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
 3 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt $ 7,929,820 $ 7,041,364
Held-to-maturity securities 5,658,565 6,159,590
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 51,920,357 49,743,256
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 7,987,748 7,043,014
Held-to-maturity securities 5,786,224 6,135,458
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 50,790,280 48,024,998
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 0 0
Held-to-maturity securities 5,786,224 6,135,458
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 7,987,748 7,043,014
Held-to-maturity securities 0 0
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 50,790,280 48,024,998
Nonrecurring Basis    
Assets measured at fair value on a nonrecurring basis    
Impaired loans   $ 62,029
Nonrecurring Basis | Fair Value    
Assets measured at fair value on a nonrecurring basis    
MSRs (120,091)  
Impaired loans 43,202  
Other real estate owned (28,901)  
Nonrecurring Basis | Total Gains/(Losses)    
Assets measured at fair value on a nonrecurring basis    
MSRs (23,636)  
Impaired loans 5,822  
Other real estate owned (1,220)  
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    
Gain Losses MSRs (7,296)  
Gain Losses Impaired Loans 4,405  
Gain Losses Accrued Income And Other Assets (715)  
Nonrecurring Basis | Level 3 | Fair Value    
Assets measured at fair value on a nonrecurring basis    
MSRs (120,091)  
Impaired loans 43,202  
Other real estate owned $ (28,901)