Investment Securities (Aggregate Unrealized Losses and Aggregate Fair Value of Underlying Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	$ 22,535	$ 39,756
Held-to-maturity Securities, Unrealized Losses	(444)	(1,491)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	8,248	37,786
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(82)	(1,467)
Held-to-maturity Securities, Fair Value Impaired More Than 12 Months	14,287	1,970
Held-to-maturity Securities, Unrealized Loss More Than 12 Months	(362)	(24)
Available-for-sale Securities, Fair Value, Total	109,722	86,544
Available-for-sale Securities, Unrealized Loss, Total	(1,784)	(1,687)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	46,941	73,858
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(419)	(1,313)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	62,781	12,686
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(1,365)	(374)
US Government Agency Obligations [Member]
Securities [Line Items]
Available-for-sale Securities, Fair Value, Total	52,893	27,270
Available-for-sale Securities, Unrealized Loss, Total	(386)	(150)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	30,894	27,270
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(185)	(150)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	21,999
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(201)
Government Sponsored Entities (GSE) Mortgage-Backed Securities [Member]
Securities [Line Items]
Available-for-sale Securities, Fair Value, Total	32,488	29,145
Available-for-sale Securities, Unrealized Loss, Total	(715)	(723)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	9,055	29,145
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(133)	(723)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	23,433
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(582)
Collateralized Mortgage Obligations GSE [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	1,442	1,104
Held-to-maturity Securities, Unrealized Losses	(29)	(22)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	620	1,104
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(5)	(22)
Held-to-maturity Securities, Fair Value Impaired More Than 12 Months	822
Held-to-maturity Securities, Unrealized Loss More Than 12 Months	(24)
Available-for-sale Securities, Fair Value, Total	11,654	12,116
Available-for-sale Securities, Unrealized Loss, Total	(447)	(387)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	2,132	4,868
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(56)	(94)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	9,522	7,248
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(391)	(293)
Corporate Bonds [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	498	5,962
Held-to-maturity Securities, Unrealized Losses	(2)	(63)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	498	3,992
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(2)	(39)
Held-to-maturity Securities, Fair Value Impaired More Than 12 Months		1,970
Held-to-maturity Securities, Unrealized Loss More Than 12 Months		(24)
Available-for-sale Securities, Fair Value, Total	10,759	13,031
Available-for-sale Securities, Unrealized Loss, Total	(173)	(299)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	4,572	7,593
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(43)	(218)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	6,187	5,438
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(130)	(81)
State and Municipal Taxable [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	355
Held-to-maturity Securities, Unrealized Losses	(8)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	355
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(8)
State and Municipal Tax-Exempt [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	20,240	32,690
Held-to-maturity Securities, Unrealized Losses	(405)	(1,406)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	6,775	32,690
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(67)	(1,406)
Held-to-maturity Securities, Fair Value Impaired More Than 12 Months	13,465
Held-to-maturity Securities, Unrealized Loss More Than 12 Months	(338)
Available-for-sale Securities, Fair Value, Total	1,928	4,956
Available-for-sale Securities, Unrealized Loss, Total	(63)	(128)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	288	4,956
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(2)	(128)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	1,640
Available-for-sale Securities, Unrealized Loss More Than 12 Months	$ (61)
Asset-Backed Security [Member]
Securities [Line Items]
Available-for-sale Securities, Fair Value, Total		26
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months		$ 26