Investment Securities (Schedule of Fair Value and Unrealized Loss on Investments in a Continuous Unrealized Loss Position) (Details) $ in Thousands	Mar. 31, 2018 USD ($) security	Dec. 31, 2017 USD ($) security
Schedule of Investments [Line Items]
Available-for-sale securities, Less than 12 Months: Number of Securities | security	30	18
Available-for-sale securities, Less than 12 Months: Fair Value	$ 33,101	$ 16,419
Available-for-sale securities, Less than 12 Months: Unrealized Losses	$ 863	$ 361
Available-for-sale securities, 12 Months or More: Number of Securities | security	74	74
Available-for-sale securities, 12 Months or More: Fair Value	$ 71,228	$ 73,816
Available-for-sale securities, 12 Months or More: Unrealized Losses	$ 4,237	$ 2,386
Available-for-sale securities, Total: Number of Securities | security	104	92
Available-for-sale securities, Total: Fair Value	$ 104,329	$ 90,235
Available-for-sale securities, Total: Unrealized Losses	$ 5,100	$ 2,747
Held-to-maturity securities, Less than 12 Months: Number of Securities | security	143	0
Held-to-maturity securities, Less than 12 Months: Fair Value	$ 105,724
Held-to-maturity securities, Less than 12 Months: Unrealized Losses	$ 2,937
Held-to-maturity securities, 12 Months or More: Number of Securities | security	3	116
Held-to-maturity securities, 12 Months or More: Fair Value	$ 4,053	$ 93,819
Held-to-maturity securities, 12 Months or More: Unrealized Losses	$ 59	$ 914
Held-to-maturity securities, Total: Number of Securities | security	146	116
Held-to-maturity securities, Total: Fair Value	$ 109,777	$ 93,819
Held-to-maturity securities, Total: Unrealized Losses	$ 2,996	$ 914
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Number of Securities | security	173	18
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Fair Value	$ 138,825	$ 16,419
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Unrealized Losses	$ 3,800	$ 361
Available-for-sale securities and Held-to-maturity securities,, 12 Months or More: Number of Securities | security	77	190
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Fair Value	$ 75,281	$ 167,635
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Unrealized Losses	$ 4,296	$ 3,300
Available-for-sale securities and Held-to-maturity securities, Total: Number of Securities | security	250	208
Available-for-sale securities and Held-to-maturity securities, Total: Fair Value	$ 214,106	$ 184,054
Available-for-sale securities and Held-to-maturity securities, Total: Unrealized Losses	$ 8,096	$ 3,661
U.S. Treasury and U.S. government agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, Less than 12 Months: Number of Securities | security	3	3
Available-for-sale securities, Less than 12 Months: Fair Value	$ 4,925	$ 5,008
Available-for-sale securities, Less than 12 Months: Unrealized Losses	$ 267	$ 184
Available-for-sale securities, 12 Months or More: Number of Securities | security	18	18
Available-for-sale securities, 12 Months or More: Fair Value	$ 33,110	$ 33,722
Available-for-sale securities, 12 Months or More: Unrealized Losses	$ 1,815	$ 1,211
Available-for-sale securities, Total: Number of Securities | security	21	21
Available-for-sale securities, Total: Fair Value	$ 38,035	$ 38,730
Available-for-sale securities, Total: Unrealized Losses	$ 2,082	$ 1,395
Held-to-maturity securities, Less than 12 Months: Number of Securities | security	3	0
Held-to-maturity securities, Less than 12 Months: Fair Value	$ 8,822
Held-to-maturity securities, Less than 12 Months: Unrealized Losses	$ 161
Held-to-maturity securities, 12 Months or More: Number of Securities | security	1	4
Held-to-maturity securities, 12 Months or More: Fair Value	$ 1,988	$ 10,894
Held-to-maturity securities, 12 Months or More: Unrealized Losses	$ 13	$ 90
Held-to-maturity securities, Total: Number of Securities | security	4	4
Held-to-maturity securities, Total: Fair Value	$ 10,810	$ 10,894
Held-to-maturity securities, Total: Unrealized Losses	$ 174	$ 90
Mortgage-backed U.S. Government Agencies [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, Less than 12 Months: Number of Securities | security	13	4
Available-for-sale securities, Less than 12 Months: Fair Value	$ 20,127	$ 5,267
Available-for-sale securities, Less than 12 Months: Unrealized Losses	$ 258	$ 75
Available-for-sale securities, 12 Months or More: Number of Securities | security	15	15
Available-for-sale securities, 12 Months or More: Fair Value	$ 19,597	$ 20,497
Available-for-sale securities, 12 Months or More: Unrealized Losses	$ 819	$ 494
Available-for-sale securities, Total: Number of Securities | security	28	19
Available-for-sale securities, Total: Fair Value	$ 39,724	$ 25,764
Available-for-sale securities, Total: Unrealized Losses	$ 1,077	$ 569
Held-to-maturity securities, Less than 12 Months: Number of Securities | security	37	0
Held-to-maturity securities, Less than 12 Months: Fair Value	$ 55,999
Held-to-maturity securities, Less than 12 Months: Unrealized Losses	$ 1,299
Held-to-maturity securities, 12 Months or More: Number of Securities | security	2	35
Held-to-maturity securities, 12 Months or More: Fair Value	$ 2,065	$ 52,949
Held-to-maturity securities, 12 Months or More: Unrealized Losses	$ 46	$ 523
Held-to-maturity securities, Total: Number of Securities | security	39	35
Held-to-maturity securities, Total: Fair Value	$ 58,064	$ 52,949
Held-to-maturity securities, Total: Unrealized Losses	$ 1,345	$ 523
State and political subdivision obligations [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, Less than 12 Months: Number of Securities | security	14	11
Available-for-sale securities, Less than 12 Months: Fair Value	$ 8,049	$ 6,144
Available-for-sale securities, Less than 12 Months: Unrealized Losses	$ 338	$ 102
Available-for-sale securities, 12 Months or More: Number of Securities | security	41	40
Available-for-sale securities, 12 Months or More: Fair Value	$ 18,521	$ 19,091
Available-for-sale securities, 12 Months or More: Unrealized Losses	$ 1,603	$ 637
Available-for-sale securities, Total: Number of Securities | security	55	51
Available-for-sale securities, Total: Fair Value	$ 26,570	$ 25,235
Available-for-sale securities, Total: Unrealized Losses	$ 1,941	$ 739
Held-to-maturity securities, Less than 12 Months: Number of Securities | security	103	0
Held-to-maturity securities, Less than 12 Months: Fair Value	$ 40,903
Held-to-maturity securities, Less than 12 Months: Unrealized Losses	$ 1,477
Held-to-maturity securities, 12 Months or More: Number of Securities | security	0	77
Held-to-maturity securities, 12 Months or More: Fair Value		$ 29,976
Held-to-maturity securities, 12 Months or More: Unrealized Losses		$ 301
Held-to-maturity securities, Total: Number of Securities | security	103	77
Held-to-maturity securities, Total: Fair Value	$ 40,903	$ 29,976
Held-to-maturity securities, Total: Unrealized Losses	$ 1,477	$ 301
Corporate debt securities [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, Less than 12 Months: Number of Securities | security		0
Available-for-sale securities, 12 Months or More: Number of Securities | security		0
Available-for-sale securities, Total: Number of Securities | security		0
Held-to-maturity securities, Less than 12 Months: Number of Securities | security		0
Held-to-maturity securities, 12 Months or More: Number of Securities | security		0
Held-to-maturity securities, Total: Number of Securities | security		0
Equity Securities [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, Less than 12 Months: Number of Securities | security		0
Available-for-sale securities, 12 Months or More: Number of Securities | security		1
Available-for-sale securities, 12 Months or More: Fair Value		$ 506
Available-for-sale securities, 12 Months or More: Unrealized Losses		$ 44
Available-for-sale securities, Total: Number of Securities | security		1
Available-for-sale securities, Total: Fair Value		$ 506
Available-for-sale securities, Total: Unrealized Losses		$ 44
Held-to-maturity securities, Less than 12 Months: Number of Securities | security		0
Held-to-maturity securities, 12 Months or More: Number of Securities | security		0
Held-to-maturity securities, Total: Number of Securities | security		0