Other Operating Expenses - Summary of Other Operating Expenses (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Income And Expenses [Abstract]
Marketing	$ 1,749	$ 1,853	$ 1,575
Software maintenance/amortization	1,417	1,256	951
Legal and audit	1,281	1,179	1,140
Contributions	673	1,074	479
Processing services	812	921	865
Consulting	874	890	796
Postage and delivery	939	877	773
Supplies	848	849	868
Telephone	719	750	742
Directors' fees	373	330	309
Insurance	295	279	275
Core deposit intangible amortization		120	388
Other	1,500	1,230	1,280
Total	$ 11,480	$ 11,608	$ 10,441