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Loans, net and allowance for loan losses - Summarize Information in Concerning to Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance, Total	$ 15,365	$ 2,128	$ 15,365	$ 2,128	$ 18,568
Unpaid Principal Balance, With no related allowance, Total	20,094	2,128	20,094	2,128	26,353
Average Recorded Investment, With no related allowance, Total	15,101	1,661	15,897	1,684	18,628
Recorded Investment, With an allowance recorded, Total	3,401	2,720	3,401	2,720	4,378
Interest Income Recognized, With no related allowance, Total	48		92
Unpaid Principal Balance, With an allowance recorded, Total	3,401	2,720	3,401	2,720	4,378
Related Allowance, With an allowance recorded, Total	1,846	1,174	1,846	1,174	2,024
Average Recorded Investment, With an allowance recorded, Total	3,397	3,024	3,640	3,210	4,263
Interest Income Recognized, With an allowance recorded, Total	37	30	72	56	184
Recorded Investment, Total	18,766	4,848	18,766	4,848	22,946
Unpaid Principal Balance, Total	23,495	4,848	23,495	4,848	30,731
Related Allowance, With an allowance recorded, Total	1,846	1,174	1,846	1,174	2,024
Average Recorded Investment, Total	18,498	4,685	19,537	4,894	22,891
Interest Income Recognized, Total	85	30	164	56	184
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance, Total	2,649	325	2,649	325	4,978
Unpaid Principal Balance, With no related allowance, Total	4,470	325	4,470	325	9,474
Average Recorded Investment, With no related allowance, Total	2,329	239	2,908	280	5,824
Recorded Investment, With an allowance recorded, Total	1,757	612	1,757	612	2,200
Interest Income Recognized, With no related allowance, Total	28		52
Unpaid Principal Balance, With an allowance recorded, Total	1,757	612	1,757	612	2,200
Related Allowance, With an allowance recorded, Total	1,157	612	1,157	612	1,500
Average Recorded Investment, With an allowance recorded, Total	1,743	712	1,853	532	2,182
Interest Income Recognized, With an allowance recorded, Total	23	8	43	12	95
Recorded Investment, Total	4,406	937	4,406	937	7,178
Unpaid Principal Balance, Total	6,227	937	6,227	937	11,674
Related Allowance, With an allowance recorded, Total	1,157	612	1,157	612	1,500
Average Recorded Investment, Total	4,072	951	4,761	812	8,006
Interest Income Recognized, Total	51	8	95	12	95
Real Estate Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance, Total	9,899	314	9,899	314	10,496
Unpaid Principal Balance, With no related allowance, Total	12,619	314	12,619	314	13,352
Average Recorded Investment, With no related allowance, Total	9,929	370	10,077	287	10,095
Recorded Investment, With an allowance recorded, Total	1,387	1,443	1,387	1,443	1,394
Interest Income Recognized, With no related allowance, Total	19		38
Unpaid Principal Balance, With an allowance recorded, Total	1,387	1,443	1,387	1,443	1,394
Related Allowance, With an allowance recorded, Total	527	300	527	300	300
Average Recorded Investment, With an allowance recorded, Total	1,395	1,162	1,397	1,445	1,409
Interest Income Recognized, With an allowance recorded, Total	14	19	29	38	76
Recorded Investment, Total	11,286	1,757	11,286	1,757	11,890
Unpaid Principal Balance, Total	14,006	1,757	14,006	1,757	14,746
Related Allowance, With an allowance recorded, Total	527	300	527	300	300
Average Recorded Investment, Total	11,324	1,532	11,474	1,732	11,504
Interest Income Recognized, Total	33	19	67	38	76
Real Estate Residential [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance, Total	2,720	1,437	2,720	1,437	3,004
Unpaid Principal Balance, With no related allowance, Total	2,908	1,437	2,908	1,437	3,437
Average Recorded Investment, With no related allowance, Total	2,730	970	2,801	1,047	2,614
Recorded Investment, With an allowance recorded, Total	257	665	257	665	784
Interest Income Recognized, With no related allowance, Total	1		2
Unpaid Principal Balance, With an allowance recorded, Total	257	665	257	665	784
Related Allowance, With an allowance recorded, Total	162	262	162	262	224
Average Recorded Investment, With an allowance recorded, Total	259	1,150	390	1,233	672
Interest Income Recognized, With an allowance recorded, Total		3		6	13
Recorded Investment, Total	2,977	2,102	2,977	2,102	3,788
Unpaid Principal Balance, Total	3,165	2,102	3,165	2,102	4,221
Related Allowance, With an allowance recorded, Total	162	262	162	262	224
Average Recorded Investment, Total	2,989	2,120	3,191	2,280	3,286
Interest Income Recognized, Total	1	3	2	6	13
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment, With no related allowance, Total	97	52	97	52	90
Unpaid Principal Balance, With no related allowance, Total	97	52	97	52	90
Average Recorded Investment, With no related allowance, Total	113	82	111	70	95
Recorded Investment, With an allowance recorded, Total
Interest Income Recognized, With no related allowance, Total
Unpaid Principal Balance, With an allowance recorded, Total
Related Allowance, With an allowance recorded, Total
Average Recorded Investment, With an allowance recorded, Total
Interest Income Recognized, With an allowance recorded, Total
Recorded Investment, Total	97	52	97	52	90
Unpaid Principal Balance, Total	97	52	97	52	90
Related Allowance, With an allowance recorded, Total
Average Recorded Investment, Total	113	82	111	70	95
Interest Income Recognized, Total

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