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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 ($) | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Federal Funds Purchased [Member] |  |
Short-term Debt [Line Items] |  |
Maximum indebtedness | $ 37,000,000 |
Average balance | $ 610,000 |
Average rate paid | 1.32% |
Short Term Borrowings, FHLB advances [Member] |  |
Short-term Debt [Line Items] |  |
Outstanding balance | $ 17,000,000 | $ 122,100,000
Interest rate on balance | 0.14% | 2.51%
Maximum indebtedness | $ 102,700,000 | $ 192,700,000
Average balance | $ 32,749,000 | $ 92,267,000
Average rate paid | 1.65% | 2.51%

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