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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, 2018 | Dec. 31, 2017
Federal Funds Purchased [Member] |  |
Short-term Debt [Line Items] |  |
Maximum indebtedness |  | $ 20,000,000
Average balance |  | $ 119,000
Average rate paid |  | 1.68%
Short Term Borrowings [Member] |  |
Short-term Debt [Line Items] |  |
Outstanding balance | $ 140,100,000 | $ 56,900,000
Maximum indebtedness | 225,300,000 | 115,050,000
Average balance | $ 101,010,000 | $ 38,825,000
Average rate paid | 1.94% | 1.12%
Interest rate on balance | 2.21% | 1.42%

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