Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Non-Recurring Basis (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Non-Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt $ 9,279,140 $ 8,309,159
Held-to-maturity securities 7,533,517 7,806,939
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 66,425,689 66,323,583
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 9,419,853 8,387,444
Held-to-maturity securities 7,502,102 7,787,268
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 66,275,735 66,294,639
Level 1 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 0 0
Held-to-maturity securities 0 0
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 0 0
Level 2 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 9,013,768 7,980,176
Held-to-maturity securities 7,502,102 7,787,268
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 0 0
Level 3 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 406,085 407,268
Held-to-maturity securities 0 0
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 66,275,735 66,294,639
Nonrecurring Basis    
Assets measured at fair value on a nonrecurring basis    
Impaired loans   53,818
Nonrecurring Basis | Fair Value    
Assets measured at fair value on a nonrecurring basis    
MSRs (176,747)  
Impaired loans 52,367  
Other real estate owned (49,887)  
Nonrecurring Basis | Total Gains/(Losses)    
Assets measured at fair value on a nonrecurring basis    
MSRs 1,800  
Impaired loans 5,267  
Other real estate owned 2,363  
Nonrecurring Basis | Level 1 | Fair Value    
Assets measured at fair value on a nonrecurring basis    
MSRs 0  
Impaired loans 0  
Other real estate owned 0  
Nonrecurring Basis | Level 2 | Fair Value    
Assets measured at fair value on a nonrecurring basis    
MSRs 0  
Impaired loans 0  
Other real estate owned 0  
Nonrecurring Basis | Level 3    
Assets measured at fair value on a nonrecurring basis    
MSRs   $ (171,309)
Nonrecurring Basis | Level 3 | Fair Value    
Assets measured at fair value on a nonrecurring basis    
MSRs (176,747)  
Impaired loans 52,367  
Other real estate owned $ (49,887)