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Investment Securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Available-for-Sale    
Fair Value, Less than 12 months $ 233,909 $ 899,603
Gross Unrealized Holding Losses, Less than 12 months 1,206 16,803
Fair Value, 12 months or longer 0 5,585
Gross Unrealized Holding Losses, 12 months or longer 0 899
Fair Value 233,909 905,188
Gross Unrealized Holding Losses 1,206 17,702
CMO [Member]
   
Held-To-Maturity    
Fair Value, Less than 12 months 2,383 0
Gross Unrealized Holding Losses, Less than 12 months 0 0
Fair Value, 12 months or longer 0 3,143
Gross unrealized holding losses, 12 months or longer 0 401
Fair Value 2,383 3,143
Gross Unrealized Holding Losses 0 401
Government Agency [Member]
   
Available-for-Sale    
Fair Value, Less than 12 months 0 79,635
Gross Unrealized Holding Losses, Less than 12 months 0 214
Fair Value, 12 months or longer 0 0
Gross Unrealized Holding Losses, 12 months or longer 0 0
Fair Value 0 79,635
Gross Unrealized Holding Losses 0 214
Residential mortgage-backed securities[Member]
   
Available-for-Sale    
Fair Value, Less than 12 months 75,754 449,806
Gross Unrealized Holding Losses, Less than 12 months 334 6,366
Fair Value, 12 months or longer 0 0
Gross Unrealized Holding Losses, 12 months or longer 0 0
Fair Value 75,754 449,806
Gross Unrealized Holding Losses 334 6,366
CMO's / REMIC's - Residential [Member]
   
Available-for-Sale    
Fair Value, Less than 12 months 133,471 144,234
Gross Unrealized Holding Losses, Less than 12 months 665 1,379
Fair Value, 12 months or longer 0 0
Gross Unrealized Holding Losses, 12 months or longer 0 0
Fair Value 133,471 144,234
Gross Unrealized Holding Losses 665 1,379
Municipal Bonds [Member]
   
Available-for-Sale    
Fair Value, Less than 12 months 22,184 225,928
Gross Unrealized Holding Losses, Less than 12 months 203 8,844
Fair Value, 12 months or longer 0 5,585
Gross Unrealized Holding Losses, 12 months or longer 0 899
Fair Value 22,184 231,513
Gross Unrealized Holding Losses 203 9,743
Other Securities [Member]
   
Available-for-Sale    
Fair Value, Less than 12 months 2,500  
Gross Unrealized Holding Losses, Less than 12 months 4  
Fair Value, 12 months or longer 0  
Gross Unrealized Holding Losses, 12 months or longer 0  
Fair Value 2,500  
Gross Unrealized Holding Losses $ 4