 252,609
Mortgage Loans on Real Estate | Residential Real Estate | Past Due 30-89 Days
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Past Due	2,263	1,188
Mortgage Loans on Real Estate | Residential Real Estate | Past Due 90 Days or More
Financing Receivable Recorded Investment Past Due [Line Items]
Accruing Loans, Past Due	$ 101	$ 386