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Regulatory Capital Requirements (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings from prior two years available for dividends	$ 21,391,000
Capital conservation buffer phase in, minimum (as a percentage)	2.25%		0.00%
Capital conservation buffer phase in, maximum (as a percentage)			2.50%
Capital conservation buffer (as a percentage)	7.11%
Tier 1 capital to risk-weighted assets [Abstract]
Actual	$ 165,117,000	$ 153,114,000
Actual	165,117,000	153,114,000
For capital adequacy purposes		$ 48,415,000
Risk-weighted assets [Abstract]
Actual (in hundredths)		14.23%
For capital adequacy purposes (in hundredths)		4.50%
Non Consolidated
Tier 2 capital to risk-weighted asets [Abstract]
Actual	175,448,000	$ 162,355,000
For capital adequacy purposes	92,892,000	86,063,000
To be well-capitalized under prompt corrective action provisions	116,115,000	107,579,000
Tier 1 capital to risk-weighted assets [Abstract]
Actual	164,116,000	151,526,000
For capital adequacy purposes	69,669,000	64,548,000
To be well-capitalized under prompt corrective action provisions	92,892,000	86,063,000
Actual	164,116,000	151,526,000
For capital adequacy purposes	52,252,000	48,411,000
To be well-capitalized under prompt corrective action provisions	$ 75,474,000	$ 69,926,000
Risk-weighted assets [Abstract]
Actual (in hundredths)	15.11%	15.09%
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)	14.13%	14.09%
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)	14.13%	14.09%
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	$ 164,116,000	$ 151,526,000
For capital adequacy purpose	77,269,000	71,386,000
To be well-capitalized under prompt corrective action provisions	$ 96,586,000	$ 89,233,000
Average assets [Abstract]
Actual (in hundredths)	8.51%	8.49%
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	$ 176,349,000	$ 163,943,000
For capital adequacy purposes	92,892,000	86,070,000
Tier 1 capital to risk-weighted assets [Abstract]
For capital adequacy purposes	69,669,000	$ 64,553,000
For capital adequacy purposes	$ 52,252,000
Risk-weighted assets [Abstract]
Actual (in hundredths)	15.19%	15.24%
For capital adequacy purposes (in hundredths)	8.00%	8.00%
Actual (in hundredths)	14.22%	14.23%
For capital adequacy purposes (in hundredths)	6.00%	6.00%
Actual (in hundredths)	14.22%
For capital adequacy purposes (in hundredths)	4.50%
Tier 1 capital to average assets [Abstract]
Actual	$ 165,117,000	$ 153,114,000
For capital adequacy purpose	$ 76,810,000	$ 71,435,000
Average assets [Abstract]
Actual (in hundredths)	8.60%	8.57%
For capital adequacy purpose (in hundredths)	4.00%	4.00%

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