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Regulatory Matters (Narrative) (Details)
Sep. 30, 2015
Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 risk based capital minimum capital percentage   4.00%
Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 effective on January 1, 2015    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common equity Tier 1 risk-based capital minimum capital requirement percentage 4.50%  
Tier 1 risk based capital minimum capital percentage 6.00%  
Total risk based capital minimum capital requirement percentage 8.00%  
Tier 1 leverage minimum capital requirement percentage 4.00%  
Tier 1 leverage capital to be well capitalized percentage 5.00%  
Common equity tier 1 risk-based to be well capitalized percentage 6.50%  
Tier 1 risk based capital to be well capitalized percentage 8.00%  
Total risk based capital to be well capitalized percentage 10.00%  
Astoria Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common equity Tier 1 risk-based capital minimum capital requirement percentage 4.50%  
Tier 1 risk based capital minimum capital percentage 6.00%  
Total risk based capital minimum capital requirement percentage 8.00%  
Tier 1 leverage minimum capital requirement percentage 4.00%  
Tier 1 leverage capital to be well capitalized percentage 5.00%  
Common equity tier 1 risk-based to be well capitalized percentage 6.50%  
Tier 1 risk based capital to be well capitalized percentage 8.00%  
Total risk based capital to be well capitalized percentage 10.00%  
Minimum capital ratios including conservation buffer, January 1, 2019 | Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 effective on January 1, 2015    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common equity Tier 1 risk-based capital minimum capital requirement percentage 7.00%  
Tier 1 risk based capital minimum capital percentage 8.50%  
Total risk based capital minimum capital requirement percentage 10.50%  
Required minimum conservation buffer percentage 2.50%  
On January 1, 2016 | Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 effective on January 1, 2015    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Required minimum conservation buffer percentage 0.625%  
On January 1, 2017 | Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 effective on January 1, 2015    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Required minimum conservation buffer percentage 1.25%  
On January 1, 2018 | Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 effective on January 1, 2015    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Required minimum conservation buffer percentage 1.875%