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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, 2016 | Dec. 31, 2015
Federal Funds Purchased [Member] |  |
Short-term Debt [Line Items] |  |
Maximum indebtedness | $ 20,000,000 |
Average balance | $ 157,000 | $ 69,000
Average rate paid | 0.79% | 0.53%
Short Term Borrowings [Member] |  |
Short-term Debt [Line Items] |  |
Outstanding balance | $ 17,500,000 | $ 53,700,000
Maximum indebtedness | 70,400,000 | 64,700,000
Average balance | $ 13,290,000 | $ 26,880,000
Average rate paid | 0.42% | 0.20%
Interest rate on balance | 0.40% | 0.35%

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