Deposits - Maturity Distribution for Certificates of Deposit (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Time Deposits By Maturity [Abstract]
In one year or less	$ 213,454,000	$ 246,630,000
In one to two years	80,138,000	61,004,000
In two to three years	73,271,000	67,635,000
In three to four years	95,979,000	63,894,000
In four to five years	48,126,000	94,843,000
Total certificates of deposit	$ 510,968,000	$ 534,006,000