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Business Segments - Schedule of Segment Reporting Information by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]          
Net interest income $ 70,483 $ 65,956 $ 135,916 $ 128,472  
(Recapture of) provision for loan losses (1,000) 0 (5,500) 0  
Net interest income after (recapture of) provision for loan losses 71,483 65,956 141,416 128,472  
Noninterest income 10,776 9,274 19,498 17,957  
Noninterest expense 36,873 34,438 70,990 68,802  
Earnings before income taxes 45,386 40,792 89,924 77,627  
Goodwill 119,193 88,174 119,193 88,174 $ 89,533
Segment assets 8,418,203 8,312,307 8,418,203 8,312,307 $ 8,073,707
Operating Segments [Member] | Centers [Member]          
Segment Reporting Information [Line Items]          
Net interest income 48,762 44,583 94,340 86,817  
(Recapture of) provision for loan losses 875 1,215 1,386 3,415  
Net interest income after (recapture of) provision for loan losses 47,887 43,368 92,954 83,402  
Noninterest income 5,303 5,326 10,510 10,153  
Noninterest expense 13,206 12,891 25,644 25,501  
Earnings before income taxes 39,984 35,803 77,820 68,054  
Goodwill 119,193 88,174 119,193 88,174  
Segment assets 7,314,110 6,949,273 7,314,110 6,949,273  
Operating Segments [Member] | Dairy & Livestock and Agribusiness [Member]          
Segment Reporting Information [Line Items]          
Net interest income 2,369 1,986 4,513 3,919  
(Recapture of) provision for loan losses (421) (401) (3,120) (1,353)  
Net interest income after (recapture of) provision for loan losses 2,790 2,387 7,633 5,272  
Noninterest income 49 54 104 107  
Noninterest expense 504 499 1,005 978  
Earnings before income taxes 2,335 1,942 6,732 4,401  
Goodwill 0 0 0 0  
Segment assets 348,570 378,246 348,570 378,246  
Operating Segments [Member] | Other [Member]          
Segment Reporting Information [Line Items]          
Net interest income 19,352 19,387 37,063 37,736  
(Recapture of) provision for loan losses (1,454) (814) (3,766) (2,062)  
Net interest income after (recapture of) provision for loan losses 20,806 20,201 40,829 39,798  
Noninterest income 5,424 3,894 8,884 7,697  
Noninterest expense 23,163 21,048 44,341 42,323  
Earnings before income taxes 3,067 3,047 5,372 5,172  
Goodwill 0 0 0 0  
Segment assets $ 755,523 $ 984,788 $ 755,523 $ 984,788