Non-performing Assets and Impaired Loans - Commercial Loans Individually Evaluated for Impairment by Class of Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance total	$ 7,005	$ 11,053	$ 7,426
Total ending loans balance	7,019	11,055	7,448
Allowance For Loan Loss Allocated	202	1,589	1,312
Average Balance in Impaired Loans total	7,110	5,277	7,336
Cash/Accrual Interest Income Recognized, Total	58	379	271
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	6,428	3,216	5,227
Recorded Investment With no recorded allowance	6,442	3,218	5,249
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0
Average Balance in Impaired Loans With no recorded allowance	6,699	2,343	5,545
Cash/Accrual Interest Income Recognized, With no recorded allowance	37	143	240
Unpaid Principal Balance With an allowance recorded	577	7,837	2,199
Recorded Investment With an allowance recorded	577	7,837	2,199
Allowance For Loan Loss Allocated	202	1,589	1,312
Average Balance in Impaired Loans With an allowance recorded	411	2,934	1,791
Cash/Accrual Interest Income Recognized, With an allowance recorded	21	236	31
Commercial [Member] \| Owner Occupied Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	1,340	1,169	1,293
Recorded Investment With no recorded allowance	1,339	1,170	1,296
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0
Average Balance in Impaired Loans With no recorded allowance	1,001	645	1,845
Cash/Accrual Interest Income Recognized, With no recorded allowance	22	65	68
Unpaid Principal Balance With an allowance recorded	410	422
Recorded Investment With an allowance recorded	410	422
Allowance For Loan Loss Allocated	105	165
Average Balance in Impaired Loans With an allowance recorded	243	141
Cash/Accrual Interest Income Recognized, With an allowance recorded	8	16
Commercial [Member] \| Non Owner Occupied Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	4,938	1,193	3,521
Recorded Investment With no recorded allowance	4,953	1,194	3,525
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0
Average Balance in Impaired Loans With no recorded allowance	5,417	1,341	2,963
Cash/Accrual Interest Income Recognized, With no recorded allowance	8	51	172
Unpaid Principal Balance With an allowance recorded	70	6,453	403
Recorded Investment With an allowance recorded	70	6,453	403
Allowance For Loan Loss Allocated	32	744	202
Average Balance in Impaired Loans With an allowance recorded	6	1,995	485
Cash/Accrual Interest Income Recognized, With an allowance recorded	13	208
Commercial [Member] \| Residential Development [Member]
Financing Receivable, Impaired [Line Items]
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0
Commercial [Member] \| Development & Spec Land Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	71		23
Recorded Investment With no recorded allowance	71		23
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0
Average Balance in Impaired Loans With no recorded allowance	6		25
Cash/Accrual Interest Income Recognized, With no recorded allowance	3
Unpaid Principal Balance With an allowance recorded			159
Recorded Investment With an allowance recorded			159
Allowance For Loan Loss Allocated			48
Average Balance in Impaired Loans With an allowance recorded			166
Commercial [Member] \| Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	79	854	390
Recorded Investment With no recorded allowance	79	854	405
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0
Average Balance in Impaired Loans With no recorded allowance	275	357	712
Cash/Accrual Interest Income Recognized, With no recorded allowance	4	27
Unpaid Principal Balance With an allowance recorded	97	962	1,637
Recorded Investment With an allowance recorded	97	962	1,637
Allowance For Loan Loss Allocated	65	680	1,062
Average Balance in Impaired Loans With an allowance recorded	$ 162	798	1,140
Cash/Accrual Interest Income Recognized, With an allowance recorded		$ 12	$ 31

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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 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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