9. Interest-Bearing Deposits (Detail) - Table of Interest Expense Recognized on Interest-Bearing Deposits (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest Expense on Deposit Liabilities	$ 1,610	$ 2,238	$ 2,952
Savings Deposits [Member]
Interest Expense on Deposit Liabilities	114	183	224
Money Market Deposits [Member]
Interest Expense on Deposit Liabilities	616	1,000	1,268
NOW Accounts Deposits [Member]
Interest Expense on Deposit Liabilities	42	44	59
Time Deposits [Member]
Interest Expense on Deposit Liabilities	528	601	806
Other Time Deposits [Member]
Interest Expense on Deposit Liabilities	$ 310	$ 410	$ 595