Consolidated Statement of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Consolidated Statements of Financial Condition [Abstract]
Held-to-maturity securities, fair value	$ 91,896	$ 95,346
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	25,000,000	25,000,000
Common Stock, Shares, Issued	7,084,000	7,067,000
Common Stock, Shares, Outstanding	7,084,000	7,067,000