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Short-Term Borrowings - Summary of Federal Funds Purchased and Other Short-term Borrowings (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Federal Funds Purchased [Member]    
Short-term Debt [Line Items]    
Maximum indebtedness $ 25,000,000  
Average balance $ 93,000 $ 41,000
Average rate paid 0.54% 0.54%
Interest rate on balance 0.00%  
Short Term Borrowings [Member]    
Short-term Debt [Line Items]    
Outstanding balance $ 54,700,000 $ 42,700,000
Maximum indebtedness 64,700,000 42,700,000
Average balance $ 21,938,000 $ 1,951,000
Average rate paid 0.18% 0.19%
Interest rate on balance 0.19% 0.14%