Investment Securities (Schedule of amortized cost, gross unrealized gains and losses and fair values of available for sale securities) (Details) - USD ($) $ in Thousands		Sep. 30, 2019		Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		$ 115,246		$ 104,573
Gross Unrealized Gains		937		12
Gross Unrealized Losses		(478)		(3,273)
Fair Value		115,705		101,312
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost				3,036
Gross Unrealized Losses				(65)
Fair Value				2,971
U.S. government agency mortgage-backed securities-residential
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		92,951		82,965
Gross Unrealized Gains		754		8
Gross Unrealized Losses		(407)		(2,757)
Fair Value		93,298		80,216
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		19,366		16,919
Gross Unrealized Gains		91
Gross Unrealized Losses		(71)		(451)
Fair Value		19,386		16,468
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		888	[1]	1,228
Gross Unrealized Gains		20	[1]	4
Gross Unrealized Losses	[1]	0
Fair Value		908	[1]	1,232
Corporate Bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		1,500
Gross Unrealized Gains		15
Gross Unrealized Losses		0
Fair Value		1,515
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		541		425
Gross Unrealized Gains		57
Gross Unrealized Losses		0
Fair Value		$ 598		$ 425

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