Quarterly report pursuant to Section 13 or 15(d)

OTHER COMPREHENSIVE INCOME - Reclassifications (Details)

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OTHER COMPREHENSIVE INCOME - Reclassifications (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Interest income - held-to-maturity securities - taxable $ 35,420 $ 20,742 $ 72,209 $ 41,408
Interest income - loans and leases 469,770 436,564 933,192 857,177
Noninterest income - other income 36,187 38,938 66,319 60,856
Income before income taxes 228,823 260,263 455,094 480,123
Provision for income taxes (54,283) (64,057) (109,240) (118,063)
Net income applicable to common shares 154,666 188,238 317,982 346,127
Gain (Loss) on Sale of Securities, Net 732 82 732 82
Impairment losses recognized in earnings on available-for-sale securities 76 0 76 0
Unrealized gains and (losses) on debt securities | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Interest income - held-to-maturity securities - taxable 740 80 1,204 201
Income before income taxes 2,294 120 2,758 241
Provision for income taxes (811) (42) (975) (84)
Net income applicable to common shares 1,483 78 1,783 157
Gain (Loss) on Sale of Securities, Net 1,630 40 1,630 40
Impairment losses recognized in earnings on available-for-sale securities 76 0 76 0
Unrealized gains and (losses) on cash flow hedging derivatives | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Income before income taxes     892 261
Provision for income taxes     (313) (91)
Net income applicable to common shares     579 170
Unrealized gains and (losses) on cash flow hedging derivatives | Interest Rate Contract | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Interest income - loans and leases 248 118 893 251
Noninterest income - other income 0 20 (1) 10
Income before income taxes 248 138    
Provision for income taxes (89) (48)    
Net income applicable to common shares 159 90    
Amortization of defined benefit pension and post-retirement items: actuarial gains (losses) | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Amortization of defined benefit pension and post-retirement items     (3,570) (3,763)
Amortization of defined benefit pension and post-retirement items: Prior service credit | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Amortization of defined benefit pension and post-retirement items     984 984
Unrealized gains (losses) for pension and other post- retirement obligations | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Income before income taxes (1,293) (1,390) (2,586) (2,779)
Provision for income taxes 453 487 905 973
Net income applicable to common shares (840) (903) $ (1,681) $ (1,806)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax (1,785) (1,882)    
Prior service credit $ 492 $ 492