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Federal Home Loan Bank Advances - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Advances from FHLB	$ 15,000	$ 17,500
Maturities, year from	2018
Maturities, year to	2019
Outstanding letters of credit with FHLB	$ 19,600	19,600
FHLB borrowings collateralized by residential mortgage loans	137,250	$ 102,150
FHLB maximum borrowing capacity	366,122
FHLB remaining borrowing capacity	$ 274,622
Minimum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Maturities from February 2018 through October 2019, fixed rates	1.50%
Maximum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Maturities from February 2018 through October 2019, fixed rates	2.10%
Weighted Average [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Maturities from February 2018 through October 2019, fixed rates	1.70%

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- Definition

Discloses the earliest year of maturity for the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

+ References

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-Publisher FASB
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Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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