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Investment Securities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Available-for-Sale    
Amortized Cost $ 135,002 $ 79,513
Gross Unrealized Gains 671 586
Gross Unrealized Losses (916) (962)
Fair Value 134,757 79,137
Held-to-Maturity    
Amortized Cost 0 319,547
Fair Value   330,809
U.S. Treasury and government agency [Member]
   
Available-for-Sale    
Amortized Cost   1,002
Gross Unrealized Gains   0
Gross Unrealized Losses   (1)
Fair Value   1,001
Mortgage-backed Securities [Member]
   
Available-for-Sale    
Amortized Cost 107,360 55,818
Gross Unrealized Gains 661 581
Gross Unrealized Losses (113) (107)
Fair Value 107,908 56,292
Held-to-Maturity    
Amortized Cost   319,547
Gross Unrealized Gains   11,262
Fair Value   330,809
Gross Unrealized Losses   0
Asset-backed securities [Member]
   
Available-for-Sale    
Amortized Cost 574 622
Gross Unrealized Gains 8 5
Gross Unrealized Losses 0 0
Fair Value 582 627
Municipal securities [Member]
   
Available-for-Sale    
Amortized Cost 2,062 2,071
Gross Unrealized Gains 2 0
Gross Unrealized Losses (6) (71)
Fair Value 2,058 2,000
Corporate notes [Member]
   
Available-for-Sale    
Amortized Cost 25,000 20,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses (797) (783)
Fair Value 24,203 19,217
Equity [Member]
   
Available-for-Sale    
Amortized Cost 6  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value $ 6