8. ALLOWANCE FOR LOAN AND LEASE LOSSES (Detail) - (Table 3) (USD $)	3 Months Ended			9 Months Ended		3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended
	Sep. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Commercial Portfolio Segment [Member]	Sep. 30, 2012 Commercial Portfolio Segment [Member]	Sep. 30, 2011 Commercial Portfolio Segment [Member]	Dec. 31, 2011 Commercial Portfolio Segment [Member]	Sep. 30, 2012 Commercial Real Estate Portfolio Segment [Member]	Sep. 30, 2012 Commercial Real Estate Portfolio Segment [Member]	Sep. 30, 2011 Commercial Real Estate Portfolio Segment [Member]	Dec. 31, 2011 Commercial Real Estate Portfolio Segment [Member]	Sep. 30, 2012 Multi-Family Real Estate Portfolio Segment [Member]	Sep. 30, 2012 Multi-Family Real Estate Portfolio Segment [Member]	Sep. 30, 2011 Multi-Family Real Estate Portfolio Segment [Member]	Dec. 31, 2011 Multi-Family Real Estate Portfolio Segment [Member]	Sep. 30, 2012 Construction Real Estate Portfolio Segment [Member]	Sep. 30, 2012 Construction Real Estate Portfolio Segment [Member]	Sep. 30, 2011 Construction Real Estate Portfolio Segment [Member]	Dec. 31, 2011 Construction Real Estate Portfolio Segment [Member]	Sep. 30, 2012 Residential Portfolio Segment [Member]	Sep. 30, 2012 Residential Portfolio Segment [Member]	Sep. 30, 2011 Residential Portfolio Segment [Member]	Dec. 31, 2011 Residential Portfolio Segment [Member]	Sep. 30, 2012 Finance Leases Portfolio Segment [Member]	Sep. 30, 2012 Finance Leases Portfolio Segment [Member]	Sep. 30, 2011 Finance Leases Portfolio Segment [Member]	Dec. 31, 2011 Finance Leases Portfolio Segment [Member]	Sep. 30, 2012 Agriculture Portfolio Segment [Member]	Sep. 30, 2012 Agriculture Portfolio Segment [Member]	Sep. 30, 2011 Agriculture Portfolio Segment [Member]	Dec. 31, 2011 Agriculture Portfolio Segment [Member]	Sep. 30, 2012 Consumer Portfolio Segment [Member]	Sep. 30, 2012 Consumer Portfolio Segment [Member]	Sep. 30, 2011 Consumer Portfolio Segment [Member]	Dec. 31, 2011 Consumer Portfolio Segment [Member]	Sep. 30, 2012 Unallocated Porfolio Segment [Member]	Sep. 30, 2012 Unallocated Porfolio Segment [Member]	Sep. 30, 2011 Unallocated Porfolio Segment [Member]	Dec. 31, 2011 Unallocated Porfolio Segment [Member]	Sep. 30, 2012 Total [ Member]	Sep. 30, 2012 Total [ Member]	Sep. 30, 2011 Total [ Member]	Dec. 31, 2011 Total [ Member]
Beginning Balance						$ 1,065,000	$ 1,536,000	$ 2,574,000		$ 3,079,000	$ 3,156,000	$ 2,715,000		$ 263,000	$ 198,000	$ 115,000		$ 371,000	$ 582,000	$ 1,090,000		$ 502,000	$ 609,000	$ 581,000		$ 1,000	$ 79,000	$ 7,000		$ 206,000	$ 167,000	$ 131,000		$ 376,000	$ 348,000	$ 221,000		$ 338,000	$ 366,000	$ 151,000		$ 6,201,000	$ 7,041,000	$ 7,585,000
Provision	(410,000)		(550,000)	(1,365,000)	(3,625,000)	(75,000)	(395,000)	(221,000)		25,000	728,000	1,991,000		52,000	122,000	167,000		379,000	228,000	186,000		30,000	36,000	222,000		2,000	(74,000)	87,000		16,000	257,000	86,000		(47,000)	463,000	320,000		28,000		787,000		410,000	1,365,000	3,625,000
Loans charged-off		(74,000)				(151,000)	(302,000)	(587,000)		(279,000)	(1,124,000)	(1,820,000)			(8,000)	(83,000)		(295,000)	(377,000)	(456,000)		(54,000)	(167,000)	(333,000)		(1,000)	(9,000)				(202,000)	(240,000)		(2,000)	(494,000)	(220,000)						(782,000)	(2,683,000)	(3,739,000)
Recoveries						15,000	15,000	152,000		71,000	136,000	5,000			3,000				22,000								6,000					241,000		19,000	29,000	19,000						105,000	211,000	417,000
Ending balance						854,000	854,000			2,896,000	2,896,000			315,000	315,000			455,000	455,000			478,000	478,000			2,000	2,000			222,000	222,000			346,000	346,000			366,000	366,000			5,934,000	5,934,000
Ending balance:
Allowance individually evaluated for impairment						306,000	306,000		538,000	661,000	661,000		707,000	128,000	128,000		5,000				147,000	145,000	145,000		118,000					163,000	163,000		89,000	56,000	56,000		76,000					1,459,000	1,459,000		1,680,000
Ending balance:
Allowance collectively evaluated for impairment						548,000	548,000		998,000	2,235,000	2,235,000		2,449,000	187,000	187,000		193,000	455,000	455,000		435,000	333,000	333,000		491,000	2,000	2,000		79,000	59,000	59,000		78,000	290,000	290,000		272,000	366,000	366,000		366,000	4,475,000	4,475,000		5,361,000
Ending balance						32,385,000	32,385,000	1,918,000	42,108,000	192,817,000	192,817,000	2,891,000	204,043,000	9,237,000	9,237,000	199,000	7,580,000	8,722,000	8,722,000	820,000	10,356,000	18,665,000	18,665,000	470,000	19,695,000	1,886,000	1,886,000	94,000	1,725,000	3,675,000	3,675,000	218,000	4,583,000	8,956,000	8,956,000	340,000	10,984,000			938,000		276,343,000	276,343,000	7,888,000	301,074,000
Ending balance:
Allowance individually evaluated for impairment						4,574,000	4,574,000		5,123,000	16,812,000	16,812,000		18,227,000	1,688,000	1,688,000		1,204,000				2,083,000	1,932,000	1,932,000		2,116,000				17,000	389,000	389,000		597,000	622,000	622,000		718,000					26,017,000	26,017,000		30,085,000
Ending balance:
Allowance collectively evaluated for impairment						$ 27,811,000	$ 27,811,000		$ 36,985,000	$ 176,005,000	$ 176,005,000		$ 185,816,000	$ 7,549,000	$ 7,549,000		$ 6,376,000	$ 8,722,000	$ 8,722,000		$ 8,273,000	$ 16,733,000	$ 16,733,000		$ 17,579,000	$ 1,886,000	$ 1,886,000		$ 1,708,000	$ 3,286,000	$ 3,286,000		$ 3,986,000	$ 8,334,000	$ 8,334,000		$ 10,266,000					$ 250,326,000	$ 250,326,000		$ 270,989,000