Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2016

Regulatory Capital Requirements [Abstract]

Schedule of Information Regarding Regulatory Capital Requirements

The following table sets forth information regarding the regulatory capital requirements applicable to Astoria Financial Corporation and Astoria Bank.

	At December 31, 2016
	Actual				Minimum Capital Requirements					Minimum Capital Requirements with Conservation Buffer					To be Well Capitalized Under Prompt Corrective Action Provisions
(Dollars in Thousands)	Amount		Ratio			Amount		Ratio			Amount		Ratio			Amount		Ratio
Astoria Financial Corporation:
Tier 1 leverage	$	1,572,750	10.85	%		$	579,829	4.00	%		N/A		N/A			$	724,786	5.00	%
Common equity tier 1 risk-based	1,448,341		17.29			376,857		4.50			$	429,199	5.125	%		544,350		6.50
Tier 1 risk-based	1,572,750		18.78			502,477		6.00			554,818		6.625			669,969		8.00
Total risk-based	1,659,221		19.81			669,969		8.00			722,310		8.625			837,461		10.00
Astoria Bank:
Tier 1 leverage	$	1,742,580	12.09	%		$	576,660	4.00	%		N/A		N/A			$	720,825	5.00	%
Common equity tier 1 risk-based	1,742,580		20.85			376,129		4.50			$	428,369	5.125	%		543,297		6.50
Tier 1 risk-based	1,742,580		20.85			501,505		6.00			553,745		6.625			668,673		8.00
Total risk-based	1,829,051		21.88			668,673		8.00			720,913		8.625			835,841		10.00

	At December 31, 2015
	Actual				Minimum Capital Requirements					Minimum Capital Requirements with Conservation Buffer			To be Well Capitalized Under Prompt Corrective Action Provisions
(Dollars in Thousands)	Amount		Ratio			Amount		Ratio			Amount	Ratio		Amount		Ratio
Astoria Financial Corporation:
Tier 1 leverage	$	1,521,367	10.21	%		$	596,022	4.00	%		N/A	N/A		$	745,027	5.00	%
Common equity tier 1 risk-based	1,401,376		16.00			394,092		4.50			N/A	N/A		569,244		6.50
Tier 1 risk-based	1,521,367		17.37			525,456		6.00			N/A	N/A		700,608		8.00
Total risk-based	1,620,612		18.51			700,608		8.00			N/A	N/A		875,760		10.00
Astoria Bank:
Tier 1 leverage	$	1,670,312	11.29	%		$	591,787	4.00	%		N/A	N/A		$	739,734	5.00	%
Common equity tier 1 risk-based	1,670,312		19.12			393,153		4.50			N/A	N/A		567,888		6.50
Tier 1 risk-based	1,670,312		19.12			524,204		6.00			N/A	N/A		698,939		8.00
Total risk-based	1,769,557		20.25			698,939		8.00			N/A	N/A		873,674		10.00