Other Comprehensive Income (Loss) (Details 2) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2016 |
Jun. 30, 2015 |
Jun. 30, 2016 |
Jun. 30, 2015 |
||||||
| Tax benefit | $ 7,022 | $ 9,030 | $ 13,989 | $ 15,290 | |||||
| Net of tax | 14,603 | 17,422 | 28,816 | 30,135 | |||||
| Amount Reclassified from Accumulated Other Comprehensive (Loss) Income [Member] | Available for Sale Securities [Member] | |||||||||
| Net gain on securities transactions | [1] | 240 | 723 | 472 | 1,013 | ||||
| Tax benefit | [1] | (96) | (289) | (189) | (405) | ||||
| Net of tax | [1] | 144 | 434 | 283 | 608 | ||||
| Amount Reclassified from Accumulated Other Comprehensive (Loss) Income [Member] | Employee Benefit Plans [Member] | |||||||||
| Net retirement plan actuarial loss | [1],[2] | (326) | (729) | (669) | (1,462) | ||||
| Net retirement plan prior service credit | [1],[2] | (8) | 190 | (38) | 369 | ||||
| Amortization, Total before tax | [1] | (334) | (539) | (707) | (1,093) | ||||
| Tax benefit | [1] | 134 | 214 | 283 | 436 | ||||
| Net of tax | [1] | $ (200) | $ (325) | $ (424) | $ (657) | ||||
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