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Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	$ 193		$ 278
Allowance for loan losses, Collectively evaluated for impairment	12,957		13,547
Allowance for loan losses, Modified in a troubled debt restructuring	2,553		2,912
Acquired with deteriorated credit quality	15,703	$ 15,988	16,737	$ 17,236	$ 17,504	$ 17,373
Loans:
Loans individually evaluated for impairment	820		1,837
Loans collectively evaluated for impairment	1,790,920		1,564,891
Acquired with deteriorated credit quality	1,076,607		923,543
Loans modified in a troubled debt restructuring	12,072		14,941
Total ending loans balance	1,804,472		1,582,354
Receivables Acquired with Deteriorated Credit Quality [Member]
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0		0
Loans:
Acquired with deteriorated credit quality	660		685
Commercial, Industrial, and Agricultural [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	193		239
Allowance for loan losses, Collectively evaluated for impairment	4,824		4,909
Allowance for loan losses, Modified in a troubled debt restructuring	128		887
Acquired with deteriorated credit quality	5,145	5,218	6,035	6,619	6,598	7,114
Loans:
Loans individually evaluated for impairment	820		1,196
Loans collectively evaluated for impairment	565,737		469,128
Acquired with deteriorated credit quality	569,267		475,364
Loans modified in a troubled debt restructuring	2,710		5,040
Total ending loans balance	569,267		475,364
Commercial, Industrial, and Agricultural [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0		0
Loans:
Acquired with deteriorated credit quality	0		0
Commercial Mortgages [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	0		0
Allowance for loan losses, Collectively evaluated for impairment	3,811		3,580
Allowance for loan losses, Modified in a troubled debt restructuring	2,425		2,025
Acquired with deteriorated credit quality	6,236	6,207	5,605	5,545	5,928	5,310
Loans:
Loans individually evaluated for impairment	0		393
Loans collectively evaluated for impairment	497,318		437,200
Acquired with deteriorated credit quality	507,340		448,179
Loans modified in a troubled debt restructuring	9,362		9,901
Total ending loans balance	507,340		448,179
Commercial Mortgages [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0		0
Loans:
Acquired with deteriorated credit quality	660		685
Residential Real Estate [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	0		39
Allowance for loan losses, Collectively evaluated for impairment	2,149		2,436
Allowance for loan losses, Modified in a troubled debt restructuring	0		0
Acquired with deteriorated credit quality	2,149	2,299	2,475	2,540	2,612	2,479
Loans:
Loans individually evaluated for impairment	0		248
Loans collectively evaluated for impairment	644,545		573,977
Loans modified in a troubled debt restructuring	0		0
Total ending loans balance	644,545		574,225
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0		0
Loans:
Acquired with deteriorated credit quality	0		0
Consumer [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	0		0
Allowance for loan losses, Collectively evaluated for impairment	1,922		2,371
Allowance for loan losses, Modified in a troubled debt restructuring	0		0
Acquired with deteriorated credit quality	1,922	2,066	2,371	2,276	2,118	2,205
Loans:
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	77,405		78,345
Loans modified in a troubled debt restructuring	0		0
Total ending loans balance	77,405		78,345
Consumer [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0		0
Loans:
Acquired with deteriorated credit quality	0		0
Credit Cards [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	0		0
Allowance for loan losses, Collectively evaluated for impairment	72		90
Allowance for loan losses, Modified in a troubled debt restructuring	0		0
Acquired with deteriorated credit quality	72	50	90	98	98	71
Loans:
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	5,842		5,201
Loans modified in a troubled debt restructuring	0		0
Total ending loans balance	5,842		5,201
Credit Cards [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0		0
Loans:
Acquired with deteriorated credit quality	0		0
Overdrafts [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	0		0
Allowance for loan losses, Collectively evaluated for impairment	179		161
Allowance for loan losses, Modified in a troubled debt restructuring	0		0
Acquired with deteriorated credit quality	179	$ 148	161	$ 158	$ 150	$ 194
Loans:
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	73		1,040
Loans modified in a troubled debt restructuring	0		0
Total ending loans balance	73		1,040
Overdrafts [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Ending allowance balance attributable to loans:
Acquired with deteriorated credit quality	0		0
Loans:
Acquired with deteriorated credit quality	$ 0		$ 0

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Allowance for loan losses ending allowance balance attributable to loans.

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A valuation allowance for financing receivables that are expected to be uncollectible.

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

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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. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

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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.

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