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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Interest income - held-to-maturity securities - taxable $ 48,743 $ 33,098 $ 138,214 $ 105,307
Noninterest income - net gains (losses) on sale of securities 71 1,031 3,781 1,763
Interest income - loans and leases 724,284 583,653 2,100,056 1,516,849
Noninterest income - other income 38,157 33,399 123,110 99,720
Noninterest expense - personnel costs (377,088) (405,024) (1,151,085) (989,369)
Income before income taxes 364,512 151,753 982,278 606,847
Provision for income taxes (89,944) (24,749) (227,875) (133,989)
Net income applicable to common shares 255,665 108,467 697,733 426,449
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 (1,498) (726) (7,388) 478
Noninterest income - net gains (losses) on sale of securities (7,113) 0 (7,502) 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 (104) 0 (3,687) (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 (8,715) (726) (18,577) 2,032
Provision for income taxes 3,082 257 6,570 (718)
Net income applicable to common shares (5,633) (469) (12,007) 1,314
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 (144) (123) (1,131) 770
Noninterest income - other income 0 0 0 (1)
Income before income taxes (144) (123) (1,131) 769
Provision for income taxes 51 44 396 (269)
Net income applicable to common shares (93) (79) (735) 500
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) (4,580) (5,355)
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 1,476 1,476
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) (3,104) (3,879)
Provision for income taxes 419 452 1,086 1,357
Net income applicable to common shares $ (779) $ (841) $ (2,018) $ (2,522)