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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Amounts reclassified out of each component of accumulated other comprehensive income                      
Investment securities gains (losses)         $ 0 $ 0 $ (1,866) $ 0 $ 0 $ (1,866) $ 240
Tax benefit                 (25,228) (27,088) (20,389)
Interest income $ 42,255 $ 41,765 $ 41,870 $ 41,249 39,916 39,442 38,896 37,781 167,139 156,035 149,809
Amortization of net actuarial losses                 (1,599) (1,688) (1,070)
Amortization of net transition obligation                 (17) (16) (17)
Amortization of net transition obligation                 (18) (18) (18)
Settlement, before tax                 3,847    
Total reclassifications for the period $ 12,208 $ 11,466 $ 12,137 $ 11,181 $ 10,932 $ 12,206 $ 12,335 $ 10,395 46,992 45,868 40,453
Amount Reclassified from AOCI                      
Amounts reclassified out of each component of accumulated other comprehensive income                      
Total reclassifications for the period                 (3,306) (2,160) (1,295)
Investment Securities | Amount Reclassified from AOCI                      
Amounts reclassified out of each component of accumulated other comprehensive income                      
Investment securities gains (losses)                 0 (1,866) (1,071)
Tax benefit                 0 742 426
Net of tax                 0 (1,124) (645)
Defined Benefit Plans | Amount Reclassified from AOCI                      
Amounts reclassified out of each component of accumulated other comprehensive income                      
Tax benefit                 2,175 686 455
Amortization of net actuarial losses                 (1,599) (1,688) (1,070)
Amortization of net transition obligation                 (17) (16) (17)
Amortization of net transition obligation                 (18) (18) (18)
Settlement, before tax                 3,847 0 0
Total before tax                 (5,481) (1,722) (1,105)
Net of tax                 $ (3,306) $ (1,036) $ (650)