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Loans - Assigned Risk Rating within 12 Months of Balance Sheet Date (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Financing receivable recorded investment	$ 1,537,474	$ 1,349,203
Commercial, Industrial, and Agricultural
Financing Receivable, Recorded Investment [Line Items]
Financing receivable recorded investment	853,495	749,138
Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Financing receivable recorded investment	683,979	600,065
Pass
Financing Receivable, Recorded Investment [Line Items]
Financing receivable recorded investment	1,493,321	1,294,733
Pass | Commercial, Industrial, and Agricultural
Financing Receivable, Recorded Investment [Line Items]
Financing receivable recorded investment	827,425	713,102
Pass | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Financing receivable recorded investment	665,896	581,631
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Financing receivable recorded investment	13,613	21,145
Special Mention | Commercial, Industrial, and Agricultural
Financing Receivable, Recorded Investment [Line Items]
Financing receivable recorded investment	10,304	16,726
Special Mention | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Financing receivable recorded investment	3,309	4,419
Substandard
Financing Receivable, Recorded Investment [Line Items]
Financing receivable recorded investment	30,540	33,325
Substandard | Commercial, Industrial, and Agricultural
Financing Receivable, Recorded Investment [Line Items]
Financing receivable recorded investment	15,766	19,310
Substandard | Commercial mortgages
Financing Receivable, Recorded Investment [Line Items]
Financing receivable recorded investment	14,774	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

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- Definition

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+ References

No definition available.

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- Definition

Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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