Annual report pursuant to Section 13 and 15(d)

OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details)

v3.6.0.2
OTHER COMPREHENSIVE INCOME - AOCI Roll Forward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 6,594,606 $ 6,328,170 $ 6,090,153
Other comprehensive income before reclassifications (130,205) 3,880  
Amounts reclassified from accumulated OCI to earnings (44,653) (7,746)  
Period change (174,858) (3,866)  
Ending balance 10,308,146 6,594,606 6,328,170
AOCI attributable to parent      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (226,158) (222,292) (214,009)
Ending balance (401,016) (226,158) (222,292)
Unrealized gains and (losses) on securities | Debt securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 8,361 15,137  
Other comprehensive income before reclassifications (131,864) (4,240)  
Amounts reclassified from accumulated OCI to earnings (69,261) (2,536)  
Period change (201,125) (6,776)  
Ending balance (192,764) 8,361 15,137
Unrealized gains and (losses) on securities | Equity securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 176 484  
Other comprehensive income before reclassifications 111 (308)  
Amounts reclassified from accumulated OCI to earnings 0 0  
Period change 111 (308)  
Ending balance 287 176 484
Unrealized gains and (losses) on cash flow hedging derivatives      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (3,948) (12,233)  
Other comprehensive income before reclassifications 1,548 8,428  
Amounts reclassified from accumulated OCI to earnings (234) (143)  
Period change 1,314 8,285  
Ending balance (2,634) (3,948) (12,233)
Unrealized gains (losses) for pension and other post- retirement obligations      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (230,747) (225,680)  
Other comprehensive income before reclassifications 0 0  
Amounts reclassified from accumulated OCI to earnings 24,842 (5,067)  
Period change 24,842 (5,067)  
Ending balance (205,905) (230,747) $ (225,680)
Reclassification out of Accumulated Other Comprehensive Income      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Transferred from AFS to HTM (82,000)    
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 (69,261) (2,536)  
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 (234) (143)  
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 $ 24,842 $ (5,067)