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Regulatory Capital Requirements (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2015
--- | --- | --- | ---
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Retained earnings from prior two years available for dividends | $ 15,850,000 |  |
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) | 7.24% |  |
Tier 1 capital to risk-weighted assets [Abstract] |  |  |
Actual | $ 153,114,000 | $ 142,564,000 |
Actual | 153,114,000 | 142,564,000 |
For capital adequacy purposes |  | $ 43,835,000 |
Risk-weighted assets [Abstract] |  |  |
Actual (in hundredths) |  | 14.64% |
For capital adequacy purposes (in hundredths) |  | 4.50% |
Non Consolidated |  |  |
Tier 2 capital to risk-weighted asets [Abstract] |  |  |
Actual | 162,355,000 | $ 151,487,000 |
For capital adequacy purposes | 86,063,000 | 77,928,000 |
To be well-capitalized under prompt corrective action provisions | 107,579,000 | 97,410,000 |
Tier 1 capital to risk-weighted assets [Abstract] |  |  |
Actual | 151,526,000 | 141,249,000 |
For capital adequacy purposes | 64,548,000 | 58,446,000 |
To be well-capitalized under prompt corrective action provisions | 86,063,000 | 77,928,000 |
Actual | 151,526,000 | 141,249,000 |
For capital adequacy purposes | 48,411,000 | 43,835,000 |
To be well-capitalized under prompt corrective action provisions | $ 69,926,000 | $ 63,317,000 |
Risk-weighted assets [Abstract] |  |  |
Actual (in hundredths) | 15.09% | 15.55% |
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) | 14.09% | 14.50% |
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) | 14.09% | 14.50% |
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 | $ 151,526,000 | $ 141,249,000 |
For capital adequacy purpose | 71,386,000 | 65,437,000 |
To be well-capitalized under prompt corrective action provisions | $ 89,233,000 | $ 81,797,000 |
Average assets [Abstract] |  |  |
Actual (in hundredths) | 8.49% | 8.63% |
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 | $ 163,943,000 | $ 152,802,000 |
For capital adequacy purposes | 86,070,000 | 77,928,000 |
Tier 1 capital to risk-weighted assets [Abstract] |  |  |
For capital adequacy purposes | 64,553,000 | $ 58,446,000 |
For capital adequacy purposes | $ 48,415,000 |  |
Risk-weighted assets [Abstract] |  |  |
Actual (in hundredths) | 15.24% | 15.69% |
For capital adequacy purposes (in hundredths) | 8.00% | 8.00% |
Actual (in hundredths) | 14.23% | 14.64% |
For capital adequacy purposes (in hundredths) | 6.00% | 6.00% |
Actual (in hundredths) | 14.23% |  |
For capital adequacy purposes (in hundredths) | 4.50% |  |
Tier 1 capital to average assets [Abstract] |  |  |
Actual | $ 153,114,000 | $ 142,564,000 |
For capital adequacy purpose | $ 71,435,000 | $ 65,470,000 |
Average assets [Abstract] |  |  |
Actual (in hundredths) | 8.57% | 8.71% |
For capital adequacy purpose (in hundredths) | 4.00% | 4.00% |

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- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 + Details
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- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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