Investment Securities (Aggregate Unrealized Losses and Aggregate Fair Value of Underlying Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	$ 24,685	$ 39,756
Held-to-maturity Securities, Unrealized Losses	(520)	(1,491)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	9,612	37,786
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(76)	(1,467)
Held-to-maturity Securities, Fair Value Impaired More Than 12 Months	15,073	1,970
Held-to-maturity Securities, Unrealized Loss More Than 12 Months	(444)	(24)
Available-for-sale Securities, Fair Value, Total	106,999	86,544
Available-for-sale Securities, Unrealized Loss, Total	(1,263)	(1,687)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	52,755	73,858
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(336)	(1,313)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	54,244	12,686
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(927)	(374)
US Government Agency Obligations [Member]
Securities [Line Items]
Available-for-sale Securities, Fair Value, Total	53,102	27,270
Available-for-sale Securities, Unrealized Loss, Total	(209)	(150)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	33,017	27,270
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(94)	(150)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	20,085
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(115)
Government Sponsored Entities (GSE) Mortgage-Backed Securities [Member]
Securities [Line Items]
Available-for-sale Securities, Fair Value, Total	29,772	29,145
Available-for-sale Securities, Unrealized Loss, Total	(498)	(723)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	12,055	29,145
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(166)	(723)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	17,717
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(332)
Collateralized Mortgage Obligations GSE [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	895	1,104
Held-to-maturity Securities, Unrealized Losses	(15)	(22)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months		1,104
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months		(22)
Held-to-maturity Securities, Fair Value Impaired More Than 12 Months	895
Held-to-maturity Securities, Unrealized Loss More Than 12 Months	(15)
Available-for-sale Securities, Fair Value, Total	12,308	12,116
Available-for-sale Securities, Unrealized Loss, Total	(370)	(387)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	3,730	4,868
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(58)	(94)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	8,578	7,248
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(312)	(293)
Corporate Bonds [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	2,492	5,962
Held-to-maturity Securities, Unrealized Losses	(4)	(63)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	2,492	3,992
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(4)	(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	9,895	13,031
Available-for-sale Securities, Unrealized Loss, Total	(114)	(299)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	3,660	7,593
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(17)	(218)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	6,235	5,438
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(97)	(81)
State and Municipal Taxable [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	989
Held-to-maturity Securities, Unrealized Losses	(18)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	989
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(18)
State and Municipal Tax-Exempt [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	20,309	32,690
Held-to-maturity Securities, Unrealized Losses	(483)	(1,406)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	6,131	32,690
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(54)	(1,406)
Held-to-maturity Securities, Fair Value Impaired More Than 12 Months	14,178
Held-to-maturity Securities, Unrealized Loss More Than 12 Months	(429)
Available-for-sale Securities, Fair Value, Total	1,922	4,956
Available-for-sale Securities, Unrealized Loss, Total	(72)	(128)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	293	4,956
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(1)	(128)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	1,629
Available-for-sale Securities, Unrealized Loss More Than 12 Months	$ (71)
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