Available for Sale Securities (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		$ 107,759	$ 116,242
Gross Unrealized Gains		1	2
Gross Unrealized Losses		(5,373)	(2,942)
Fair Value		102,387	113,302
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		3,039	3,048
Gross Unrealized Gains		0	0
Gross Unrealized Losses		(111)	(47)
Fair Value		2,928	3,001
U.S. government agency mortgage-backed securities-residential
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		86,568	93,858
Gross Unrealized Gains		0	1
Gross Unrealized Losses		(4,555)	(2,470)
Fair Value		82,013	91,389
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		16,923	16,935
Gross Unrealized Gains		0	0
Gross Unrealized Losses		(706)	(409)
Fair Value		16,217	16,526
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	[1]	1,229	2,401
Gross Unrealized Gains	[1]	1	1
Gross Unrealized Losses	[1]	(1)	(16)
Fair Value	[1]	$ 1,229	$ 2,386

[1] The issuers of municipal securities are all within New York State.