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
Mar. 31, 2016
Mar. 31, 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 58,751 60,716
Amounts reclassified from accumulated OCI to earnings 121 744
Period change   61,460
Balance, end of period 7,157,670 6,461,954
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 49,434 42,416
Amounts reclassified from accumulated OCI to earnings (300) (79)
Period change 49,134 42,337
Balance, end of period 57,495 57,474
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 68 6
Amounts reclassified from accumulated OCI to earnings 0 0
Period change 68 6
Balance, end of period 244 490
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 9,249 18,294
Amounts reclassified from accumulated OCI to earnings (420) (80)
Period change 8,829 18,214
Balance, end of period 4,881 5,981
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 841 903
Period change 841 903
Balance, end of period (229,906) (224,777)
Accumulated Other Comprehensive Loss    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance, beginning of period (226,158) (222,292)
Period change 58,872  
Balance, end of period (167,286) (160,832)
Reclassification out of Accumulated Other Comprehensive Income    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Net unrealized loss on securities transfer $ 8,000 $ 9,000