Investment Securities (Aggregate Unrealized Losses and Aggregate Fair Value of Underlying Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	$ 32,641	$ 22,535
Held-to-maturity Securities, Unrealized Losses	(1,532)	(444)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	18,645	8,248
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(440)	(82)
Held-to-maturity Securities, Fair Value Impaired More Than 12 Months	13,996	14,287
Held-to-maturity Securities, Unrealized Loss More Than 12 Months	(1,092)	(362)
Available-for-sale Securities, Fair Value, Total	103,429	109,722
Available-for-sale Securities, Unrealized Loss, Total	(3,021)	(1,784)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	26,428	46,941
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(564)	(419)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	77,001	62,781
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(2,457)	(1,365)
US Government Agency Obligations [Member]
Securities [Line Items]
Available-for-sale Securities, Fair Value, Total	49,449	52,893
Available-for-sale Securities, Unrealized Loss, Total	(621)	(386)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	15,625	30,894
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(297)	(185)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	33,824	21,999
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(324)	(201)
Government Sponsored Entities (GSE) Mortgage-Backed Securities [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	442
Held-to-maturity Securities, Unrealized Losses	(1)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	442
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(1)
Available-for-sale Securities, Fair Value, Total	28,980	32,488
Available-for-sale Securities, Unrealized Loss, Total	(1,348)	(715)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	3,798	9,055
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(131)	(133)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	25,182	23,433
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(1,217)	(582)
Collateralized Mortgage Obligations GSE [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	1,241	1,442
Held-to-maturity Securities, Unrealized Losses	(51)	(29)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	531	620
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(16)	(5)
Held-to-maturity Securities, Fair Value Impaired More Than 12 Months	710	822
Held-to-maturity Securities, Unrealized Loss More Than 12 Months	(35)	(24)
Available-for-sale Securities, Fair Value, Total	10,522	11,654
Available-for-sale Securities, Unrealized Loss, Total	(608)	(447)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	201	2,132
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(7)	(56)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	10,321	9,522
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(601)	(391)
Corporate Bonds [Member]
Securities [Line Items]
Held-to-maturity Securities, Fair Value, Total	4,192	498
Held-to-maturity Securities, Unrealized Losses	(72)	(2)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	4,192	498
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(72)	(2)
Available-for-sale Securities, Fair Value, Total	12,661	10,759
Available-for-sale Securities, Unrealized Loss, Total	(275)	(173)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	6,520	4,572
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(128)	(43)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	6,141	6,187
Available-for-sale Securities, Unrealized Loss More Than 12 Months	(147)	(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	26,416	20,240
Held-to-maturity Securities, Unrealized Losses	(1,396)	(405)
Held-to-maturity Securities, Fair Value Impaired Less Than 12 Months	13,130	6,775
Held-to-maturity Securities, Unrealized Loss Less Than 12 Months	(339)	(67)
Held-to-maturity Securities, Fair Value Impaired More Than 12 Months	13,286	13,465
Held-to-maturity Securities, Unrealized Loss More Than 12 Months	(1,057)	(338)
Available-for-sale Securities, Fair Value, Total	1,817	1,928
Available-for-sale Securities, Unrealized Loss, Total	(169)	(63)
Available-for-sale Securities, Fair Value Impaired Less Than 12 Months	284	288
Available-for-sale Securities, Unrealized Loss Less Than 12 Months	(1)	(2)
Available-for-sale Securities, Fair Value Impaired More Than 12 Months	1,533	1,640
Available-for-sale Securities, Unrealized Loss More Than 12 Months	$ (168)	$ (61)