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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]                      
Net interest income $ 65,441 $ 63,161 $ 65,956 $ 62,516 $ 63,258 $ 65,917 $ 62,758 $ 61,009 $ 257,074 $ 252,942 $ 236,514
(Recapture of) Provision for Loan Losses 4,400 $ 2,000 $ 0 $ 0 1,100 $ 2,500 $ 2,000 $ 0 (6,400) (5,600) (16,100)
Net interest income after (recapture of) provision for loan losses                 263,474 258,542 252,614
Noninterest income                 35,552 33,483 36,412
Noninterest expense                 136,724 126,789 126,229
Debt termination expense                 16 13,870 0
Earnings before income taxes                 162,286 151,366 162,797
Goodwill 89,533       74,244       89,533 74,244 74,244
Segment assets 8,073,707       7,671,200       8,073,707 7,671,200 7,377,920
Operating Segments [Member] | Centers [Member]                      
Segment Reporting Information [Line Items]                      
Net interest income                 178,183 167,633 159,932
(Recapture of) Provision for Loan Losses                 (172) (6,711) (9,204)
Net interest income after (recapture of) provision for loan losses                 178,355 174,344 169,136
Noninterest income                 20,179 20,677 20,513
Noninterest expense                 50,110 48,568 47,493
Debt termination expense                 0 0 0
Earnings before income taxes                 148,424 146,453 142,156
Goodwill 89,533       74,244       89,533 74,244 74,244
Segment assets 7,024,986       6,441,751       7,024,986 6,441,751 5,988,858
Operating Segments [Member] | Dairy & Livestock and Agribusiness [Member]                      
Segment Reporting Information [Line Items]                      
Net interest income                 7,973 7,558 6,500
(Recapture of) Provision for Loan Losses                 2,296 143 (5,680)
Net interest income after (recapture of) provision for loan losses                 5,677 7,415 12,180
Noninterest income                 223 261 281
Noninterest expense                 1,958 1,844 1,757
Debt termination expense                 0 0 0
Earnings before income taxes                 3,942 5,832 10,704
Goodwill 0       0       0 0 0
Segment assets 473,670       458,214       473,670 458,214 430,181
Operating Segments [Member] | Other [Member]                      
Segment Reporting Information [Line Items]                      
Net interest income                 70,918 77,751 70,082
(Recapture of) Provision for Loan Losses                 (8,524) 968 (1,216)
Net interest income after (recapture of) provision for loan losses                 79,442 76,783 71,298
Noninterest income                 15,150 12,545 15,618
Noninterest expense                 84,656 76,377 76,979
Debt termination expense                 16 13,870 0
Earnings before income taxes                 9,920 (919) 9,937
Goodwill 0       0       0 0 0
Segment assets $ 575,052       $ 771,235       $ 575,052 $ 771,235 $ 958,880