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Loans and Allowance for Loan Losses - Major Classifications of Loans Held for Investment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Receivables [Abstract]
Commercial	$ 513,422	$ 509,609	$ 433,351
Agricultural	55,247	68,306	57,977
Real estate	1,275,564	1,226,823	1,083,244
Consumer	283,782	272,428	218,600
Total	$ 2,128,015	$ 2,077,166	$ 1,793,172

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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