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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified Out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Amounts reclassified out of each component of accumulated other comprehensive income                      
Investment securities gains (losses) $ 0 $ (1,866) $ 0 $ 0 $ 0 $ 240 $ 0 $ (1,866) $ 240 $ 482
Tax (expense) benefit                 (27,088) (20,389) 112,247
Interest income 39,916 $ 39,442 38,896 37,781 37,741 37,139 37,536 37,393 156,035 149,809 140,278
Amortization of net actuarial losses                 (1,688) (1,070) (2,461)
Net transition obligation                 (16) (17) (17)
Net transition obligation                 (18) (18) (18)
Total reclassifications for the period $ 10,932 $ 12,206 $ 12,335 $ 10,395 $ 13,265 $ 8,230 $ 9,150 $ 9,808 45,868 40,453 172,075
Amount Reclassified from AOCI                      
Amounts reclassified out of each component of accumulated other comprehensive income                      
Total reclassifications for the period                 (2,160) (1,295) (8,734)
Investment Securities | Amount Reclassified from AOCI                      
Amounts reclassified out of each component of accumulated other comprehensive income                      
Investment securities gains (losses)                 (1,866) (1,071) 6,266
Tax (expense) benefit                 742 426 (2,511)
Net of tax                 (1,124) (645) 3,755
Derivatives | Amount Reclassified from AOCI                      
Amounts reclassified out of each component of accumulated other comprehensive income                      
Tax (expense) benefit                 0 0 (10,599)
Interest income                 0 0 (394)
Net of tax                 0 0 (10,993)
Defined Benefit Plans | Amount Reclassified from AOCI                      
Amounts reclassified out of each component of accumulated other comprehensive income                      
Tax (expense) benefit                 686 455 1,000
Amortization of net actuarial losses                 (1,688) (1,070) (2,461)
Net transition obligation                 (16) (17) (17)
Net transition obligation                 (18) (18) (18)
Total before tax                 (1,722) (1,105) (2,496)
Net of tax                 $ (1,036) $ (650) $ (1,496)