Regulatory Capital Requirements (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings from prior two years available for dividends	$ 26,111,000
Capital conservation buffer phase in, minimum (as a percentage)	0.00%		7.19%
Capital conservation buffer phase in, maximum (as a percentage)			2.50%
Tier 1 capital to risk-weighted assets [Abstract]
Actual	$ 178,773,000	$ 165,117,000
Actual	178,773,000	165,117,000
For capital adequacy purposes		$ 52,252,000
Risk-weighted assets [Abstract]
Actual (in hundredths)		14.22%
For capital adequacy purposes (in hundredths)		4.50%
Non Consolidated
Tier 2 capital to risk-weighted asets [Abstract]
Actual	189,421,000	$ 175,448,000
For capital adequacy purposes	99,756,000	92,892,000
To be well-capitalized under prompt corrective action provisions	124,695,000	116,115,000
Tier 1 capital to risk-weighted assets [Abstract]
Actual	177,682,000	164,116,000
For capital adequacy purposes	74,817,000	69,669,000
To be well-capitalized under prompt corrective action provisions	99,756,000	92,892,000
Actual	177,682,000	164,116,000
For capital adequacy purposes	56,113,000	52,252,000
To be well-capitalized under prompt corrective action provisions	$ 81,052,000	$ 75,474,000
Risk-weighted assets [Abstract]
Actual (in hundredths)	15.19%	15.11%
For capital adequacy purposes (in hundredths)	8.00%	8.00%
To be well-capitalized under prompt corrective action provisions (in hundredths)	10.00%	10.00%
Actual (in hundredths)	14.25%	14.13%
For capital adequacy purposes (in hundredths)	6.00%	6.00%
To be well-capitalized under prompt corrective action provisions (in hundredths)	8.00%	8.00%
Actual (in hundredths)	14.25%	14.13%
For capital adequacy purposes (in hundredths)	4.50%	4.50%
To be well-capitalized under prompt corrective action provisions (in hundredths)	6.50%	6.50%
Tier 1 capital to average assets [Abstract]
Actual	$ 177,682,000	$ 164,116,000
For capital adequacy purpose	80,385,000	77,269,000
To be well-capitalized under prompt corrective action provisions	$ 100,481,000	$ 96,586,000
Average assets [Abstract]
Actual (in hundredths)	8.84%	8.51%
For capital adequacy purpose (in hundredths)	4.00%	4.00%
To be well-capitalized under prompt corrective action provisions (in hundredths)	5.00%	5.00%
Consolidated
Tier 2 capital to risk-weighted asets [Abstract]
Actual	$ 190,412,000	$ 176,349,000
For capital adequacy purposes	99,756,000	92,892,000
Tier 1 capital to risk-weighted assets [Abstract]
For capital adequacy purposes	74,817,000	$ 69,669,000
For capital adequacy purposes	$ 56,113,000
Risk-weighted assets [Abstract]
Actual (in hundredths)	15.27%	15.19%
For capital adequacy purposes (in hundredths)	8.00%	8.00%
Actual (in hundredths)	14.34%	14.22%
For capital adequacy purposes (in hundredths)	6.00%	6.00%
Actual (in hundredths)	14.34%
For capital adequacy purposes (in hundredths)	4.50%
Tier 1 capital to average assets [Abstract]
Actual	$ 178,773,000	$ 165,117,000
For capital adequacy purpose	$ 80,527,000	$ 76,810,000
Average assets [Abstract]
Actual (in hundredths)	8.88%	8.60%
For capital adequacy purpose (in hundredths)	4.00%	4.00%