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
Mar. 31, 2015	Mar. 31, 2014
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance total	$ 8,541	$ 7,313
Total ending loans balance	8,547	7,335
Allowance For Loan Loss Allocated	1,029	1,290
Average Balance in Impaired Loans total	9,470	8,126
Cash/Accrual Interest Income Recognized, Total	8	19
Commercial [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance With no recorded allowance	5,592	4,945
Recorded Investment With no recorded allowance	5,598	4,967
Allowance For Loan Loss Allocated With no recorded allowance	0	0
Average Balance in Impaired Loans With no recorded allowance	6,512	5,905
Cash/Accrual Interest Income Recognized, With no recorded allowance	8	17
Unpaid Principal Balance With an allowance recorded	2,949	2,368
Recorded Investment With an allowance recorded	2,949	2,368
Allowance For Loan Loss Allocated	1,029	1,290
Average Balance in Impaired Loans With an allowance recorded	2,958	2,221
Cash/Accrual Interest Income Recognized, With an allowance recorded		2
Commercial [Member] \| Owner Occupied Real Estate [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance With no recorded allowance	1,076	1,145
Recorded Investment With no recorded allowance	1,077	1,148
Allowance For Loan Loss Allocated With no recorded allowance	0	0
Average Balance in Impaired Loans With no recorded allowance	1,329	1,759
Cash/Accrual Interest Income Recognized, With no recorded allowance	2	12
Unpaid Principal Balance With an allowance recorded	417
Recorded Investment With an allowance recorded	417
Allowance For Loan Loss Allocated	165
Average Balance in Impaired Loans With an allowance recorded	419	(1)
Commercial [Member] \| Non Owner Occupied Real Estate [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance With no recorded allowance	3,907	3,443
Recorded Investment With no recorded allowance	3,912	3,446
Allowance For Loan Loss Allocated With no recorded allowance	0	0
Average Balance in Impaired Loans With no recorded allowance	4,534	3,514
Cash/Accrual Interest Income Recognized, With no recorded allowance	6	5
Unpaid Principal Balance With an allowance recorded	1,590	347
Recorded Investment With an allowance recorded	1,590	347
Allowance For Loan Loss Allocated	184	170
Average Balance in Impaired Loans With an allowance recorded	1,590	353
Commercial [Member] \| Residential Development [Member]
Schedule Of Financial Receivables [Line Items]
Allowance For Loan Loss Allocated With no recorded allowance	0	0
Commercial [Member] \| Development & Spec Land Loans [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance With no recorded allowance		24
Recorded Investment With no recorded allowance		24
Allowance For Loan Loss Allocated With no recorded allowance	0	0
Average Balance in Impaired Loans With no recorded allowance		24
Unpaid Principal Balance With an allowance recorded		138
Recorded Investment With an allowance recorded		138
Allowance For Loan Loss Allocated		40
Average Balance in Impaired Loans With an allowance recorded		142
Commercial [Member] \| Commercial and Industrial [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance With no recorded allowance	609	333
Recorded Investment With no recorded allowance	609	349
Allowance For Loan Loss Allocated With no recorded allowance	0	0
Average Balance in Impaired Loans With no recorded allowance	649	608
Unpaid Principal Balance With an allowance recorded	942	1,883
Recorded Investment With an allowance recorded	942	1,883
Allowance For Loan Loss Allocated	680	1,080
Average Balance in Impaired Loans With an allowance recorded	949	1,727
Cash/Accrual Interest Income Recognized, With an allowance recorded		$ 2

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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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)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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-Paragraph 14A

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