Loans - Schedule of Impairment by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 12,708	$ 11,136
Recorded Investment with no Allowance	722	907
Recorded Investment with Allowance	11,669	9,748
Total Recorded Investment	12,391	10,655
Related Allowance	1,011	784
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	7,202	5,595
Recorded Investment with no Allowance	52	7
Recorded Investment with Allowance	7,092	5,580
Total Recorded Investment	7,144	5,587
Related Allowance	383	241
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	3,548	3,540
Recorded Investment with no Allowance	106	563
Recorded Investment with Allowance	3,321	2,658
Total Recorded Investment	3,427	3,221
Related Allowance	421	331
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,958	2,001
Recorded Investment with no Allowance	564	337
Recorded Investment with Allowance	1,256	1,510
Total Recorded Investment	1,820	1,847
Related Allowance	$ 207	$ 212