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Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	$ 168		$ 278
Allowance for loan losses, Collectively evaluated for impairment	13,137		13,547
Allowance for loan losses, Modified in a troubled debt restructuring	2,683		2,912
Acquired with deteriorated credit quality	15,988	$ 16,738	16,737	$ 17,504	$ 17,682	$ 17,373
Loans:
Loans individually evaluated for impairment	930		1,837
Loans collectively evaluated for impairment	1,643,905		1,564,891
Acquired with deteriorated credit quality	985,457		923,543
Loans modified in a troubled debt restructuring	14,086		14,941
Total ending loans balance	1,659,591		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	670		685
Commercial, Industrial, and Agricultural [Member]
Ending allowance balance attributable to loans:
Allowance for loan losses, Individually evaluated for impairment	168		239
Allowance for loan losses, Collectively evaluated for impairment	4,428		4,909
Allowance for loan losses, Modified in a troubled debt restructuring	622		887
Acquired with deteriorated credit quality	5,218	5,627	6,035	6,598	7,223	7,114
Loans:
Loans individually evaluated for impairment	930		1,196
Loans collectively evaluated for impairment	485,393		469,128
Acquired with deteriorated credit quality	490,838		475,364
Loans modified in a troubled debt restructuring	4,515		5,040
Total ending loans balance	490,838		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	4,146		3,580
Allowance for loan losses, Modified in a troubled debt restructuring	2,061		2,025
Acquired with deteriorated credit quality	6,207	6,044	5,605	5,928	5,296	5,310
Loans:
Loans individually evaluated for impairment	0		393
Loans collectively evaluated for impairment	484,378		437,200
Acquired with deteriorated credit quality	494,619		448,179
Loans modified in a troubled debt restructuring	9,571		9,901
Total ending loans balance	494,619		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	670		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	2,299		2,436
Allowance for loan losses, Modified in a troubled debt restructuring	0		0
Acquired with deteriorated credit quality	2,299	2,574	2,475	2,612	2,786	2,479
Loans:
Loans individually evaluated for impairment	0		248
Loans collectively evaluated for impairment	591,779		573,977
Loans modified in a troubled debt restructuring	0		0
Total ending loans balance	591,779		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	2,066		2,371
Allowance for loan losses, Modified in a troubled debt restructuring	0		0
Acquired with deteriorated credit quality	2,066	2,274	2,371	2,118	2,129	2,205
Loans:
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	76,619		78,345
Loans modified in a troubled debt restructuring	0		0
Total ending loans balance	76,619		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	50		90
Allowance for loan losses, Modified in a troubled debt restructuring	0		0
Acquired with deteriorated credit quality	50	81	90	98	74	71
Loans:
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	5,329		5,201
Loans modified in a troubled debt restructuring	0		0
Total ending loans balance	5,329		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	148		161
Allowance for loan losses, Modified in a troubled debt restructuring	0		0
Acquired with deteriorated credit quality	148	$ 138	161	$ 150	$ 174	$ 194
Loans:
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	407		1,040
Loans modified in a troubled debt restructuring	0		0
Total ending loans balance	407		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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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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