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Short-Term and Other Borrowings - Summary of Federal Funds Purchased, Securities Sold Under Agreements to Repurchase and Other Short-term Borrowings (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2020
Federal Funds Purchased [Member] |  |
Short-term Debt [Line Items] |  |
Maximum indebtedness | $ 35,000,000 | $ 50,000,000
Average balance | $ 543,000 | $ 385,000
Average rate paid | (1.47%) | 0.35%
Short Term Borrowings, FHLB advances [Member] |  |
Short-term Debt [Line Items] |  |
Maximum indebtedness |  | $ 102,700,000
Average balance |  | $ 10,888,000
Average rate paid |  | 1.64%

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