Loans - Investment in Loans by Portfolio Segment and Based on Impairment (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance, Beginning balance	$ 17,172	$ 16,881	$ 17,712	$ 17,687
Provision (recovery) for loan losses	1,344	673	3,894	1,242
Charge-offs	(921)	(513)	(4,615)	(2,691)
Recoveries	639	441	1,243	1,244
Allowance, Ending balance	18,234	17,482	18,234	17,482
Allowance, Loans individually evaluated for impairment	2,874	2,970	2,874	2,970	$ 2,816
Allowance, Loans collectively evaluated for impairment	15,360		15,360		14,896
Period-end balances, Loans individually evaluated for impairment	40,253		40,253		39,659
Period-end balances, Loans collectively evaluated for impairment	1,449,549		1,449,549		1,292,934
Total loans	1,489,802		1,489,802		1,332,593
Commercial Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance, Beginning balance	8,958	6,389	8,077	5,690
Provision (recovery) for loan losses	842	1,375	4,055	2,548
Charge-offs	(533)	(252)	(3,026)	(1,047)
Recoveries	527	189	688	510
Allowance, Ending balance	9,794	7,701	9,794	7,701
Allowance, Loans individually evaluated for impairment	1,016	629	1,016	629	568
Allowance, Loans collectively evaluated for impairment	8,778		8,778		7,509
Period-end balances, Loans individually evaluated for impairment	13,697		13,697		9,698
Period-end balances, Loans collectively evaluated for impairment	480,486		480,486		360,054
Total loans	494,183		494,183		369,752
Residential Mortgage Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance, Beginning balance	5,644	7,082	6,630	8,517
Provision (recovery) for loan losses	268	(348)	(359)	(1,498)
Charge-offs	(166)	(83)	(612)	(576)
Recoveries	20	66	107	274
Allowance, Ending balance	5,766	6,717	5,766	6,717
Allowance, Loans individually evaluated for impairment	1,342	1,596	1,342	1,596	1,541
Allowance, Loans collectively evaluated for impairment	4,424		4,424		5,089
Period-end balances, Loans individually evaluated for impairment	17,848		17,848		19,348
Period-end balances, Loans collectively evaluated for impairment	773,920		773,920		755,235
Total loans	791,768		791,768		774,583
Consumer Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance, Beginning balance	2,570	3,410	3,005	3,480
Provision (recovery) for loan losses	234	(354)	198	192
Charge-offs	(222)	(178)	(977)	(1,068)
Recoveries	92	186	448	460
Allowance, Ending balance	2,674	3,064	2,674	3,064
Allowance, Loans individually evaluated for impairment	516	$ 745	516	$ 745	707
Allowance, Loans collectively evaluated for impairment	2,158		2,158		2,298
Period-end balances, Loans individually evaluated for impairment	8,708		8,708		10,613
Period-end balances, Loans collectively evaluated for impairment	195,143		195,143		177,645
Total loans	$ 203,851		$ 203,851		$ 188,258

Provision for recovery of loan losses.

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- Definition

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

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

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

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The balance of financing receivables that were collectively 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

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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.

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