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Allowance for Credit Losses and Recorded Investment in Financing Receivables (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Real Estate Loans	Jun. 30, 2012 Real Estate Loans	Dec. 31, 2011 Real Estate Loans	Jun. 30, 2012 Agricultural	Dec. 31, 2011 Agricultural	Mar. 31, 2012 Agricultural	Jun. 30, 2012 Commercial and Industrial	Jun. 30, 2012 Commercial and Industrial	Dec. 31, 2011 Commercial and Industrial	Jun. 30, 2012 Small Business Administration Loans	Jun. 30, 2012 Small Business Administration Loans	Dec. 31, 2011 Small Business Administration Loans	Jun. 30, 2012 Direct finance leases	Jun. 30, 2012 Direct finance leases	Dec. 31, 2011 Direct finance leases	Jun. 30, 2012 Consumer loans	Jun. 30, 2012 Consumer loans	Dec. 31, 2011 Consumer loans
Allowance for credit losses:
Beginning Balance	$ 17,408	$ 17,283	$ 21,138	$ 9,900	$ 8,260	$ 10,143	$ 19	$ 62	$ 18	$ 3,703	$ 4,638	$ 6,379	$ 1,397	$ 1,447	$ 1,274	$ 174	$ 311	$ 284	$ 2,216	$ 2,608	$ 2,996
Charge-offs	(6,949)	(9,903)	(16,987)	(4,446)	(5,400)	(10,596)				(1,449)	(2,540)	(3,407)	(332)	(418)	(148)		(198)	(82)	(722)	(1,347)	(2,754)
Recoveries	244	573	1,132	57	188	418				67	192	323	47	47	71			57	73	146	263
Provision	3,160	5,910	12,000	2,415	4,878	8,295	(1)	(43)		598	629	1,343	53	89	250	38	99	52	56	216	2,103
Ending Balance	13,863	13,863	17,283	7,926	7,926	8,260	18	19	18	2,919	2,919	4,638	1,165	1,165	1,447	212	212	311	1,623	1,623	2,608
Specific	7,671	7,671	8,754	5,573	5,573	5,229				498	498	1,481	1,055	1,055	1,212	159	159	291	386	386	541
General	6,192	6,192	8,529	2,353	2,353	3,031	18	19		2,421	2,421	3,157	110	110	235	53	53	20	1,237	1,237	2,067
Financing Receivable, Allowance for Credit Losses, Total	13,863	13,863	17,283	7,926	7,926	8,260	18	19	18	2,919	2,919	4,638	1,165	1,165	1,447	212	212	311	1,623	1,623	2,608
Individually	83,203	83,203	98,329	70,523	70,523	84,508	1,676			2,805	2,805	5,021	3,699	3,699	3,903	322	322	591	4,178	4,178	4,306
Collectively	734,397	734,397	659,262	483,969	483,969	492,724	17,556	17,078		183,361	183,361	94,387	16,968	16,968	17,103	4,922	4,922	6,152	27,621	27,621	31,818
Gross loans and leases	$ 817,600	$ 817,600	$ 757,591	$ 554,492	$ 554,492	$ 577,232	$ 19,232	$ 17,078		$ 186,166	$ 186,166	$ 99,408	$ 20,667	$ 20,667	$ 21,006	$ 5,244	$ 5,244	$ 6,743	$ 31,799	$ 31,799	$ 36,124

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Financing Receivable, Allowance for Credit Losses, Specific Reserves

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Loans and Leases Receivable Allowance, General Reserves

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Provisions for, (Reversals of) Credit Losses

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A valuation allowance for financing receivables that are expected to be uncollectible.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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-Section 50

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of direct write-downs of financing receivables charged against the allowance.

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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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