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Business Segments - Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Net interest income | $ 70,521 | $ 65,433 |
(Recapture of) provision for loan losses | (1,000) | (4,500) |
Net interest income after (recapture of) provision for loan losses | 71,521 | 69,933 |
Noninterest income | 12,916 | 8,722 |
Noninterest expense | 35,946 | 34,117 |
Earnings before income taxes | 48,491 | 44,538 |
Goodwill | 116,564 | 119,193 | $ 116,564
Segment assets | 8,356,160 | 8,559,121 | $ 8,270,586
Operating Segments [Member] | Centers [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 49,583 | 45,578 |
(Recapture of) provision for loan losses | 329 | 511 |
Net interest income after (recapture of) provision for loan losses | 49,254 | 45,067 |
Noninterest income | 5,301 | 5,207 |
Noninterest expense | 13,225 | 12,438 |
Earnings before income taxes | 41,330 | 37,836 |
Goodwill | 116,564 | 119,193 |
Segment assets | 7,231,624 | 7,399,909 |
Operating Segments [Member] | Dairy & Livestock and Agribusiness [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 3,851 | 2,144 |
(Recapture of) provision for loan losses | 19 | (2,699) |
Net interest income after (recapture of) provision for loan losses | 3,832 | 4,843 |
Noninterest income | 45 | 55 |
Noninterest expense | 517 | 501 |
Earnings before income taxes | 3,360 | 4,397 |
Goodwill | 0 | 0 |
Segment assets | 407,527 | 363,029 |
Operating Segments [Member] | Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 17,087 | 17,711 |
(Recapture of) provision for loan losses | (1,348) | (2,312) |
Net interest income after (recapture of) provision for loan losses | 18,435 | 20,023 |
Noninterest income | 7,570 | 3,460 |
Noninterest expense | 22,204 | 21,178 |
Earnings before income taxes | 3,801 | 2,305 |
Goodwill | 0 | 0 |
Segment assets | $ 717,009 | $ 796,183 |

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