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Short-term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 201,853 | $ 721,823 | $ 707,466
Average Balance | $ 391,547 | $ 618,957 | $ 867,391
Average Rate | 2.12% | 1.74% | 1.01%
Federal funds purchased |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 0 | $ 11,000 | $ 0
Average Balance | $ 8,069 | $ 8,801 | $ 6,225
Average Rate | 2.53% | 2.05% | 1.24%
Borrowings from FHLB |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 136,200 | $ 565,000 | $ 567,500
Average Balance | $ 278,930 | $ 467,594 | $ 710,932
Average Rate | 2.62% | 2.12% | 1.18%
Securities sold under agreements to repurchase |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 65,653 | $ 145,823 | $ 139,966
Average Balance | $ 104,548 | $ 142,562 | $ 150,234
Average Rate | 0.75% | 0.44% | 0.24%
Maximum [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 670,831 | $ 811,026 | $ 967,259
Weighted Average [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Average Rate | 1.41% | 2.17% | 1.27%

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