Investment Securities (Aggregate Unrealized Losses and Aggregate Fair Value of Underlying Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	$ 34,992	$ 22,535
Held-to-maturity Securities, Unrealized Losses	(1,487)	(444)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	21,436	8,248
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(452)	(82)
Held-to-maturity Securities, Fair Value Impaired More Than 12 Months	13,556	14,287
Held-to-maturity Securities, Unrealized Loss More Than 12 Months	(1,035)	(362)
Available-for-sale Securities, Fair Value, Total	107,831	109,722
Available-for-sale Securities, Unrealized Loss, Total	(2,797)	(1,784)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	33,902	46,941
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(778)	(419)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	73,929	62,781
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(2,019)	(1,365)
US Government Agency Obligations [Member]
Securities [Line Items]
Available-for-sale Securities, Fair Value, Total	52,663	52,893
Available-for-sale Securities, Unrealized Loss, Total	(622)	(386)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	17,534	30,894
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(331)	(185)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	35,129	21,999
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(291)	(201)
Government Sponsored Entities (GSE) Mortgage-Backed Securities [Member]
Securities [Line Items]
Available-for-sale Securities, Fair Value, Total	30,587	32,488
Available-for-sale Securities, Unrealized Loss, Total	(1,204)	(715)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	8,518	9,055
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(262)	(133)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	22,069	23,433
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(942)	(582)
Collateralized Mortgage Obligations GSE [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	1,327	1,442
Held-to-maturity Securities, Unrealized Losses	(45)	(29)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	568	620
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(13)	(5)
Held-to-maturity Securities, Fair Value Impaired More Than 12 Months	759	822
Held-to-maturity Securities, Unrealized Loss More Than 12 Months	(32)	(24)
Available-for-sale Securities, Fair Value, Total	11,103	11,654
Available-for-sale Securities, Unrealized Loss, Total	(550)	(447)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	2,065	2,132
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(74)	(56)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	9,038	9,522
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(476)	(391)
Corporate Bonds [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	5,257	498
Held-to-maturity Securities, Unrealized Losses	(37)	(2)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	5,257	498
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(37)	(2)
Available-for-sale Securities, Fair Value, Total	11,653	10,759
Available-for-sale Securities, Unrealized Loss, Total	(258)	(173)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	5,500	4,572
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(109)	(43)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	6,153	6,187
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(149)	(130)
State and Municipal Taxable [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	350	355
Held-to-maturity Securities, Unrealized Losses	(12)	(8)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	350	355
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(12)	(8)
State and Municipal Tax-Exempt [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	28,058	20,240
Held-to-maturity Securities, Unrealized Losses	(1,393)	(405)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	15,261	6,775
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(390)	(67)
Held-to-maturity Securities, Fair Value Impaired More Than 12 Months	12,797	13,465
Held-to-maturity Securities, Unrealized Loss More Than 12 Months	(1,003)	(338)
Available-for-sale Securities, Fair Value, Total	1,825	1,928
Available-for-sale Securities, Unrealized Loss, Total	(163)	(63)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	285	288
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(2)	(2)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	1,540	1,640
Available-for-sale Securities, Unrealized Loss More Than 12 Months	$ (161)	$ (61)