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Bank subsidiary (Details 5) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Available-for-sale securities    
Amortized cost $ 536,430 $ 653,492
Gross unrealized gains 8,731 18,070
Gross unrealized losses (9,897) (204)
Total available for sale securities 535,264 671,358
Available-for-sale Securities, Continuous Unrealized Loss Position    
Fair value, less than 12 months 221,279 32,269
Gross unrealized losses, less than 12 months (9,749) (204)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,910 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (148) 0
Federal agency obligations
   
Available-for-sale securities    
Amortized cost 99,812 168,324
Gross unrealized gains 389 3,167
Gross unrealized losses (1,936) 0
Total available for sale securities 98,265 171,491
Available-for-sale Securities, Continuous Unrealized Loss Position    
Fair value, less than 12 months 29,755 0
Gross unrealized losses, less than 12 months (1,936) 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses 0  
Mortgage-related securities - FNMA, FHLMC and GNMA
   
Available-for-sale securities    
Amortized cost 359,437 407,175
Gross unrealized gains 6,308 10,412
Gross unrealized losses (7,768) (204)
Total available for sale securities 357,977 417,383
Available-for-sale Securities, Continuous Unrealized Loss Position    
Fair value, less than 12 months 164,998 32,269
Gross unrealized losses, less than 12 months (7,620) (204)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,910  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses (148)  
Municipal bonds
   
Available-for-sale securities    
Amortized cost 77,181 77,993
Gross unrealized gains 2,034 4,491
Gross unrealized losses (193) 0
Total available for sale securities 79,022 82,484
Available-for-sale Securities, Continuous Unrealized Loss Position    
Fair value, less than 12 months 26,526 0
Gross unrealized losses, less than 12 months (193) 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses $ 0