Investment Securities (Aggregate Unrealized Losses and Aggregate Fair Value of Underlying Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	$ 41,023	$ 22,535
Held-to-maturity Securities, Unrealized Losses	(1,886)	(444)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	23,190	8,248
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(426)	(82)
Held-to-maturity Securities, Fair Value Impaired More Than 12 Months	17,833	14,287
Held-to-maturity Securities, Unrealized Loss More Than 12 Months	(1,460)	(362)
Available-for-sale Securities, Fair Value, Total	99,161	109,722
Available-for-sale Securities, Unrealized Loss, Total	(3,184)	(1,784)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	15,868	46,941
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(297)	(419)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	83,293	62,781
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(2,887)	(1,365)
US Government Agency Obligations [Member]
Securities [Line Items]
Available-for-sale Securities, Fair Value, Total	49,455	52,893
Available-for-sale Securities, Unrealized Loss, Total	(622)	(386)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	8,839	30,894
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(138)	(185)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	40,616	21,999
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(484)	(201)
Government Sponsored Entities (GSE) Mortgage-Backed Securities [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	409
Held-to-maturity Securities, Unrealized Losses	(4)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	409
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(4)
Available-for-sale Securities, Fair Value, Total	27,331	32,488
Available-for-sale Securities, Unrealized Loss, Total	(1,431)	(715)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	2,500	9,055
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(91)	(133)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	24,831	23,433
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(1,340)	(582)
Collateralized Mortgage Obligations GSE [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	1,156	1,442
Held-to-maturity Securities, Unrealized Losses	(55)	(29)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months		620
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months		(5)
Held-to-maturity Securities, Fair Value Impaired More Than 12 Months	1,156	822
Held-to-maturity Securities, Unrealized Loss More Than 12 Months	(55)	(24)
Available-for-sale Securities, Fair Value, Total	9,941	11,654
Available-for-sale Securities, Unrealized Loss, Total	(669)	(447)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months		2,132
Available-for-sale Securities, Unrealized Loss Less Than 12 Months		(56)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	9,941	9,522
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(669)	(391)
Corporate Bonds [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	5,137	498
Held-to-maturity Securities, Unrealized Losses	(95)	(2)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	5,137	498
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(95)	(2)
Available-for-sale Securities, Fair Value, Total	10,638	10,759
Available-for-sale Securities, Unrealized Loss, Total	(275)	(173)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	4,529	4,572
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(68)	(43)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	6,109	6,187
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(207)	(130)
State and Municipal Taxable [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	352	355
Held-to-maturity Securities, Unrealized Losses	(10)	(8)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months		355
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months		(8)
Held-to-maturity Securities, Fair Value Impaired More Than 12 Months	352
Held-to-maturity Securities, Unrealized Loss More Than 12 Months	(10)
State and Municipal Tax-Exempt [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	33,969	20,240
Held-to-maturity Securities, Unrealized Losses	(1,722)	(405)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	17,644	6,775
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(327)	(67)
Held-to-maturity Securities, Fair Value Impaired More Than 12 Months	16,325	13,465
Held-to-maturity Securities, Unrealized Loss More Than 12 Months	(1,395)	(338)
Available-for-sale Securities, Fair Value, Total	1,796	1,928
Available-for-sale Securities, Unrealized Loss, Total	(187)	(63)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months		288
Available-for-sale Securities, Unrealized Loss Less Than 12 Months		(2)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	1,796	1,640
Available-for-sale Securities, Unrealized Loss More Than 12 Months	$ (187)	$ (61)