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Off Balance Sheet Activities - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Feb. 28, 2017 | Sep. 30, 2016 | Oct. 31, 2015
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items] |  |  |  |  |
Commitments to make loans periods | 60 days or less |  |  |  |
Fixed Interest rate loan |  |  |  | 5.75% |
Subscription Agreement [Member] | Oxer [Member] |  |  |  |  |
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items] |  |  |  |  |
Capital contributions | $ 3,290 |  |  |  |
Subscription Agreement [Member] | Oxer [Member] | Commitments to Invest [Member] |  |  |  |  |
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items] |  |  |  |  |
Off-balance sheet risks, amount, liability |  |  |  |  | $ 5,000
Subscription Agreement [Member] | Tecum [Member] |  |  |  |  |
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items] |  |  |  |  |
Capital contributions | $ 1,167 |  |  |  |
Subscription Agreement [Member] | Tecum [Member] | Commitments to Invest [Member] |  |  |  |  |
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items] |  |  |  |  |
Off-balance sheet risks, amount, liability |  |  | $ 3,000 |  |
Minimum [Member] |  |  |  |  |
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items] |  |  |  |  |
Fixed Interest rate loan | 1.00% | 1.19% |  |  |
Fixed rate loan Maturities range | 8 months | 6 months |  |  |
Maximum [Member] |  |  |  |  |
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items] |  |  |  |  |
Fixed Interest rate loan | 18.00% | 18.00% |  |  |
Fixed rate loan Maturities range | 30 years | 30 years |  |  |

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