Non-performing Loans and Impaired Loans - Commercial Loans Individually Evaluated for Impairment by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance total	$ 8,491	$ 7,887	$ 8,491	$ 7,887
Total ending loans balance	8,497	7,919	8,497	7,919
Allowance For Loan Loss Allocated	1,175	1,316	1,175	1,316
Average Balance in Impaired Loans total	8,051	10,136	7,416	9,794
Cash/Accrual Interest Income Recognized, Total	128	24	278	87
Commercial [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance With no recorded allowance	6,364	5,063	6,364	5,063
Recorded Investment With no recorded allowance	6,370	5,083	6,370	5,083
Allowance For Loan Loss Allocated With no recorded allowance
Average Balance in Impaired Loans With no recorded allowance	5,750	7,094	5,232	7,319
Cash/Accrual Interest Income Recognized, With no recorded allowance	128	24	270	64
Unpaid Principal Balance With an allowance recorded	2,127	2,824	2,127	2,824
Recorded Investment With an allowance recorded	2,127	2,836	2,127	2,836
Allowance For Loan Loss Allocated	1,175	1,316	1,175	1,316
Average Balance in Impaired Loans With an allowance recorded	2,301	3,042	2,184	2,475
Cash/Accrual Interest Income Recognized, With an allowance recorded			8	23
Commercial [Member] \| Owner Occupied Real Estate [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance With no recorded allowance	2,851	1,329	2,851	1,329
Recorded Investment With no recorded allowance	2,854	1,331	2,854	1,331
Allowance For Loan Loss Allocated With no recorded allowance
Average Balance in Impaired Loans With no recorded allowance	2,126	1,959	1,525	2,685
Cash/Accrual Interest Income Recognized, With no recorded allowance	85	16	129	43
Unpaid Principal Balance With an allowance recorded	403		403
Recorded Investment With an allowance recorded	403		403
Allowance For Loan Loss Allocated	13		13
Average Balance in Impaired Loans With an allowance recorded	406	(1)	274
Cash/Accrual Interest Income Recognized, With an allowance recorded			6
Commercial [Member] \| Non Owner Occupied Real Estate [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance With no recorded allowance	3,232	3,167	3,232	3,167
Recorded Investment With no recorded allowance	3,235	3,170	3,235	3,170
Allowance For Loan Loss Allocated With no recorded allowance
Average Balance in Impaired Loans With no recorded allowance	3,257	3,814	3,274	3,298
Cash/Accrual Interest Income Recognized, With no recorded allowance	43	8	141	23
Unpaid Principal Balance With an allowance recorded	333	487	333	487
Recorded Investment With an allowance recorded	333	487	333	487
Allowance For Loan Loss Allocated	150	302	150	302
Average Balance in Impaired Loans With an allowance recorded	335	491	343	502
Cash/Accrual Interest Income Recognized, With an allowance recorded
Commercial [Member] \| Residential Development [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance With no recorded allowance
Recorded Investment With no recorded allowance
Allowance For Loan Loss Allocated With no recorded allowance
Average Balance in Impaired Loans With no recorded allowance
Cash/Accrual Interest Income Recognized, With no recorded allowance
Unpaid Principal Balance With an allowance recorded
Recorded Investment With an allowance recorded
Allowance For Loan Loss Allocated
Average Balance in Impaired Loans With an allowance recorded
Cash/Accrual Interest Income Recognized, With an allowance recorded
Commercial [Member] \| Development & Spec Land Loans [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance With no recorded allowance		21		21
Recorded Investment With no recorded allowance		21		21
Allowance For Loan Loss Allocated With no recorded allowance
Average Balance in Impaired Loans With no recorded allowance		24		25
Cash/Accrual Interest Income Recognized, With no recorded allowance
Unpaid Principal Balance With an allowance recorded		149		149
Recorded Investment With an allowance recorded		149		149
Allowance For Loan Loss Allocated		48		48
Average Balance in Impaired Loans With an allowance recorded		173		165
Cash/Accrual Interest Income Recognized, With an allowance recorded
Commercial [Member] \| Commercial and Industrial [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance With no recorded allowance	281	546	281	546
Recorded Investment With no recorded allowance	281	561	281	561
Allowance For Loan Loss Allocated With no recorded allowance
Average Balance in Impaired Loans With no recorded allowance	367	1,297	433	1,311
Cash/Accrual Interest Income Recognized, With no recorded allowance	0		0
Unpaid Principal Balance With an allowance recorded	1,391	2,188	1,391	2,188
Recorded Investment With an allowance recorded	1,391	2,200	1,391	2,200
Allowance For Loan Loss Allocated	1,012	966	1,012	966
Average Balance in Impaired Loans With an allowance recorded	1,560	2,379	1,567	1,808
Cash/Accrual Interest Income Recognized, With an allowance recorded			$ 2	$ 23

Impaired financing receivable interest income accrual method and cash basis method.

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Impaired Financing Receivable With No Related Allowance

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Impaired financing receivable with related allowance interest income accrual method and cash basis method.

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524

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Amount of allowance for credit losses related to recorded investment.

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