Loans and Leases - Summary of Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Impaired loans, Unpaid Contractual Principal Balance	$ 1,136	$ 1,197
Impaired loans, Recorded Investment With No Allowance	569	613
Impaired loans, Recorded Investment With Allowance	567	584
Impaired loans, Total Recorded Investment	1,136	1,197
Impaired loans, Related Allowance	197	168
Commercial and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans, Unpaid Contractual Principal Balance	25	36
Impaired loans, Recorded Investment With No Allowance	2	4
Impaired loans, Recorded Investment With Allowance	23	32
Impaired loans, Total Recorded Investment	25	36
Impaired loans, Related Allowance	23	32
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans, Unpaid Contractual Principal Balance	892	930
Impaired loans, Recorded Investment With No Allowance	348	378
Impaired loans, Recorded Investment With Allowance	544	552
Impaired loans, Total Recorded Investment	892	930
Impaired loans, Related Allowance	174	136
Consumer Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired loans, Unpaid Contractual Principal Balance	219	231
Impaired loans, Recorded Investment With No Allowance	219	231
Impaired loans, Recorded Investment With Allowance
Impaired loans, Total Recorded Investment	219	231
Impaired loans, Related Allowance