15. Other Non-Interest Income and Expense (Detail) - Table of Other Non-Interest Expense (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Professional fees	$ 1,031,000	$ 1,037,000	$ 1,191,000
Outsourced item processing	379,000	427,000	414,000
Directors' expense	384,000	327,000	371,000
Telephone and postage	335,000	330,000	336,000
Amortization of intangible assets	183,000	219,000	242,000
Stationery and supplies	229,000	183,000	208,000
Advertising and promotion	268,000	231,000	198,000
Other operating expenses	959,000	1,004,000	1,010,000
	$ 3,768,000	$ 3,758,000	$ 3,970,000