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Investments (Unrealized Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Investment securities available for sale:    
Less than 12 months, fair value $ 3,104,700 $ 664,243
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments 43,715 581
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 44,820 708
12 months or more, fair value 56,830 9,433
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments 1,105 127
Total fair value 3,161,530 673,676
U. S. Treasury
   
Investment securities available for sale:    
Less than 12 months, fair value 102,105 120,045
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments 45 12
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 45 12
12 months or more, fair value 0 0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments 0 0
Total fair value 102,105 120,045
Government Agency
   
Investment securities available for sale:    
Less than 12 months, fair value 780,552 407,498
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments 761 337
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 792 337
12 months or more, fair value 29,969 0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments 31 0
Total fair value 810,521 407,498
Mortgage Backed Securities, Other [Member]
   
Investment securities available for sale:    
Less than 12 months, fair value 2,221,213 135,880
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments 42,876 214
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 43,950 341
12 months or more, fair value 26,861 9,433
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments 1,074 127
Total fair value 2,248,074 145,313
Investment securities held to maturity:    
Less than 12 months, fair value 0 0
Held-to-maturity Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss 0 0
12 months or more, fair value 0 17
Held-to-maturity Securities Continuous Unrealized Loss Position 12 Months Or Longer Accumulated Loss 0 27
Total fair value 0 17
Held To Maturity Securities Accumulated Unrecognized Holding Loss 0 27
Other Debt Obligations
   
Investment securities available for sale:    
Less than 12 months, fair value 830 820
Available for Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments 33 18
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments 33 18
12 months or more, fair value 0 0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments 0 0
Total fair value 830 820
State, County and Municipal
   
Investment securities available for sale:    
Available For Sale Securities Gross Unrealized Loss Accumulated In Investments $ 0 $ 0