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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Interest income - held-to-maturity securities - taxable $ 44,276 $ 35,420 $ 89,471 $ 72,209
Noninterest income - net gains (losses) on sale of securities 3,694 732 3,710 732
Interest income - loans and leases 699,838 469,770 1,375,772 933,192
Noninterest income - other income 44,219 36,187 84,954 66,319
Noninterest expense - personnel costs (391,997) (298,949) (773,997) (584,346)
Income before income taxes 350,388 228,823 617,766 455,094
Provision for income taxes (78,647) (54,283) (137,931) (109,240)
Net income applicable to common shares 252,852 154,666 442,068 317,982
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 (2,284) 740 (5,890) 1,204
Noninterest income - net gains (losses) on sale of securities 1,855 1,630 (389) 1,630
Accumulated OTTI | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Noninterest income - net gains (losses) on sale of securities (3,559) (76) (3,583) (76)
Unrealized gains and (losses) on debt securities and Accumulated OTTI | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Income before income taxes (3,988) 2,294 (9,862) 2,758
Provision for income taxes 1,410 (811) 3,487 (975)
Net income applicable to common shares (2,578) 1,483 (6,375) 1,783
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 (427) 248 (987) 893
Noninterest income - other income 0 0 0 (1)
Income before income taxes (427) 248 (987) 892
Provision for income taxes 150 (89) 346 (313)
Net income applicable to common shares (277) 159 (641) 579
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]        
Noninterest expense - personnel costs (1,690) (1,785) (2,890) (3,570)
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]        
Noninterest expense - personnel costs 492 492 984 984
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 (1,198) (1,293) (1,906) (2,586)
Provision for income taxes 419 453 667 905
Net income applicable to common shares $ (779) $ (840) $ (1,239) $ (1,681)