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Business Segments - Schedule of Segment Reporting Information by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Net interest income $ 65,433 $ 62,516  
(Recapture of) provision for loan losses (4,500) 0  
Net interest income after (recapture of) provision for loan losses 69,933 62,516  
Noninterest income 8,722 8,683  
Noninterest expense 34,117 34,364  
Earnings before income taxes 44,538 36,835  
Goodwill 119,193 88,174 $ 89,533
Segment assets 8,559,121 7,920,836 $ 8,073,707
Operating Segments [Member] | Centers [Member]      
Segment Reporting Information [Line Items]      
Net interest income 45,578 42,234  
(Recapture of) provision for loan losses 511 2,200  
Net interest income after (recapture of) provision for loan losses 45,067 40,034  
Noninterest income 5,207 4,827  
Noninterest expense 12,438 12,610  
Earnings before income taxes 37,836 32,251  
Goodwill 119,193 88,174  
Segment assets 7,399,909 6,586,237  
Operating Segments [Member] | Dairy & Livestock and Agribusiness [Member]      
Segment Reporting Information [Line Items]      
Net interest income 2,144 1,933  
(Recapture of) provision for loan losses (2,699) (952)  
Net interest income after (recapture of) provision for loan losses 4,843 2,885  
Noninterest income 55 53  
Noninterest expense 501 479  
Earnings before income taxes 4,397 2,459  
Goodwill 0 0  
Segment assets 363,029 386,804  
Operating Segments [Member] | Other [Member]      
Segment Reporting Information [Line Items]      
Net interest income 17,711 18,349  
(Recapture of) provision for loan losses (2,312) (1,248)  
Net interest income after (recapture of) provision for loan losses 20,023 19,597  
Noninterest income 3,460 3,803  
Noninterest expense 21,178 21,275  
Earnings before income taxes 2,305 2,125  
Goodwill 0 0  
Segment assets $ 796,183 $ 947,795