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Regulatory Matters - Narrative (Details)
Dec. 31, 2015
Jan. 01, 2015
Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Minimum common equity Tier 1 risk-based capital ratio 4.50% 4.50%  
Tier 1 risk based capital minimum capital requirement percentage 6.00% 6.00%  
Total risk based capital minimum capital requirement percentage 8.00% 8.00%  
Tier 1 leverage capital minimum capital requirement percentage 4.00% 4.00%  
Tier 1 leverage capital to be well capitalized percentage 5.00% 5.00%  
Common equity Tier 1 risk based capital to be well capitalized percentage 6.50% 6.50%  
Tier 1 risk based capital to be well capitalized percentage 8.00% 8.00%  
Total risk based capital to be well capitalized percentage 10.00% 10.00%  
On January 1, 2016      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Required minimum conservation buffer percentage   0.625%  
On January 1, 2017      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Required minimum conservation buffer percentage   1.25%  
On January 1, 2018      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Required minimum conservation buffer percentage   1.875%  
Minimum capital ratios including conservation buffer, January 1, 2019      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Minimum common equity Tier 1 risk-based capital ratio   7.00%  
Tier 1 risk based capital minimum capital requirement percentage   8.50%  
Total risk based capital minimum capital requirement percentage   10.50%  
Required minimum conservation buffer percentage   2.50%  
Astoria Bank      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Minimum common equity Tier 1 risk-based capital ratio 4.50%    
Tier 1 risk based capital minimum capital requirement percentage 6.00%   4.00%
Total risk based capital minimum capital requirement percentage 8.00%   8.00%
Tier 1 leverage capital minimum capital requirement percentage 4.00%   4.00%
Tier 1 leverage capital to be well capitalized percentage 5.00%   5.00%
Common equity Tier 1 risk based capital to be well capitalized percentage 6.50%    
Tier 1 risk based capital to be well capitalized percentage 8.00%   6.00%
Total risk based capital to be well capitalized percentage 10.00%   10.00%