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Investment Securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Held-To-Maturity    
Fair Value, 12 months or longer     
Gross unrealized holding losses, 12 months or longer     
Available-for-Sale    
Fair Value, Less than 12 months 294,924 233,909
Gross Unrealized Holding Losses, Less than 12 months 1,812 1,206
Fair Value, 12 months or longer     
Gross Unrealized Holding Losses, 12 months or longer     
Fair Value 294,924 233,909
Gross Unrealized Holding Losses 1,812 1,206
CMO [Member]
   
Held-To-Maturity    
Fair Value, Less than 12 months 2,280 2,383
Fair Value, 12 months or longer      
Gross unrealized holding losses, 12 months or longer      
Fair Value 2,280 2,383
Government Agency [Member]
   
Held-To-Maturity    
Fair Value, 12 months or longer     
Gross unrealized holding losses, 12 months or longer     
Available-for-Sale    
Fair Value, Less than 12 months 10,977  
Gross Unrealized Holding Losses, Less than 12 months 4  
Fair Value, 12 months or longer     
Gross Unrealized Holding Losses, 12 months or longer     
Fair Value 10,977  
Gross Unrealized Holding Losses 4  
Residential mortgage-backed securities[Member]
   
Held-To-Maturity    
Fair Value, 12 months or longer     
Gross unrealized holding losses, 12 months or longer     
Available-for-Sale    
Fair Value, Less than 12 months 55,729 75,754
Gross Unrealized Holding Losses, Less than 12 months 135 334
Fair Value, 12 months or longer     
Gross Unrealized Holding Losses, 12 months or longer     
Fair Value 55,729 75,754
Gross Unrealized Holding Losses 135 334
CMO's / REMIC's - Residential [Member]
   
Held-To-Maturity    
Fair Value, 12 months or longer     
Gross unrealized holding losses, 12 months or longer     
Available-for-Sale    
Fair Value, Less than 12 months 196,395 133,471
Gross Unrealized Holding Losses, Less than 12 months 1,050 665
Fair Value, 12 months or longer     
Gross Unrealized Holding Losses, 12 months or longer     
Fair Value 196,395 133,471
Gross Unrealized Holding Losses 1,050 665
Municipal Bonds [Member]
   
Held-To-Maturity    
Fair Value, 12 months or longer     
Gross unrealized holding losses, 12 months or longer     
Available-for-Sale    
Fair Value, Less than 12 months 31,823 22,184
Gross Unrealized Holding Losses, Less than 12 months 623 203
Fair Value, 12 months or longer     
Gross Unrealized Holding Losses, 12 months or longer     
Fair Value 31,823 22,184
Gross Unrealized Holding Losses 623 203
Other Securities [Member]
   
Held-To-Maturity    
Fair Value, 12 months or longer     
Gross unrealized holding losses, 12 months or longer     
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     
Gross Unrealized Holding Losses, 12 months or longer     
Fair Value    2,500
Gross Unrealized Holding Losses    $ 4