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Financial Derivatives Narrative (Details) (USD $)
3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2012
Excluding netting [Member]
Mar. 31, 2013
Uncollateralized [Member]
Dec. 31, 2012
Uncollateralized [Member]
Mar. 31, 2013
Cash [Member]
Dec. 31, 2012
Cash [Member]
Mar. 31, 2013
Zions First National Bank [Member]
Basis Swap [Member]
Mar. 31, 2012
Zions First National Bank [Member]
Basis Swap [Member]
Dec. 31, 2012
Zions First National Bank [Member]
Basis Swap [Member]
Mar. 31, 2013
Designated as Hedging Instrument [Member]
Interest Rate Swap, Pay Fixed Non-Callable [Member]
Dec. 31, 2012
Designated as Hedging Instrument [Member]
Interest Rate Swap, Pay Fixed Non-Callable [Member]
Mar. 31, 2013
Not Designated as Hedging Instrument [Member]
Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Mar. 31, 2013
Not Designated as Hedging Instrument [Member]
Interest Rate Swap, Receive Fixed Non-Callable [Member]
Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Interest Rate Swap, Receive Fixed Non-Callable [Member]
Mar. 31, 2013
Not Designated as Hedging Instrument [Member]
Interest Rate Swap, Pay Fixed Non-Callable [Member]
Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Interest Rate Swap, Pay Fixed Non-Callable [Member]
Mar. 31, 2013
Not Designated as Hedging Instrument [Member]
Basis Swap [Member]
Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Basis Swap [Member]
Mar. 31, 2013
Not Designated as Hedging Instrument [Member]
Interest Rate Swap, Receive Fixed Callable [Member]
Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Interest Rate Swap, Receive Fixed Callable [Member]
Mar. 31, 2013
Not Designated as Hedging Instrument [Member]
Agency Forward [Member]
Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Agency Forward [Member]
Mar. 31, 2013
Not Designated as Hedging Instrument [Member]
Treasury Futures [Member]
Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Treasury Futures [Member]
Mar. 31, 2013
Including accrued interest [Member]
Excluding netting [Member]
Dec. 31, 2012
Including accrued interest [Member]
Excluding netting [Member]
Mar. 31, 2013
Including accrued interest [Member]
Netting [Member]
Dec. 31, 2012
Including accrued interest [Member]
Netting [Member]
Mar. 31, 2013
Including accrued interest [Member]
Counterparty level [Member]
Netting [Member]
Dec. 31, 2012
Including accrued interest [Member]
Counterparty level [Member]
Netting [Member]
Derivative [Line Items]                                                                
Notional Amount of Interest Rate Fair Value Hedge Derivatives                     $ 950,000,000 $ 950,000,000                                        
Fair Value Hedge Assets                     0 0                                        
Fair Value Hedge Liabilities                     52,967,000 58,758,000                                        
Derivative Liability, Fair Value, Gross Liability (133,838,000) (150,682,000)                         (446,000) (211,000) (80,097,000) (91,205,000) (642,000) (784,000) (429,000) (238,000) (1,000) (58,000) 0 (12,000) (142,400,000) (168,000,000)     (109,300,000) (135,800,000)
Obligation to Return Securities Received as Collateral           1,495,000 1,650,000                                                  
Derivative Assets (24,759,000) (29,523,000)                                                            
Derivative, Weighted-Average Forward Price                                             $ 99.83 $ 101.22 $ 132.08 $ 129.77            
Derivative, Weighted-Average Pay Rate                     2.20%       0.32% 0.33% 4.85% 4.83% 0.37% 0.43% 0.14% 0.15%                    
Credit exposure to interest rate swap counterparties     37,100,000 1,200,000 800,000                                           35,800,000   2,700,000 2,400,000    
Collateral Already Posted, Aggregate Fair Value           36,711,000 60,311,000                                                  
Additional Collateral, Aggregate Fair Value 72,600,000 75,500,000                                                            
Derivative, Notional Amount 6,912,555,000 6,815,268,000           40,200,000   49,300,000         4,355,623,000 4,135,149,000 749,874,000 805,622,000 550,223,000 609,262,000 290,000,000 245,000,000 2,435,000 59,035,000 14,400,000 11,200,000            
Derivative, Fair Value, Net               (500,000)   (700,000)                                            
Gain (Loss) on Derivative Instruments, Net, Pretax               200,000 100,000                                              
Derivative, Weighted-Average Receive Rate                     0.30%       0.81% 0.85% 0.29% 0.32% 0.31% 0.36% 0.58% 0.55%                    
Financial derivatives, at fair value 26,254,000 31,173,000                         25,075,000 30,338,000 857,000 357,000 375,000 499,000 0 6,000 0 0 13,000 0            
Derivative Credit Risk Valuation Adjustment, Derivative Assets                         (66,000) (27,000)                                    
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities                         (744,000) (584,000)                                    
Derivative Liabilities $ (97,127,000) $ (90,371,000)