Quarterly report pursuant to Section 13 or 15(d)

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

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OTHER COMPREHENSIVE INCOME OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 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   92,797 35,163
Amounts reclassified from accumulated OCI to earnings   (681) 1,479
Period change     36,642
Balance, end of period $ 7,507,304 7,507,304 6,496,258
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   82,145 17,391
Amounts reclassified from accumulated OCI to earnings   (1,783) (157)
Period change 80,362   17,234
Balance, end of period 88,723 88,723 32,371
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 16
Amounts reclassified from accumulated OCI to earnings   0 0
Period change 110   16
Balance, end of period 286 286 500
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   10,542 17,756
Amounts reclassified from accumulated OCI to earnings   (579) (170)
Period change 9,963   17,586
Balance, end of period 6,015 6,015 5,353
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   1,681 1,806
Period change 1,681   1,806
Balance, end of period (229,066) (229,066) (223,874)
Accumulated Other Comprehensive Loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance, beginning of period   (226,158) (222,292)
Period change 92,116    
Balance, end of period $ (134,042) (134,042) (185,650)
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