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Segment Results (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | $ 294,917 | $ 327,866 |
Recoveries of loan losses |  | (4,008) | (176) |
Non-interest income | [1] | 32,172 | 35,237 |
Non-interest expense | [2] | 166,943 | 158,448 |
Income before income taxes |  | 164,154 | 204,831 |
Income tax expense (benefit) |  | 60,197 | 74,922 |
Net income |  | 103,957 | 129,909 |
Identifiable segment assets (period-end) |  | 48,824,564 | 48,515,572 | $ 48,926,555
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income |  | 32,172 | 35,237 |
Banking Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | 292,277 | 324,917 |
Recoveries of loan losses |  | (4,008) | (176) |
Non-interest income | [1] | 21,869 | 30,586 |
Non-interest expense | [2] | 150,936 | 142,050 |
Income before income taxes |  | 163,459 | 209,517 |
Income tax expense (benefit) |  | 59,920 | 76,815 |
Net income |  | 103,539 | 132,702 |
Identifiable segment assets (period-end) |  | 48,285,443 | 47,739,937 |
Banking Operations | Inter-segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income |  | (3,759) | (4,112) |
Banking Operations | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income |  | 18,110 | 26,474 |
Residential Mortgage Banking |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest income |  | 2,640 | 2,949 |
Non-interest income | [1] | 10,303 | 4,651 |
Non-interest expense | [2] | 16,007 | 16,398 |
Income before income taxes |  | 695 | (4,686) |
Income tax expense (benefit) |  | 277 | (1,893) |
Net income |  | 418 | (2,793) |
Identifiable segment assets (period-end) |  | 539,121 | 775,635 |
Residential Mortgage Banking | Inter-segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income |  | 3,759 | 4,112 |
Residential Mortgage Banking | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Non-interest income |  | $ 14,062 | $ 8,763 |
[1] | Includes ancillary fee income.
[2] | Includes both direct and indirect expenses.

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