Non-performing Loans and Impaired Loans - Commercial Loans Individually Evaluated for Impairment by Class of Loan (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance total	$ 5,840	$ 10,832	$ 5,840	$ 10,832
Total ending loans balance	5,855	10,848	5,855	10,848
Allowance For Loan Loss Allocated		1,599		1,599
Average Balance in Impaired Loans total	6,163	11,262	5,716	10,271
Cash/Accrual Interest Income Recognized, Total	1	6	3	73
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	5,840	4,272	5,840	4,272
Recorded Investment With no recorded allowance	5,855	4,278	5,855	4,278
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Average Balance in Impaired Loans With no recorded allowance	6,163	4,660	5,716	4,302
Cash/Accrual Interest Income Recognized, With no recorded allowance	1	6	3	18
Unpaid Principal Balance With an allowance recorded		6,560		6,560
Recorded Investment With an allowance recorded		6,570		6,570
Allowance For Loan Loss Allocated		1,599		1,599
Average Balance in Impaired Loans With an allowance recorded		6,602		5,969
Cash/Accrual Interest Income Recognized, With an allowance recorded				55
Commercial [Member] \| Owner Occupied Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	994	1,235	994	1,235
Recorded Investment With no recorded allowance	995	1,238	995	1,238
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Average Balance in Impaired Loans With no recorded allowance	1,029	1,262	1,062	1,041
Cash/Accrual Interest Income Recognized, With no recorded allowance		1		10
Unpaid Principal Balance With an allowance recorded		2,967		2,967
Recorded Investment With an allowance recorded		2,966		2,966
Allowance For Loan Loss Allocated		598		598
Average Balance in Impaired Loans With an allowance recorded		2,968		2,191
Cash/Accrual Interest Income Recognized, With an allowance recorded				55
Commercial [Member] \| Non Owner Occupied Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance With no recorded allowance	3,106	2,798	3,106	2,798
Recorded Investment With no recorded allowance	3,120	2,801	3,120	2,801
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Average Balance in Impaired Loans With no recorded allowance	3,150	2,815	3,776	2,846
Cash/Accrual Interest Income Recognized, With no recorded allowance	1	1	3	4
Unpaid Principal Balance With an allowance recorded		2,817		2,817
Recorded Investment With an allowance recorded		2,828		2,828
Allowance For Loan Loss Allocated		550		550
Average Balance in Impaired Loans With an allowance recorded		2,858		2,942
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	1,740	239	1,740	239
Recorded Investment With no recorded allowance	1,740	239	1,740	239
Allowance For Loan Loss Allocated With no recorded allowance	0	0	0	0
Average Balance in Impaired Loans With no recorded allowance	$ 1,984	583	$ 878	415
Cash/Accrual Interest Income Recognized, With no recorded allowance		4		4
Unpaid Principal Balance With an allowance recorded		776		776
Recorded Investment With an allowance recorded		776		776
Allowance For Loan Loss Allocated		451		451
Average Balance in Impaired Loans With an allowance recorded		$ 776		$ 836

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