Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES (Significant unobservable Level 3 inputs) (Details 6)

v3.3.1.900
FAIR VALUES OF ASSETS AND LIABILITIES (Significant unobservable Level 3 inputs) (Details 6) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Assets measured at fair value on a recurring basis    
Derivatives $ (27,330) $ (51,973)
Available-for-sale and other securities 11,094,868 9,384,670
Liabilities measured at fair value on a recurring basis    
Derivative Assets $ (77,557) $ (101,197)
MSRs | Maximum | Cost Approach Valuation Technique | Level 3    
Quantitative information about level 3 fair value measurements    
Constant prepayment rate (CPR) 24.00% 26.00%
Spread over forward interest rate swap rates 1,166,000 900,000
MSRs | Minimum | Cost Approach Valuation Technique | Level 3    
Quantitative information about level 3 fair value measurements    
Constant prepayment rate (CPR) 6.00% 7.00%
Spread over forward interest rate swap rates 325,000 228,000
MSRs | Weighted Average | Cost Approach Valuation Technique | Level 3    
Quantitative information about level 3 fair value measurements    
Constant prepayment rate (CPR) 14.00% 16.00%
Spread over forward interest rate swap rates 599,000 546,000
Derivative Instruments | Maximum | Market Approach Valuation Technique | Level 3    
Quantitative information about level 3 fair value measurements    
Net market price 19.40% 17.50%
Estimated pull thru % 90.00% 91.00%
Derivative Instruments | Minimum | Market Approach Valuation Technique | Level 3    
Quantitative information about level 3 fair value measurements    
Net market price (3.60%) (5.10%)
Estimated pull thru % 50.00% 38.00%
Derivative Instruments | Weighted Average | Market Approach Valuation Technique | Level 3    
Quantitative information about level 3 fair value measurements    
Net market price 2.10% 1.70%
Estimated pull thru % 76.00% 75.00%
Municipal securities | Maximum | Cost Approach Valuation Technique | Level 3    
Quantitative information about level 3 fair value measurements    
Discount rate 4.70% 4.90%
Municipal securities | Minimum | Cost Approach Valuation Technique | Level 3    
Quantitative information about level 3 fair value measurements    
Discount rate 0.30% 0.50%
Municipal securities | Weighted Average | Cost Approach Valuation Technique | Level 3    
Quantitative information about level 3 fair value measurements    
Discount rate 2.60% 2.50%
Private label CMO | Maximum | Cost Approach Valuation Technique | Level 3    
Quantitative information about level 3 fair value measurements    
Constant prepayment rate (CPR) 0.00% 32.60%
Probability of default 0.00% 4.00%
Loss severity 0.00% 64.00%
Discount rate 0.00% 7.20%
Private label CMO | Minimum | Cost Approach Valuation Technique | Level 3    
Quantitative information about level 3 fair value measurements    
Constant prepayment rate (CPR) 0.00% 13.60%
Probability of default 0.00% 0.10%
Loss severity 0.00% 0.00%
Discount rate 0.00% 2.70%
Private label CMO | Weighted Average | Cost Approach Valuation Technique | Level 3    
Quantitative information about level 3 fair value measurements    
Constant prepayment rate (CPR) 0.00% 20.70%
Probability of default 0.00% 0.70%
Loss severity 0.00% 33.90%
Discount rate 0.00% 6.00%
Asset-backed Securities | Maximum | Cost Approach Valuation Technique | Level 3    
Quantitative information about level 3 fair value measurements    
Discount rate 11.30% 13.30%
Cumulative prepayment rate 100.00% 100.00%
Cumulative default 100.00% 100.00%
Loss given default 100.00% 100.00%
Cure given deferral 75.00% 75.00%
Asset-backed Securities | Minimum | Cost Approach Valuation Technique | Level 3    
Quantitative information about level 3 fair value measurements    
Discount rate 4.30% 4.30%
Cumulative prepayment rate 0.00% 0.00%
Cumulative default 1.70% 1.90%
Loss given default 85.00% 20.00%
Cure given deferral 0.00% 0.00%
Asset-backed Securities | Weighted Average | Cost Approach Valuation Technique | Level 3    
Quantitative information about level 3 fair value measurements    
Discount rate 5.80% 7.30%
Cumulative prepayment rate 8.30% 10.10%
Cumulative default 11.50% 15.90%
Loss given default 96.40% 94.40%
Cure given deferral 36.60% 32.60%
Automobile Loan | Maximum | Cost Approach Valuation Technique | Level 3    
Quantitative information about level 3 fair value measurements    
Constant prepayment rate (CPR) 79.20% 79.20%
Discount rate 5.00% 5.00%
Life of pool cumulative losses 210.00% 210.00%
Automobile Loan | Minimum | Cost Approach Valuation Technique | Level 3    
Quantitative information about level 3 fair value measurements    
Constant prepayment rate (CPR) 154.20% 154.20%
Discount rate 0.20% 0.20%
Life of pool cumulative losses 2.10% 2.10%
Automobile Loan | Weighted Average | Cost Approach Valuation Technique | Level 3    
Quantitative information about level 3 fair value measurements    
Constant prepayment rate (CPR) 154.20% 154.20%
Discount rate 2.30% 2.30%
Life of pool cumulative losses 2.10% 2.10%
Fair Value, Measurements, Recurring    
Assets measured at fair value on a recurring basis    
MSR's $ 18,065 $ 22,786
Derivatives 289,677 284,255
Available-for-sale and other securities 10,762,450 9,053,111
Automobile loans 2,563 10,590
Liabilities measured at fair value on a recurring basis    
Derivative Assets 451,584 352,642
Fair Value, Measurements, Recurring | Level 3    
Assets measured at fair value on a recurring basis    
MSR's 18,065 22,786
Derivatives 555 704
Available-for-sale and other securities 2,051,728 1,530,795
Automobile loans 2,563 10,590
Liabilities measured at fair value on a recurring basis    
Derivative Assets 8,339 4,064
Fair Value, Measurements, Recurring | Municipal securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 2,328,091 1,868,569
Fair Value, Measurements, Recurring | Municipal securities | Level 3    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 1,950,556 1,417,593
Fair Value, Measurements, Recurring | Private label CMO    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 41,926
Fair Value, Measurements, Recurring | Private label CMO | Level 3    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 0 30,464
Fair Value, Measurements, Recurring | Asset-backed Securities    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 814,009 955,998
Fair Value, Measurements, Recurring | Asset-backed Securities | Level 3    
Assets measured at fair value on a recurring basis    
Available-for-sale and other securities 101,172 82,738
Fair Value, Measurements, Nonrecurring    
Liabilities measured at fair value on a recurring basis    
Impaired loans Fair Value Disclosure 52,837 52,911
Accrued income and other assets Fair Value Disclosure 24,910 $ 35,039
Fair Value, Measurements, Nonrecurring | Level 3    
Liabilities measured at fair value on a recurring basis    
Impaired loans Fair Value Disclosure 52,837  
Accrued income and other assets Fair Value Disclosure $ 24,910