Loans, Allowance for Credit Losses and Impaired Loans - Aging (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Past due financing receivables
Total Past Due	$ 7,511,000	$ 10,480,000
Current Balance	640,097,000	623,423,000
Total Financing Receivables	647,608,000	633,903,000
Recorded Investment >90 Days Past Due and Accruing	156,000	606,000
Non-accrual loans	4,982,000	9,148,000
Unamortized discounts on acquired loans	893,000	1,327,000
Other real estate secured
Past due financing receivables
Total Past Due	3,690,000	5,747,000
Current Balance	432,702,000	420,474,000
Total Financing Receivables	436,392,000	426,221,000
Recorded Investment >90 Days Past Due and Accruing		338,000
Non-accrual loans	2,713,000	4,423,000
1 - 4 Family residential secured
Past due financing receivables
Total Past Due	3,231,000	3,397,000
Current Balance	143,298,000	142,906,000
Total Financing Receivables	146,529,000	146,303,000
Recorded Investment >90 Days Past Due and Accruing	156,000
Non-accrual loans	2,100,000	4,547,000
Other
Past due financing receivables
Total Past Due	590,000	1,336,000
Current Balance	64,097,000	60,043,000
Total Financing Receivables	64,687,000	61,379,000
Recorded Investment >90 Days Past Due and Accruing		268,000
Non-accrual loans	169,000	178,000
30-59 Days Past Due
Past due financing receivables
Total Past Due	2,590,000	3,203,000
Non-accrual loans	817,000
30-59 Days Past Due | Other real estate secured
Past due financing receivables
Total Past Due	777,000	876,000
30-59 Days Past Due | 1 - 4 Family residential secured
Past due financing receivables
Total Past Due	1,708,000	1,292,000
30-59 Days Past Due | Other
Past due financing receivables
Total Past Due	105,000	1,035,000
60-89 Days Past Due
Past due financing receivables
Total Past Due	2,197,000	2,158,000
60-89 Days Past Due | Other real estate secured
Past due financing receivables
Total Past Due	1,195,000	1,742,000
60-89 Days Past Due | 1 - 4 Family residential secured
Past due financing receivables
Total Past Due	517,000	383,000
60-89 Days Past Due | Other
Past due financing receivables
Total Past Due	485,000	33,000
Greater than 90 Days Past Due
Past due financing receivables
Total Past Due	2,724,000	5,119,000
Non-accrual loans	2,500,000	4,500,000
Greater than 90 Days Past Due | Other real estate secured
Past due financing receivables
Total Past Due	1,718,000	3,129,000
Greater than 90 Days Past Due | 1 - 4 Family residential secured
Past due financing receivables
Total Past Due	$ 1,006,000	1,722,000
Greater than 90 Days Past Due | Other
Past due financing receivables
Total Past Due		$ 268,000