Quarterly report pursuant to Section 13 or 15(d)

OTHER COMPREHENSIVE INCOME OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details)

v3.5.0.2
OTHER COMPREHENSIVE INCOME OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning of period   $ 6,594,606 $ 6,328,170
Other comprehensive income before reclassifications   53,275 85,695
Amounts reclassified from accumulated OCI to earnings   708 (3,142)
Period change     82,553
Balance, end of period $ 10,386,765 10,386,765 6,582,637
Unrealized gains and (losses) on debt securities | Debt Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning of period   8,361 15,137
Other comprehensive income before reclassifications   47,934 59,737
Amounts reclassified from accumulated OCI to earnings   (1,314) (2,582)
Period change 46,620   57,155
Balance, end of period 54,981 54,981 72,292
Unrealized gains and (losses) on debt securities | Equity Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning of period   176 484
Other comprehensive income before reclassifications   110 (99)
Amounts reclassified from accumulated OCI to earnings   0 0
Period change 110   (99)
Balance, end of period 286 286 385
Unrealized gains and (losses) on cash flow hedging derivatives      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning of period   (3,948) (12,233)
Other comprehensive income before reclassifications   5,231 26,057
Amounts reclassified from accumulated OCI to earnings   (500) (217)
Period change 4,731   25,840
Balance, end of period 783 783 13,607
Unrealized gains (losses) for pension and other post- retirement obligations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning of period   (230,747) (225,680)
Other comprehensive income before reclassifications   0 0
Amounts reclassified from accumulated OCI to earnings   2,522 (343)
Period change 2,522   (343)
Balance, end of period (228,225) (228,225) (226,023)
Accumulated Other Comprehensive Loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning of period   (226,158) (222,292)
Period change 53,983    
Balance, end of period $ (172,175) (172,175) (139,739)
Reclassification out of Accumulated Other Comprehensive Income      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Net unrealized loss on securities transfer   $ 7,000 $ 9,000