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Loans and Allowance for Loan Losses - Schedule of Internal Ratings of Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan $ 3,283,655 $ 3,317,050 $ 2,942,224
Commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan 661,659 696,163 649,909
Agriculture [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan 80,812 102,351 92,317
Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan 2,154,388 2,136,233 1,838,488
Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan 386,796 382,303 361,510
Pass [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan 3,150,990 3,167,624 2,846,455
Pass [Member] | Commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan 608,758 633,083 611,071
Pass [Member] | Agriculture [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan 77,870 99,862 91,657
Pass [Member] | Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan 2,080,544 2,054,738 1,783,633
Pass [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan 383,818 379,941 360,094
Special Mention [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan 26,125 40,576 47,409
Special Mention [Member] | Commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan 5,027 9,762 25,438
Special Mention [Member] | Agriculture [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan   1,398 159
Special Mention [Member] | Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan 20,852 29,000 21,504
Special Mention [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan 246 416 308
Substandard [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan 106,540 108,813 48,317
Substandard [Member] | Commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan 47,874 53,318 13,400
Substandard [Member] | Agriculture [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan 2,942 1,091 501
Substandard [Member] | Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan 52,992 52,458 33,308
Substandard [Member] | Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan $ 2,732 1,946 1,108
Doubtful [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan   37 43
Doubtful [Member] | Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Internal ratings of loan   $ 37 $ 43