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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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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

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