Annual report pursuant to Section 13 and 15(d)

OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details)

v3.3.1.900
OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 6,328,170 $ 6,090,153 $ 5,778,500
Other comprehensive income before reclassifications 3,880 73,868  
Amounts reclassified from accumulated OCI to earnings (7,746) (82,151)  
Period change (3,866) (8,283)  
Ending balance 6,594,606 6,328,170 6,090,153
AOCI attributable to parent      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (222,292) (214,009) (150,817)
Ending balance (226,158) (222,292) (214,009)
Unrealized gains and (losses) on securities | Debt securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 15,137 (39,234)  
Other comprehensive income before reclassifications (4,240) 64,484  
Amounts reclassified from accumulated OCI to earnings (2,536) (10,113)  
Period change (6,776) 54,371  
Ending balance 8,361 15,137 (39,234)
Unrealized gains and (losses) on securities | Equity securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 484 292  
Other comprehensive income before reclassifications (308) 192  
Amounts reclassified from accumulated OCI to earnings 0 0  
Period change (308) 192  
Ending balance 176 484 292
Unrealized gains and (losses) on cash flow hedging derivatives      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (12,233) (18,844)  
Other comprehensive income before reclassifications 8,428 9,192  
Amounts reclassified from accumulated OCI to earnings (143) (2,581)  
Period change 8,285 6,611  
Ending balance (3,948) (12,233) (18,844)
Unrealized gains (losses) for pension and other post- retirement obligations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (225,680) (156,223)  
Other comprehensive income before reclassifications 0 0  
Amounts reclassified from accumulated OCI to earnings (5,067) (69,457)  
Period change (5,067) (69,457)  
Ending balance (230,747) (225,680) $ (156,223)
Reclassification out of Accumulated Other Comprehensive Income      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Transferred from AFS to HTM 9,000    
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gains and (losses) on securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Amounts reclassified from accumulated OCI to earnings (2,536) (10,113)  
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gains and (losses) on cash flow hedging derivatives      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Amounts reclassified from accumulated OCI to earnings (143) (2,581)  
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gains (losses) for pension and other post- retirement obligations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Amounts reclassified from accumulated OCI to earnings $ (5,067) $ (69,457)