Securities (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized cost, available for sale, total	$ 54,528	$ 35,493
Estimated fair value, available for sale, total	52,996	35,077
Amortized cost, held to maturity, total	109,247	109,420
Estimated fair value, held to maturity, total	108,034	109,309
Asset-backed securities issued by GSEs [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized cost, available for sale, within one year	7,879	6,075
Amortized cost, available for sale, over one year through five years	21,481	15,355
Amortized cost, available for sale, over five years through ten years	13,093	7,727
Amortized cost, available for sale, after ten years	7,689	2,047
Amortized cost, available for sale, total	50,142	31,204
Estimated fair value, available for sale, within one year	7,634	5,975
Estimated fair value, available for sale, over one year through five years	20,813	15,102
Estimated fair value, available for sale, over five years through ten years	12,686	7,600
Estimated fair value, available for sale, after ten years	7,450	2,013
Estimated fair value, available for sale, total	48,583	30,690
Amortized cost, held to maturity, within one year	18,844	21,850
Amortized cost, held to maturity, over one year through five years	47,168	50,895
Amortized cost, held to maturity, over five years through ten years	29,803	23,259
Amortized cost, held to maturity, after ten years	12,582	12,666
Amortized cost, held to maturity, total	108,397	108,670
Estimated fair value, held to maturity, within one year	21,104	21,828
Estimated fair value, held to maturity, over one year through five years	45,339	50,843
Estimated fair value, held to maturity, over five years through ten years	28,647	23,235
Estimated fair value, held to maturity, after ten years	12,094	12,653
Estimated fair value, held to maturity, total	107,184	108,559
Bond Mutual Funds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized cost, available for sale, within one year	4,386	4,289
Estimated fair value, available for sale, within one year	4,413	4,387
Amortized cost, held to maturity, within one year
Estimated fair value, held to maturity, within one year
US Government Obligations [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Amortized cost, available for sale, within one year
Estimated fair value, available for sale, within one year
Amortized cost, held to maturity, within one year	850	750
Estimated fair value, held to maturity, within one year	$ 850	$ 750