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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]          
Net interest income $ 72,688 $ 70,483 $ 143,209 $ 135,916  
(Recapture of) provision for loan losses (1,000) (1,000) (2,000) (5,500)  
Net interest income after (recapture of) provision for loan losses 73,688 71,483 145,209 141,416  
Noninterest income 9,695 10,776 22,611 19,498  
Noninterest expense 34,254 36,873 70,200 70,990  
Debt termination expense   0 0 0  
Earnings before income taxes 49,129 45,386 97,620 89,924  
Goodwill 116,564 119,193 116,564 119,193 $ 116,564
Segment assets 8,093,863 8,418,203 8,093,863 8,418,203 $ 8,270,586
Operating Segments [Member] | Centers [Member]          
Segment Reporting Information [Line Items]          
Net interest income 52,271 48,762 101,854 94,340  
(Recapture of) provision for loan losses (70) 875 259 1,386  
Net interest income after (recapture of) provision for loan losses 52,341 47,887 101,595 92,954  
Noninterest income 5,637 5,303 10,938 10,510  
Noninterest expense 12,779 13,206 26,004 25,644  
Debt termination expense   0 0 0  
Earnings before income taxes 45,199 39,984 86,529 77,820  
Goodwill 116,564 119,193 116,564 119,193  
Segment assets 6,996,216 7,314,110 6,996,216 7,314,110  
Operating Segments [Member] | Dairy & Livestock and Agribusiness [Member]          
Segment Reporting Information [Line Items]          
Net interest income 3,467 2,369 7,318 4,513  
(Recapture of) provision for loan losses (334) (421) (315) (3,120)  
Net interest income after (recapture of) provision for loan losses 3,801 2,790 7,633 7,633  
Noninterest income 47 49 92 104  
Noninterest expense 472 504 989 1,005  
Debt termination expense   0 0 0  
Earnings before income taxes 3,376 2,335 6,736 6,732  
Goodwill 0 0 0 0  
Segment assets 404,236 348,570 404,236 348,570  
Operating Segments [Member] | Other [Member]          
Segment Reporting Information [Line Items]          
Net interest income 16,950 19,352 34,037 37,063  
(Recapture of) provision for loan losses (596) (1,454) (1,944) (3,766)  
Net interest income after (recapture of) provision for loan losses 17,546 20,806 35,981 40,829  
Noninterest income 4,011 5,424 11,581 8,884  
Noninterest expense 21,003 23,163 43,207 44,341  
Debt termination expense   0 0 0  
Earnings before income taxes 554 3,067 4,355 5,372  
Goodwill 0 0 0 0  
Segment assets $ 693,411 $ 755,523 $ 693,411 $ 755,523