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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

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