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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
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Dec. 31, 2016 USD ($) Segment | Dec. 31, 2015 USD ($)
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |
Number of business segment | Segment | 1 |
Carrying value and maximum potential loss of equity investments | $ 0 | $ 0
Carrying value and maximum potential loss exposure of VIEs | 1,140,000 | 934,000
Special assets staff reviews loans, amount | $ 250,000 |
Loan payments delinquency period beyond which loan is considered non-accrual | 90 days |
TDRs evaluated for specific reserve based on collateral or net present value method | $ 250,000 |
TDRs subject to reserve based on historical loss rate | $ 250,000 |
Indemnified portion percentage | 80.00% |
Operating lease term | 20 years |
Investment in FHLB and FRB stock |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |
Investment owned, at cost | $ 10,600,000 | $ 10,730,000
Minimum |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |
Loan delinquent period | 30 days |
Furniture, Fixtures and Equipment | Minimum |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |
Premises and equipment, estimated useful life | 5 years |
Furniture, Fixtures and Equipment | Maximum |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |
Premises and equipment, estimated useful life | 10 years |
Software, Hardware, and Data Handling Equipment | Minimum |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |
Premises and equipment, estimated useful life | 3 years |
Software, Hardware, and Data Handling Equipment | Maximum |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |
Premises and equipment, estimated useful life | 5 years |
Building and Building Improvements | Minimum |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |
Premises and equipment, estimated useful life | 10 years |
Building and Building Improvements | Maximum |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |
Premises and equipment, estimated useful life | 40 years |
Land Improvements |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |
Premises and equipment, estimated useful life | 20 years |
Consumer Loan |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |
Loans charged against the allowance for loan losses, past due days | 120 days |
Consumer Loan | Residential Real Estate |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |
Loans charged against the allowance for loan losses, past due days | 180 days |
Other Loans |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |
Loans charged against the allowance for loan losses, past due days | 120 days |
Unsecured Loan | Consumer Loan |  |
Basis Of Presentation And Significant Accounting Policies [Line Items] |  |
Loans charged against the allowance for loan losses, past due days | 90 days |

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- Definition Minimum Principal Balance of Loans Subject to Reserve Based on Collateral or Net Present Value Method + References No definition available. + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Difference between the carrying amount of assets and liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the variable interest entity (VIE) and the reporting entity's maximum exposure to loss as a result of its involvement with the VIE, where the reporting entity is not the VIE's primary beneficiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5728-111685 + Details
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