Recent Events (Detail) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Aug. 03, 2012 Waukegan Savings Bank [Member]
Business Acquisition [Line Items]
Gain on FDIC-assisted transaction	$ 0	$ 3,289,000	$ 0	$ 3,300,000
Financial assets, acquired loans				46,300,000
Financial liabilities, deposits				72,700,000
Transactional deposits				41,500,000
Time deposits				31,200,000
Intangible assets (other than goodwill)				$ 781,000