Borrowed Funds (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Repurchase Agreements [Table Text Block]

	2020				2019
			Weighted				Weighted
			Average				Average
	Amount		Rate		Amount		Rate
	(Dollars in thousands)
FHLB-NY advances - fixed rate:
Due in 2020	$	—	—		$	727,516	1.86
Due in 2021		702,515	0.57			200,016	1.65
Due in 2022		55,685	0.52			175,000	1.93
Due in 2023		39,001	0.48			15,996	3.14
Total FHLB-NY advances		797,201	0.56			1,118,528	1.85
Other Borrowings:
Due in 2022		90,378	0.35			—	—
Subordinated debentures - fixed rate through 2021
Due in 2025		15,523	6.12			—	—
Due in 2026		74,657	5.27			74,319	5.30
Total Subordinated debentures		90,180	5.42			74,319	5.30
Junior subordinated debentures - adjustable rate Due in 2037		43,136	2.35			44,384	4.65
Total borrowings	$	1,020,895	1.05	%	$	1,237,231	2.16	%

Terms of Securities Issued By Trusts [Table Text Block]

		Subordinated		Subordinated		Subordinated
		Debentures		Debentures		Debentures
		(Dollars in thousands)
Amount	$	75,000	$	7,500	$	7,750
Issue Date		December 12, 2016		December 17, 2015		December 17, 2015
Initial Rate		5.25	%	7.38	%	6.50	%
First Reset Date		December 15, 2021		N/A		December 20, 2020
First Call Date		December 15, 2021		December 20, 2020		December 20, 2020
Holding Type		Variable		Fixed		Variable
Spread over 3-month LIBOR		3.44	%	N/A	%	4.88	%
Maturity Date		December 15, 2026		December 17, 2025		December 17, 2025

	Flushing Financial		Flushing Financial		Flushing Financial
	Capital Trust II		Capital Trust III		Capital Trust IV
Issue Date	June 20, 2007		June 21, 2007		July 3, 2007
Initial Rate	7.14	%	6.89	%	6.85	%
First Reset Date	September 01, 2012		June 15, 2012		July 30, 2012
Spread over 3-month LIBOR	1.41	%	1.44	%	1.42	%
Maturity Date	September 01, 2037		September 15, 2037		July 30, 2037