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Business Segments - Schedule of Segment Reporting Information by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Net interest income $ 70,521 $ 65,433  
(Recapture of) provision for loan losses (1,000) (4,500)  
Net interest income after (recapture of) provision for loan losses 71,521 69,933  
Noninterest income 12,916 8,722  
Noninterest expense 35,946 34,117  
Earnings before income taxes 48,491 44,538  
Goodwill 116,564 119,193 $ 116,564
Segment assets 8,356,160 8,559,121 $ 8,270,586
Operating Segments [Member] | Centers [Member]      
Segment Reporting Information [Line Items]      
Net interest income 49,583 45,578  
(Recapture of) provision for loan losses 329 511  
Net interest income after (recapture of) provision for loan losses 49,254 45,067  
Noninterest income 5,301 5,207  
Noninterest expense 13,225 12,438  
Earnings before income taxes 41,330 37,836  
Goodwill 116,564 119,193  
Segment assets 7,231,624 7,399,909  
Operating Segments [Member] | Dairy & Livestock and Agribusiness [Member]      
Segment Reporting Information [Line Items]      
Net interest income 3,851 2,144  
(Recapture of) provision for loan losses 19 (2,699)  
Net interest income after (recapture of) provision for loan losses 3,832 4,843  
Noninterest income 45 55  
Noninterest expense 517 501  
Earnings before income taxes 3,360 4,397  
Goodwill 0 0  
Segment assets 407,527 363,029  
Operating Segments [Member] | Other [Member]      
Segment Reporting Information [Line Items]      
Net interest income 17,087 17,711  
(Recapture of) provision for loan losses (1,348) (2,312)  
Net interest income after (recapture of) provision for loan losses 18,435 20,023  
Noninterest income 7,570 3,460  
Noninterest expense 22,204 21,178  
Earnings before income taxes 3,801 2,305  
Goodwill 0 0  
Segment assets $ 717,009 $ 796,183