Non-performing Loans and Impaired Loans - Commercial Loans Individually Evaluated for Impairment by Class of Loans (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance total	$ 10,832	$ 8,491	$ 10,832	$ 8,491
Total ending loans balance	10,848	8,497	10,848	8,497
Allowance For Loan Loss Allocated	1,599	1,175	1,599	1,175
Average Balance in Impaired Loans total	11,262	8,051	10,271	7,416
Cash/Accrual Interest Income Recognized, Total	6	128	73	278
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	4,272	6,364	4,272	6,364
Recorded Investment With no recorded allowance	4,278	6,370	4,278	6,370
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Average Balance in Impaired Loans With no recorded allowance	4,660	5,750	4,302	5,232
Cash/Accrual Interest Income Recognized, With no recorded allowance	6	128	18	270
Unpaid Principal Balance With an allowance recorded	6,560	2,127	6,560	2,127
Recorded Investment With an allowance recorded	6,570	2,127	6,570	2,127
Allowance For Loan Loss Allocated	1,599	1,175	1,599	1,175
Average Balance in Impaired Loans With an allowance recorded	6,602	2,301	5,969	2,184
Cash/Accrual Interest Income Recognized, With an allowance recorded			55	8
Commercial [Member] \| Owner Occupied Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	1,235	2,851	1,235	2,851
Recorded Investment With no recorded allowance	1,238	2,854	1,238	2,854
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Average Balance in Impaired Loans With no recorded allowance	1,262	2,126	1,041	1,525
Cash/Accrual Interest Income Recognized, With no recorded allowance	1	85	10	129
Unpaid Principal Balance With an allowance recorded	2,967	403	2,967	403
Recorded Investment With an allowance recorded	2,966	403	2,966	403
Allowance For Loan Loss Allocated	598	13	598	13
Average Balance in Impaired Loans With an allowance recorded	2,968	406	2,191	274
Cash/Accrual Interest Income Recognized, With an allowance recorded			55	6
Commercial [Member] \| Non Owner Occupied Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	2,798	3,232	2,798	3,232
Recorded Investment With no recorded allowance	2,801	3,235	2,801	3,235
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Average Balance in Impaired Loans With no recorded allowance	2,815	3,257	2,846	3,274
Cash/Accrual Interest Income Recognized, With no recorded allowance	1	43	4	141
Unpaid Principal Balance With an allowance recorded	2,817	333	2,817	333
Recorded Investment With an allowance recorded	2,828	333	2,828	333
Allowance For Loan Loss Allocated	550	150	550	150
Average Balance in Impaired Loans With an allowance recorded	2,858	335	2,942	343
Commercial [Member] \| Residential Development [Member]
Financing Receivable, Impaired [Line Items]
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Commercial [Member] \| Development & Spec Land Loans [Member]
Financing Receivable, Impaired [Line Items]
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Commercial [Member] \| Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	239	281	239	281
Recorded Investment With no recorded allowance	239	281	239	281
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Average Balance in Impaired Loans With no recorded allowance	583	367	415	433
Cash/Accrual Interest Income Recognized, With no recorded allowance	4		4
Unpaid Principal Balance With an allowance recorded	776	1,391	776	1,391
Recorded Investment With an allowance recorded	776	1,391	776	1,391
Allowance For Loan Loss Allocated	451	1,012	451	1,012
Average Balance in Impaired Loans With an allowance recorded	$ 776	$ 1,560	$ 836	1,567
Cash/Accrual Interest Income Recognized, With an allowance recorded				$ 2

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