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Loans, net and allowance for loan losses - Changes in Allowance for Loan Losses Account by Major Classification of Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended					3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Commercial [Member]	Sep. 30, 2013 Commercial [Member]	Sep. 30, 2014 Commercial [Member]	Sep. 30, 2013 Commercial [Member]	Dec. 31, 2013 Commercial [Member]	Sep. 30, 2014 Real Estate Commercial [Member]	Sep. 30, 2014 Real Estate Commercial [Member]	Dec. 31, 2013 Real Estate Commercial [Member]	Sep. 30, 2013 Real Estate Commercial [Member]	Jun. 30, 2013 Real Estate Commercial [Member]	Dec. 31, 2012 Real Estate Commercial [Member]	Sep. 30, 2014 Real Estate Residential [Member]	Sep. 30, 2013 Real Estate Residential [Member]	Sep. 30, 2014 Real Estate Residential [Member]	Sep. 30, 2013 Real Estate Residential [Member]	Dec. 31, 2013 Real Estate Residential [Member]	Sep. 30, 2014 Consumer [Member]	Sep. 30, 2013 Consumer [Member]	Sep. 30, 2014 Consumer [Member]	Sep. 30, 2013 Consumer [Member]	Dec. 31, 2013 Consumer [Member]	Sep. 30, 2014 Unallocated [Member]	Dec. 31, 2013 Unallocated [Member]
Allowance for loan losses:
Beginning Balance	$ 9,622	$ 7,552	$ 8,651	$ 6,950		$ 2,201	$ 1,199	$ 2,008	$ 799		$ 2,675	$ 2,394		$ 2,304	$ 2,304	$ 2,304	$ 3,458	$ 3,092	$ 3,135	$ 2,981		$ 1,288	$ 957	$ 1,114	$ 866
Charge-offs	(177)	(216)	(1,650)	(540)			(5)	(376)	(5)		(57)	(489)					(56)	(168)	(566)	(375)		(64)	(43)	(219)	(160)
Recoveries	60	10	446	136		5		6			22	291						5	38	111		33	5	111	25
Provisions	666	525	2,724	1,325		152	513	720	913		185	629					239	(98)	1,034	114		90	110	341	298
Ending balance	10,171	7,871	10,171	7,871		2,358	1,707	2,358	1,707		2,825	2,825		2,304	2,304	2,304	3,641	2,831	3,641	2,831		1,347	1,029	1,347	1,029
Ending balance: individually evaluated for impairment	2,115		2,115		2,024	1,163		1,163		1,500	660	660	300				275		275		224	17		17
Ending balance: collectively evaluated for impairment	8,056		8,056		6,627	1,195		1,195		508	2,165	2,165	2,094				3,366		3,366		2,911	1,330		1,330		1,114
Ending balance: loans acquired with deteriorated credit quality
Loans receivable:
Ending balance	1,179,942		1,179,942		1,176,617	323,312		323,312		350,680	456,153	456,153	413,058				315,082		315,082		322,062	85,395		85,395		90,817
Ending balance: individually evaluated for impairment	13,919		13,919		15,626	2,721		2,721		4,504	7,799	7,799	7,711				3,318		3,318		3,321	81		81		90
Ending balance: collectively evaluated for impairment	1,163,181		1,163,181		1,153,671	319,179		319,179		343,502	446,985	446,985	401,168				311,703		311,703		318,274	85,314		85,314		90,727
Ending balance: loans acquired with deteriorated credit quality	$ 2,842		$ 2,842		$ 7,320	$ 1,412		$ 1,412		$ 2,674	$ 1,369	$ 1,369	$ 4,179				$ 61		$ 61		$ 467

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The balance of financing receivables that were acquired with deteriorated credit quality.

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Amount before allowance and after 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. Excludes loans and leases covered under loss sharing agreements.

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