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Benefit Plans (Details 13) (Pension Benefits, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Benefit Plans      
Pension plan assets $ 160,683 $ 134,495 $ 129,352
Astoria Federal | Recurring basis
     
Benefit Plans      
Pension plan assets 160,683 134,495  
Astoria Federal | Recurring basis | Level 1
     
Benefit Plans      
Pension plan assets 8,469 7,495  
Astoria Federal | Recurring basis | Level 2
     
Benefit Plans      
Pension plan assets 145,037 120,436  
Astoria Federal | Recurring basis | Level 3
     
Benefit Plans      
Pension plan assets 7,177 6,564  
Astoria Federal | PRIAC Pooled Separate Accounts | Recurring basis
     
Benefit Plans      
Pension plan assets 145,037 120,436  
Astoria Federal | PRIAC Pooled Separate Accounts | Recurring basis | Level 2
     
Benefit Plans      
Pension plan assets 145,037 120,436  
Astoria Federal | Astoria Financial Corporation common stock | Recurring basis
     
Benefit Plans      
Pension plan assets 8,466 7,477  
Astoria Federal | Astoria Financial Corporation common stock | Recurring basis | Level 1
     
Benefit Plans      
Pension plan assets 8,466 7,477  
Astoria Federal | PRIAC Guaranteed Deposit Account | Recurring basis
     
Benefit Plans      
Pension plan assets 7,177 6,564  
Astoria Federal | PRIAC Guaranteed Deposit Account | Recurring basis | Level 3
     
Benefit Plans      
Pension plan assets 7,177 6,564  
Astoria Federal | Cash and Cash Equivalents | Recurring basis
     
Benefit Plans      
Pension plan assets 3 18  
Astoria Federal | Cash and Cash Equivalents | Recurring basis | Level 1
     
Benefit Plans      
Pension plan assets $ 3 $ 18