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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

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