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Summary of Significant Accounting Policies - Reclassifications of Accumulated Other Comprehensive Income (Loss) Items (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]    
Other comprehensive income $ 408 $ 1,014
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Unrealized holding gains on securities available for sale during the period, Pre-tax 693 1,715
Unrealized holding gains on securities available for sale during the period, Tax (283) (701)
Unrealized holding gains on securities available for sale during the period, After-tax 410 1,014
Reclassification adjustment for net gains included in net income, Pre-tax (4)  
Reclassification adjustment for net gains included in net income, Tax 2  
Reclassification adjustment for net gains included in net income, After-tax (2)  
Net unrealized gain on securities available for sale, Pre-tax 689 1,715
Net unrealized gain on securities available for sale, Tax (281) (701)
Other comprehensive income $ 408 $ 1,014