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Loans - Schedule of Loan Assigned Risk Rating within 12 Months of Balance Sheet Date (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable recorded investment | $ 2,784,562 | $ 2,454,853
Commercial, industrial, and agricultural |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable recorded investment | 1,046,665 | 916,297
Commercial mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable recorded investment | 814,002 | 697,776
Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable recorded investment | 1,785,243 | 1,575,166
Pass | Commercial, industrial, and agricultural |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable recorded investment | 1,004,445 | 890,360
Pass | Commercial mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable recorded investment | 780,798 | 684,806
Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable recorded investment | 35,533 | 13,720
Special Mention | Commercial, industrial, and agricultural |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable recorded investment | 16,696 | 10,484
Special Mention | Commercial mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable recorded investment | 18,837 | 3,236
Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable recorded investment | 39,891 | 25,187
Substandard | Commercial, industrial, and agricultural |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable recorded investment | 25,524 | 15,453
Substandard | Commercial mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable recorded investment | 14,367 | 9,734
Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable recorded investment | 0 | 0
Doubtful | Commercial, industrial, and agricultural |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable recorded investment | 0 | 0
Doubtful | Commercial mortgages |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable recorded investment | 0 | 0
Total |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable recorded investment | $ 1,860,667 | $ 1,614,073

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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=118952595&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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