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Loans - Nonaccrual Loans and Loans Past Due over 90 Days Still Accruing Interest by Class of Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | $ 21,736 | $ 14,262
Past Due Over 90 Days Still on Accrual | 61 | 887
Commercial, industrial, and agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 11,644 | 2,076
Past Due Over 90 Days Still on Accrual | 0 | 487
Commercial mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 4,533 | 6,329
Past Due Over 90 Days Still on Accrual | 0 | 53
Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 4,724 | 5,187
Past Due Over 90 Days Still on Accrual | 59 | 299
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 835 | 670
Past Due Over 90 Days Still on Accrual | 0 | 43
Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual | 0 | 0
Past Due Over 90 Days Still on Accrual | $ 2 | $ 5

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