Accumulated Other Comprehensive Income (Loss) (Reclassifications Out of AOCI) (Detail) - USD ($)
$ in Thousands |
3 Months Ended |
Mar. 31, 2016 |
Mar. 31, 2015 |
| Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |
|
|
|
| Tax effect |
|
$ 22,920
|
$ 21,152
|
| Reclassifications out of AOCI |
|
(7,925)
|
(10,142)
|
| Unrealized Gains (Losses) on Securities |
|
|
|
| Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |
|
|
|
| Reclassifications out of AOCI |
|
(2,099)
|
(2,691)
|
| Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent |
|
|
|
| Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |
|
|
|
| Reclassifications out of AOCI |
[1] |
(7,037)
|
(8,492)
|
| Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent |
|
|
|
| Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |
|
|
|
| Reclassifications out of AOCI |
[1] |
1,211
|
1,041
|
| Accumulated Defined Benefit Plans Adjustment Attributable to Parent |
|
|
|
| Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |
|
|
|
| Reclassifications out of AOCI |
|
(5,826)
|
(7,451)
|
| Tax effect |
|
2,230
|
2,851
|
| Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Securities |
|
|
|
| Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |
|
|
|
| Net realized gains (losses) on sales of securities |
|
(1,614)
|
(2,691)
|
| Net other-than-temporary impairment losses |
|
(485)
|
|
| Pretax total |
|
(2,099)
|
(2,691)
|
| Tax effect |
|
$ 812
|
$ 955
|
|
|