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Short-term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 138,315 | $ 117,373 | $ 201,853
Average Balance | $ 119,801 | $ 142,634 | $ 391,547
Average Rate | 0.08% | 0.49% | 2.12%
Federal funds purchased |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 0 | $ 0 | $ 0
Average Balance | $ 0 | $ 4,147 | $ 8,069
Average Rate | 0.00% | 1.06% | 2.53%
Borrowings from FHLB |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 0 | $ 0 | $ 136,200
Average Balance | $ 0 | $ 28,252 | $ 278,930
Average Rate | 0.00% | 1.54% | 2.62%
Securities sold under agreements to repurchase |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 138,315 | $ 117,373 | $ 65,653
Average Balance | $ 119,801 | $ 110,235 | $ 104,548
Average Rate | 0.08% | 0.21% | 0.75%
Maximum [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 138,315 | $ 248,471 | $ 670,831
Weighted Average [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Average Rate | 0.06% | 0.10% | 1.41%

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