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
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2014
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Interest income - held-to-maturity securities - taxable $ 36,789 $ 20,667  
Interest income - loans and leases 463,422 420,614  
Noninterest income - other income 30,132 21,918  
Income before income taxes 226,271 219,860  
Provision for income taxes (54,957) (54,006) $ (54,006)
Net income applicable to common shares 163,316 157,889  
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 464 121  
Income before income taxes 464 121  
Provision for income taxes (164) (42)  
Net income applicable to common shares 300 79  
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 644 123  
Provision for income taxes (224) (43)  
Net income applicable to common shares 420 80  
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 645 133  
Noninterest income - other income (1) (10)  
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 (1,785) (1,881)  
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 492 492  
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) (1,389)  
Provision for income taxes 452 486  
Net income applicable to common shares $ (841) $ (903)