Loans - Investment in Loans by Portfolio Segment and Based on Impairment (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance, Beginning balance	$ 17,712	$ 17,687
Provision (recovery) for loan losses	2,155	(184)
Charge-offs	(3,187)	(712)
Recoveries	223	430
Allowance, Ending balance	16,903	17,221
Allowance, Loans individually evaluated for impairment	3,022	3,193	$ 2,816
Allowance, Loans collectively evaluated for impairment	13,881		14,896
Period-end balances, Loans individually evaluated for impairment	42,611		39,659
Period-end balances, Loans collectively evaluated for impairment	1,332,019		1,292,934
Total loans	1,374,630		1,332,593
Commercial Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance, Beginning balance	8,077	5,690
Provision (recovery) for loan losses	2,724	158
Charge-offs	(2,346)	(15)
Recoveries	66	112
Allowance, Ending balance	8,521	5,945
Allowance, Loans individually evaluated for impairment	1,029	682	568
Allowance, Loans collectively evaluated for impairment	7,492		7,509
Period-end balances, Loans individually evaluated for impairment	14,180		9,698
Period-end balances, Loans collectively evaluated for impairment	392,732		360,054
Total loans	406,912		369,752
Residential Mortgage Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance, Beginning balance	6,630	8,517
Provision (recovery) for loan losses	(594)	(871)
Charge-offs	(362)	(166)
Recoveries	62	186
Allowance, Ending balance	5,736	7,666
Allowance, Loans individually evaluated for impairment	1,407	1,707	1,541
Allowance, Loans collectively evaluated for impairment	4,329		5,089
Period-end balances, Loans individually evaluated for impairment	18,791		19,348
Period-end balances, Loans collectively evaluated for impairment	761,604		755,235
Total loans	780,395		774,583
Consumer Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance, Beginning balance	3,005	3,480
Provision (recovery) for loan losses	25	529
Charge-offs	(479)	(531)
Recoveries	95	132
Allowance, Ending balance	2,646	3,610
Allowance, Loans individually evaluated for impairment	586	$ 804	707
Allowance, Loans collectively evaluated for impairment	2,060		2,298
Period-end balances, Loans individually evaluated for impairment	9,640		10,613
Period-end balances, Loans collectively evaluated for impairment	177,683		177,645
Total loans	$ 187,323		$ 188,258

Provision for recovery of loan losses.

No definition available.

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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

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- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

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- Definition

The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section L
-Subsection 1

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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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