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Short-Term Borrowings - Summary of Federal Funds Purchased and Other Short-term Borrowings are Included in Federal Home Loan Bank Advances on Consolidated Balance Sheets (Detail) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Federal Funds Purchased [Member] |  |
Short-term Debt [Line Items] |  |
Maximum indebtedness | $ 22,500,000 | $ 20,000,000
Average balance | $ 156,000 | $ 116,000
Average rate paid | 1.71% | 0.86%
Short Term Borrowings [Member] |  |
Short-term Debt [Line Items] |  |
Outstanding balance | $ 41,750,000 | $ 31,000,000
Maximum indebtedness | 115,050,000 | 70,400,000
Average balance | $ 42,102,000 | $ 10,483,000
Average rate paid | 1.08% | 0.42%
Interest rate on balance | 1.17% | 0.64%

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