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Loans - Schedule of Net Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Loan Portfolio By Loan Grade [Line Items] |  |
Loans | $ 2,809,197 | $ 2,479,348
Less: unearned discount | (5,162) | (4,791)
allowance for loan losses | (19,473) | (19,704)
Net loans | 2,784,562 | 2,454,853
Commercial, industrial, and agricultural |  |
Loan Portfolio By Loan Grade [Line Items] |  |
Loans | 1,046,665 | 916,297
Net loans | 1,046,665 | 916,297
Commercial mortgages |  |
Loan Portfolio By Loan Grade [Line Items] |  |
Loans | 814,002 | 697,776
Net loans | 814,002 | 697,776
Residential real estate |  |
Loan Portfolio By Loan Grade [Line Items] |  |
Loans | 814,030 | 771,309
Consumer |  |
Loan Portfolio By Loan Grade [Line Items] |  |
Loans | 124,785 | 86,035
Credit cards |  |
Loan Portfolio By Loan Grade [Line Items] |  |
Loans | 7,569 | 7,623
Overdrafts |  |
Loan Portfolio By Loan Grade [Line Items] |  |
Loans | $ 2,146 | $ 308

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