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Short-term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 117,373 | $ 201,853 | $ 721,823
Average Balance | $ 142,634 | $ 391,547 | $ 618,957
Average Rate | 0.49% | 2.12% | 1.74%
Federal funds purchased |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 0 | $ 0 | $ 11,000
Average Balance | $ 4,147 | $ 8,069 | $ 8,801
Average Rate | 1.06% | 2.53% | 2.05%
Borrowings from FHLB |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 0 | $ 136,200 | $ 565,000
Average Balance | $ 28,252 | $ 278,930 | $ 467,594
Average Rate | 1.54% | 2.62% | 2.12%
Securities sold under agreements to repurchase |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 117,373 | $ 65,653 | $ 145,823
Average Balance | $ 110,235 | $ 104,548 | $ 142,562
Average Rate | 0.21% | 0.75% | 0.44%
Maximum [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 248,471 | $ 670,831 | $ 811,026
Weighted Average [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Average Rate | 0.10% | 1.41% | 2.17%

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