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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		6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended	6 Months Ended					3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Commercial [Member]	Jun. 30, 2013 Commercial [Member]	Jun. 30, 2014 Commercial [Member]	Jun. 30, 2013 Commercial [Member]	Dec. 31, 2013 Commercial [Member]	Jun. 30, 2014 Real Estate Commercial [Member]	Jun. 30, 2014 Real Estate Commercial [Member]	Dec. 31, 2013 Real Estate Commercial [Member]	Jun. 30, 2013 Real Estate Commercial [Member]	Mar. 31, 2013 Real Estate Commercial [Member]	Dec. 31, 2012 Real Estate Commercial [Member]	Jun. 30, 2014 Real Estate Residential [Member]	Jun. 30, 2013 Real Estate Residential [Member]	Jun. 30, 2014 Real Estate Residential [Member]	Jun. 30, 2013 Real Estate Residential [Member]	Dec. 31, 2013 Real Estate Residential [Member]	Jun. 30, 2014 Consumer [Member]	Jun. 30, 2013 Consumer [Member]	Jun. 30, 2014 Consumer [Member]	Jun. 30, 2013 Consumer [Member]	Dec. 31, 2013 Consumer [Member]	Jun. 30, 2014 Unallocated [Member]	Dec. 31, 2013 Unallocated [Member]
Allowance for loan losses:
Beginning Balance	$ 8,859	$ 7,110	$ 8,651	$ 6,950		$ 1,961	$ 799	$ 2,008	$ 799		$ 2,473	$ 2,394		$ 2,304	$ 2,304	$ 2,304	$ 3,248	$ 3,100	$ 3,135	$ 2,981		$ 1,177	$ 907	$ 1,114	$ 866
Charge-offs	(790)	(102)	(1,473)	(324)		(29)		(376)			(404)	(432)					(270)	(51)	(510)	(207)		(87)	(51)	(155)	(117)
Recoveries	352	44	386	126		1		1			269	269					35	41	38	106		47	3	78	20
Provisions	1,201	500	2,058	800		268	400	568	400		337	444					445	2	795	212		151	98	251	188
Ending balance	9,622	7,552	9,622	7,552		2,201	1,199	2,201	1,199		2,675	2,675		2,304	2,304	2,304	3,458	3,092	3,458	3,092		1,288	957	1,288	957
Ending balance: individually evaluated for impairment	1,846		1,846		2,024	1,157		1,157		1,500	527	527	300				162		162		224
Ending balance: collectively evaluated for impairment	7,776		7,776		6,627	1,044		1,044		508	2,148	2,148	2,094				3,296		3,296		2,911	1,288		1,288		1,114
Ending balance: loans acquired with deteriorated credit quality
Loans receivable:
Ending balance	1,179,847		1,179,847		1,176,617	337,033		337,033		350,680	439,942	439,942	413,058				317,929		317,929		322,062	84,943		84,943		90,817
Ending balance: individually evaluated for impairment	13,082		13,082		15,626	2,859		2,859		4,504	7,210	7,210	7,711				2,916		2,916		3,321	97		97		90
Ending balance: collectively evaluated for impairment	1,161,081		1,161,081		1,153,671	332,627		332,627		343,502	428,656	428,656	401,168				314,952		314,952		318,274	84,846		84,846		90,727
Ending balance: loans acquired with deteriorated credit quality	$ 5,684		$ 5,684		$ 7,320	$ 1,547		$ 1,547		$ 2,674	$ 4,076	$ 4,076	$ 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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