Non-performing Assets and Impaired Loans - Commercial Loans Individually Evaluated for Impairment by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance total	$ 11,053	$ 7,426	$ 10,597
Total ending loans balance	11,055	7,448	10,627
Allowance For Loan Loss Allocated	1,589	1,312	1,945
Average Balance in Impaired Loans total	5,277	7,336	6,137
Cash/Accrual Interest Income Recognized, Total	379	271	201
Commercial [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance With no recorded allowance	3,216	5,227	7,433
Recorded Investment With no recorded allowance	3,218	5,249	7,463
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0
Average Balance in Impaired Loans With no recorded allowance	2,343	5,545	4,324
Cash/Accrual Interest Income Recognized, With no recorded allowance	143	240	100
Unpaid Principal Balance With an allowance recorded	7,837	2,199	3,164
Recorded Investment With an allowance recorded	7,837	2,199	3,164
Allowance For Loan Loss Allocated	1,589	1,312	1,945
Average Balance in Impaired Loans With an allowance recorded	2,934	1,791	1,813
Cash/Accrual Interest Income Recognized, With an allowance recorded	236	31	101
Commercial [Member] \| Owner Occupied Real Estate [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance With no recorded allowance	1,169	1,293	4,890
Recorded Investment With no recorded allowance	1,170	1,296	4,901
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0
Average Balance in Impaired Loans With no recorded allowance	645	1,845	2,422
Cash/Accrual Interest Income Recognized, With no recorded allowance	65	68	80
Unpaid Principal Balance With an allowance recorded	422
Recorded Investment With an allowance recorded	422
Allowance For Loan Loss Allocated	165
Average Balance in Impaired Loans With an allowance recorded	141
Cash/Accrual Interest Income Recognized, With an allowance recorded	16
Commercial [Member] \| Non Owner Occupied Real Estate [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance With no recorded allowance	1,193	3,521	1,961
Recorded Investment With no recorded allowance	1,194	3,525	1,963
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0
Average Balance in Impaired Loans With no recorded allowance	1,341	2,963	1,544
Cash/Accrual Interest Income Recognized, With no recorded allowance	51	172	20
Unpaid Principal Balance With an allowance recorded	6,453	403	1,795
Recorded Investment With an allowance recorded	6,453	403	1,795
Allowance For Loan Loss Allocated	744	202	1,080
Average Balance in Impaired Loans With an allowance recorded	1,995	485	481
Cash/Accrual Interest Income Recognized, With an allowance recorded	208		95
Commercial [Member] \| Residential Development [Member]
Schedule Of Financial Receivables [Line Items]
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0
Commercial [Member] \| Development & Spec Land Loans [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance With no recorded allowance		23	133
Recorded Investment With no recorded allowance		23	133
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0
Average Balance in Impaired Loans With no recorded allowance		25	61
Unpaid Principal Balance With an allowance recorded		159	572
Recorded Investment With an allowance recorded		159	572
Allowance For Loan Loss Allocated		48	600
Average Balance in Impaired Loans With an allowance recorded		166	526
Cash/Accrual Interest Income Recognized, With an allowance recorded			6
Commercial [Member] \| Commercial and Industrial [Member]
Schedule Of Financial Receivables [Line Items]
Unpaid Principal Balance With no recorded allowance	854	390	449
Recorded Investment With no recorded allowance	854	405	466
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0
Average Balance in Impaired Loans With no recorded allowance	357	712	297
Cash/Accrual Interest Income Recognized, With no recorded allowance	27
Unpaid Principal Balance With an allowance recorded	962	1,637	797
Recorded Investment With an allowance recorded	962	1,637	797
Allowance For Loan Loss Allocated	680	1,062	265
Average Balance in Impaired Loans With an allowance recorded	798	1,140	806
Cash/Accrual Interest Income Recognized, With an allowance recorded	$ 12	$ 31

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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-Name Accounting Standards Codification

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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

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-Paragraph 14A

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