Loans, Allowance for Credit Losses and Impaired Loans - Aging (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Past due financing receivables
Total Past Due	$ 8,090	$ 7,430
Current Balance	1,012,632	992,694
Total Financing Receivables	1,020,722	1,000,124
Recorded Investment >90 Days Past Due and Accruing	293	5
Non-accrual loans	5,311	4,541
Unamortized discounts on acquired loans	5,533	6,136
30-59 Days Past Due
Past due financing receivables
Total Past Due	3,911	2,587
Non-accrual loans	1,500	956
60-89 Days Past Due
Past due financing receivables
Total Past Due	237	2,047
Non-accrual loans	155	81
Greater than 90 Days Past Due
Past due financing receivables
Total Past Due	3,942	2,796
Non-accrual loans	3,600	2,600
Real Estate Mortgage | Construction and Land Development
Past due financing receivables
Total Past Due	217	601
Current Balance	90,655	84,669
Total Financing Receivables	90,872	85,270
Non-accrual loans	177	177
Real Estate Mortgage | Construction and Land Development | 30-59 Days Past Due
Past due financing receivables
Total Past Due		424
Real Estate Mortgage | Construction and Land Development | 60-89 Days Past Due
Past due financing receivables
Total Past Due	40
Real Estate Mortgage | Construction and Land Development | Greater than 90 Days Past Due
Past due financing receivables
Total Past Due	177	177
Real Estate Mortgage | Residential Real Estate
Past due financing receivables
Total Past Due	3,078	2,675
Current Balance	203,754	207,003
Total Financing Receivables	206,832	209,678
Recorded Investment >90 Days Past Due and Accruing	293
Non-accrual loans	1,508	1,620
Real Estate Mortgage | Residential Real Estate | 30-59 Days Past Due
Past due financing receivables
Total Past Due	2,008	1,296
Real Estate Mortgage | Residential Real Estate | 60-89 Days Past Due
Past due financing receivables
Total Past Due	155	677
Real Estate Mortgage | Residential Real Estate | Greater than 90 Days Past Due
Past due financing receivables
Total Past Due	915	702
Real Estate Mortgage | Nonresidential
Past due financing receivables
Total Past Due	3,243	2,602
Current Balance	555,251	545,389
Total Financing Receivables	558,494	547,991
Non-accrual loans	2,346	2,608
Real Estate Mortgage | Nonresidential | 30-59 Days Past Due
Past due financing receivables
Total Past Due	1,631	635
Real Estate Mortgage | Nonresidential | 60-89 Days Past Due
Past due financing receivables
Total Past Due	42	144
Real Estate Mortgage | Nonresidential | Greater than 90 Days Past Due
Past due financing receivables
Total Past Due	1,570	1,823
Real Estate Mortgage | Home Equity Loans
Past due financing receivables
Total Past Due	19
Current Balance	37,577	37,912
Total Financing Receivables	37,596	37,912
Non-accrual loans		5
Real Estate Mortgage | Home Equity Loans | 30-59 Days Past Due
Past due financing receivables
Total Past Due	19
Commercial
Past due financing receivables
Total Past Due	1,527	1,532
Current Balance	119,389	111,981
Total Financing Receivables	120,916	113,513
Non-accrual loans	1,280	131
Commercial | 30-59 Days Past Due
Past due financing receivables
Total Past Due	247	231
Commercial | 60-89 Days Past Due
Past due financing receivables
Total Past Due		1,207
Commercial | Greater than 90 Days Past Due
Past due financing receivables
Total Past Due	1,280	94
Consumer and Other
Past due financing receivables
Total Past Due	6	20
Current Balance	6,006	5,740
Total Financing Receivables	6,012	5,760
Recorded Investment >90 Days Past Due and Accruing		5
Consumer and Other | 30-59 Days Past Due
Past due financing receivables
Total Past Due	$ 6	1
Consumer and Other | 60-89 Days Past Due
Past due financing receivables
Total Past Due		$ 19