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Loans - Schedule of Loan Assigned Risk Rating within 12 Months of Balance Sheet Date (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | $ 2,454,853 | $ 2,126,266
Commercial, industrial, and agricultural |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 916,297 | 704,606
Commercial mortgages |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 697,776 | 644,597
Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 1,572,960 | 1,294,733
Pass | Commercial, industrial, and agricultural |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 889,547 | 668,570
Pass | Commercial mortgages |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 683,413 | 626,163
Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 13,760 | 21,145
Special Mention | Commercial, industrial, and agricultural |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 10,519 | 16,726
Special Mention | Commercial mortgages |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 3,241 | 4,419
Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 27,353 | 33,325
Substandard | Commercial, industrial, and agricultural |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 16,231 | 19,310
Substandard | Commercial mortgages |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 11,122 | 14,015
Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 0 | 0
Doubtful | Commercial, industrial, and agricultural |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 0 | 0
Doubtful | Commercial mortgages |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 0 | 0
Total |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | $ 1,614,073 | $ 1,349,203

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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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