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Business Segments - Schedule of Segment Reporting Information by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Net interest income $ 71,275 $ 71,739 $ 70,483 $ 65,433 $ 65,441 $ 63,161 $ 65,956 $ 62,516 $ 278,930 $ 257,074 $ 252,942
(Recapture of) provision for loan losses                 (8,500) (6,400) (5,600)
Net interest income after (recapture of) provision for loan losses                 287,430 263,474 258,542
Noninterest income                 42,118 35,552 33,483
Noninterest expense                 140,753 136,724 126,789
Debt termination expense                 0 16 13,870
Earnings before income taxes                 188,795 162,286 151,366
Goodwill 116,564       89,533       116,564 89,533 74,244
Segment assets 8,270,586       8,073,707       8,270,586 8,073,707 7,671,200
Operating Segments [Member] | Centers [Member]                      
Segment Reporting Information [Line Items]                      
Net interest income                 195,377 178,183 167,633
(Recapture of) provision for loan losses                 1,712 (172) (6,711)
Net interest income after (recapture of) provision for loan losses                 193,665 178,355 174,344
Noninterest income                 21,674 20,179 20,677
Noninterest expense                 51,337 50,110 48,568
Debt termination expense                   0 0
Earnings before income taxes                 164,002 148,424 146,453
Goodwill 116,564       89,533       116,564 89,533 74,244
Segment assets 7,235,549       7,024,986       7,235,549 7,024,986 6,441,751
Operating Segments [Member] | Dairy & Livestock and Agribusiness [Member]                      
Segment Reporting Information [Line Items]                      
Net interest income                 10,798 7,973 7,558
(Recapture of) provision for loan losses                 (3,913) 2,296 143
Net interest income after (recapture of) provision for loan losses                 14,711 5,677 7,415
Noninterest income                 232 223 261
Noninterest expense                 1,963 1,958 1,844
Debt termination expense                   0 0
Earnings before income taxes                 12,980 3,942 5,832
Goodwill 0       0       0 0 0
Segment assets 474,292       473,670       474,292 473,670 458,214
Operating Segments [Member] | Other [Member]                      
Segment Reporting Information [Line Items]                      
Net interest income                 72,755 70,918 77,751
(Recapture of) provision for loan losses                 (6,299) (8,524) 968
Net interest income after (recapture of) provision for loan losses                 79,054 79,442 76,783
Noninterest income                 20,212 15,150 12,545
Noninterest expense                 87,453 84,656 76,377
Debt termination expense                   16 13,870
Earnings before income taxes                 11,813 9,920 (919)
Goodwill 0       0       0 0 0
Segment assets $ 560,745       $ 575,051       $ 560,745 $ 575,051 $ 771,235