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Loans and Allowance for Loan Losses - Loans Held-for-Investment by Class of Financing Receivables (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Receivables [Abstract]      
Commercial $ 617,925 $ 596,730 $ 608,226
Agricultural 75,133 75,928 60,663
Real estate 1,733,604 1,678,514 1,574,524
Consumer 346,412 333,113 317,477
Total $ 2,773,074 $ 2,684,285 $ 2,560,890