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Loans and Allowance for Loan Losses - Major Classifications of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Loans [Line Items]
Commercial	$ 509,609	$ 454,087
Agricultural	68,306	68,122
Real estate	1,226,823	1,041,396
Consumer	272,428	212,310
Total	$ 2,077,166	$ 1,775,915

Amount before allowance of loans issued to agricultural institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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- Definition

Amount before allowance of loans issued to commercial and industrial institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes real estate loans and loans covered under loss sharing agreements.

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