Nature of Operations	12 Months Ended
Dec. 31, 2019
Notes to Financial Statements
Basis of Accounting [Text Block]	1. Nature of Operations Flushing Financial Corporation (the “Holding Company”), a Delaware business corporation, is the bank holding company of its wholly-owned subsidiary Flushing Bank (the “Bank”). The Holding Company and its direct and indirect wholly-owned subsidiaries, including the Bank, Flushing Preferred Funding Corporation (“FPFC”), Flushing Service Corporation (“FSC”), and FSB Properties Inc. (“Properties”), are collectively herein referred to as the “Company.” The Company’s principal business is attracting retail deposits from the general public and investing those deposits together with funds generated from ongoing operations and borrowings, primarily in (1) originations and purchases of multi-family residential properties, commercial business loans, commercial real estate mortgage loans and, to a lesser extent, one-to-four family (focusing on mixed-use properties, which are properties that contain both residential dwelling units and commercial units); (2) construction loans, primarily for residential properties; (3) Small Business Administration (“SBA”) loans and other small business loans; (4) mortgage loan surrogates such as mortgage-backed securities; and (5) U.S. government securities, corporate fixed-income securities and other marketable securities. The Bank also originates certain other consumer loans including overdraft lines of credit. The Bank primarily conducts its business through twenty full-service banking offices, eight of which are located in Queens County, four in Nassau County, five in Kings County (Brooklyn), and three in New York County (Manhattan), New York. The Bank also operates an internet branch, which operates under the brands of iGObanking.com® and BankPurely® (the “Internet Branch”), offering checking, savings, money market and certificates of deposit accounts.

Nature of Operations

12 Months Ended

Dec. 31, 2019

1. Nature of Operations

Flushing Financial Corporation (the “Holding Company”), a Delaware business corporation, is the bank holding company of its wholly-owned subsidiary Flushing Bank (the “Bank”). The Holding Company and its direct and indirect wholly-owned subsidiaries, including the Bank, Flushing Preferred Funding Corporation (“FPFC”), Flushing Service Corporation (“FSC”), and FSB Properties Inc. (“Properties”), are collectively herein referred to as the “Company.”

The Company’s principal business is attracting retail deposits from the general public and investing those deposits together with funds generated from ongoing operations and borrowings, primarily in (1) originations and purchases of multi-family residential properties, commercial business loans, commercial real estate mortgage loans and, to a lesser extent, one-to-four family (focusing on mixed-use properties, which are properties that contain both residential dwelling units and commercial units); (2) construction loans, primarily for residential properties; (3) Small Business Administration (“SBA”) loans and other small business loans; (4) mortgage loan surrogates such as mortgage-backed securities; and (5) U.S. government securities, corporate fixed-income securities and other marketable securities. The Bank also originates certain other consumer loans including overdraft lines of credit. The Bank primarily conducts its business through twenty full-service banking offices, eight of which are located in Queens County, four in Nassau County, five in Kings County (Brooklyn), and three in New York County (Manhattan), New York. The Bank also operates an internet branch, which operates under the brands of iGObanking.com® and BankPurely® (the “Internet Branch”), offering checking, savings, money market and certificates of deposit accounts.