Investment Securities (Schedule of Fair Value and Unrealized Loss on Investments in a Continuous Unrealized Loss Position) (Details) $ in Thousands	Jun. 30, 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	33	18
Available-for-sale securities, Less than 12 Months: Fair Value	$ 36,021	$ 16,419
Available-for-sale securities, Less than 12 Months: Unrealized Losses	$ 994	$ 361
Available-for-sale securities, 12 Months or More: Number of Securities | security	75	74
Available-for-sale securities, 12 Months or More: Fair Value	$ 71,289	$ 73,816
Available-for-sale securities, 12 Months or More: Unrealized Losses	$ 4,531	$ 2,386
Available-for-sale securities, Total: Number of Securities | security	108	92
Available-for-sale securities, Total: Fair Value	$ 107,310	$ 90,235
Available-for-sale securities, Total: Unrealized Losses	$ 5,525	$ 2,747
Held-to-maturity securities, Less than 12 Months: Number of Securities | security	174	0
Held-to-maturity securities, Less than 12 Months: Fair Value	$ 116,431
Held-to-maturity securities, Less than 12 Months: Unrealized Losses	$ 2,976
Held-to-maturity securities, 12 Months or More: Number of Securities | security	11	116
Held-to-maturity securities, 12 Months or More: Fair Value	$ 12,302	$ 93,819
Held-to-maturity securities, 12 Months or More: Unrealized Losses	$ 390	$ 914
Held-to-maturity securities, Total: Number of Securities | security	185	116
Held-to-maturity securities, Total: Fair Value	$ 128,733	$ 93,819
Held-to-maturity securities, Total: Unrealized Losses	$ 3,366	$ 914
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Number of Securities | security	207	18
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Fair Value	$ 152,452	$ 16,419
Available-for-sale securities and Held-to-maturity securities, Less than 12 Months: Unrealized Losses	$ 3,970	$ 361
Available-for-sale securities and Held-to-maturity securities,, 12 Months or More: Number of Securities | security	86	190
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Fair Value	$ 83,591	$ 167,635
Available-for-sale securities and Held-to-maturity securities, 12 Months or More: Unrealized Losses	$ 4,921	$ 3,300
Available-for-sale securities and Held-to-maturity securities, Total: Number of Securities | security	293	208
Available-for-sale securities and Held-to-maturity securities, Total: Fair Value	$ 236,043	$ 184,054
Available-for-sale securities and Held-to-maturity securities, Total: Unrealized Losses	$ 8,891	$ 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	$ 4,453	$ 5,008
Available-for-sale securities, Less than 12 Months: Unrealized Losses	$ 231	$ 184
Available-for-sale securities, 12 Months or More: Number of Securities | security	19	18
Available-for-sale securities, 12 Months or More: Fair Value	$ 33,887	$ 33,722
Available-for-sale securities, 12 Months or More: Unrealized Losses	$ 2,026	$ 1,211
Available-for-sale securities, Total: Number of Securities | security	22	21
Available-for-sale securities, Total: Fair Value	$ 38,340	$ 38,730
Available-for-sale securities, Total: Unrealized Losses	$ 2,257	$ 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	$ 8,793
Held-to-maturity securities, Less than 12 Months: Unrealized Losses	$ 191
Held-to-maturity securities, 12 Months or More: Number of Securities | security	1	4
Held-to-maturity securities, 12 Months or More: Fair Value	$ 1,991	$ 10,894
Held-to-maturity securities, 12 Months or More: Unrealized Losses	$ 10	$ 90
Held-to-maturity securities, Total: Number of Securities | security	4	4
Held-to-maturity securities, Total: Fair Value	$ 10,784	$ 10,894
Held-to-maturity securities, Total: Unrealized Losses	$ 201	$ 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	15	4
Available-for-sale securities, Less than 12 Months: Fair Value	$ 23,474	$ 5,267
Available-for-sale securities, Less than 12 Months: Unrealized Losses	$ 407	$ 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	$ 18,916	$ 20,497
Available-for-sale securities, 12 Months or More: Unrealized Losses	$ 881	$ 494
Available-for-sale securities, Total: Number of Securities | security	30	19
Available-for-sale securities, Total: Fair Value	$ 42,390	$ 25,764
Available-for-sale securities, Total: Unrealized Losses	$ 1,288	$ 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	$ 54,276
Held-to-maturity securities, Less than 12 Months: Unrealized Losses	$ 1,324
Held-to-maturity securities, 12 Months or More: Number of Securities | security	7	35
Held-to-maturity securities, 12 Months or More: Fair Value	$ 8,825	$ 52,949
Held-to-maturity securities, 12 Months or More: Unrealized Losses	$ 325	$ 523
Held-to-maturity securities, Total: Number of Securities | security	44	35
Held-to-maturity securities, Total: Fair Value	$ 63,101	$ 52,949
Held-to-maturity securities, Total: Unrealized Losses	$ 1,649	$ 523
State and political subdivision obligations [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, Less than 12 Months: Number of Securities | security	15	11
Available-for-sale securities, Less than 12 Months: Fair Value	$ 8,094	$ 6,144
Available-for-sale securities, Less than 12 Months: Unrealized Losses	$ 356	$ 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	$ 18,486	$ 19,091
Available-for-sale securities, 12 Months or More: Unrealized Losses	$ 1,624	$ 637
Available-for-sale securities, Total: Number of Securities | security	56	51
Available-for-sale securities, Total: Fair Value	$ 26,580	$ 25,235
Available-for-sale securities, Total: Unrealized Losses	$ 1,980	$ 739
Held-to-maturity securities, Less than 12 Months: Number of Securities | security	134	0
Held-to-maturity securities, Less than 12 Months: Fair Value	$ 53,362
Held-to-maturity securities, Less than 12 Months: Unrealized Losses	$ 1,461
Held-to-maturity securities, 12 Months or More: Number of Securities | security	3	77
Held-to-maturity securities, 12 Months or More: Fair Value	$ 1,486	$ 29,976
Held-to-maturity securities, 12 Months or More: Unrealized Losses	$ 55	$ 301
Held-to-maturity securities, Total: Number of Securities | security	137	77
Held-to-maturity securities, Total: Fair Value	$ 54,848	$ 29,976
Held-to-maturity securities, Total: Unrealized Losses	$ 1,516	$ 301
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