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
Sep. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt $ 9,200,707 $ 8,309,159
Held-to-maturity securities 8,688,399 7,806,939
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 67,911,810 66,323,583
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 9,402,926 8,387,444
Held-to-maturity securities 8,655,805 7,787,268
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 67,698,855 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 8,992,820 7,980,176
Held-to-maturity securities 8,655,805 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 410,106 407,268
Held-to-maturity securities 0 0
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 67,698,855 66,294,639
Nonrecurring Basis    
Assets measured at fair value on a nonrecurring basis    
Impaired loans   (53,818)
Other real estate owned   (50,930)
Nonrecurring Basis | Fair Value    
Assets measured at fair value on a nonrecurring basis    
MSRs 182,043  
Impaired loans (68,159)  
Other real estate owned (42,041)  
Nonrecurring Basis | Total Gains/(Losses)    
Assets measured at fair value on a nonrecurring basis    
MSRs (318)  
Impaired loans 3,976  
Other real estate owned 1,759  
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 182,043  
Impaired loans (68,159)  
Other real estate owned $ (42,041)