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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, 2018 | Dec. 31, 2017
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | $ 17,239 | $ 19,232
Past Due Over 90 Days Still on Accrual | 890 | 664
Commercial, industrial, and agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 2,839 | 1,869
Past Due Over 90 Days Still on Accrual | 489 | 144
Commercial mortgages |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 7,694 | 11,065
Past Due Over 90 Days Still on Accrual | 53 | 0
Residential real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 6,023 | 5,470
Past Due Over 90 Days Still on Accrual | 299 | 429
Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 683 | 828
Past Due Over 90 Days Still on Accrual | 44 | 37
Credit cards |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 0 | 0
Past Due Over 90 Days Still on Accrual | $ 5 | $ 54

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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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