Fair Value of Financial Instruments (Fair Value by Balance Sheet Grouping) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	$ 21,725	$ 82,273
Interest bearing deposits in banks	1,832	1,479
Investment securities - AFS	138,645	146,470
Investment securities - HTM	91,896	95,346
Restricted bank stock	5,394	5,204
Loans, net	938,110	883,936	[1]
Financial derivatives	1,689	781
Accrued interest receivable	4,069	3,814
Deposits - non-maturity	801,017	805,263
Deposits - time deposits	224,295	235,489
Short-term borrowed funds	86,805	48,845
Long-term borrowed funds	97,622	123,906
Accrued interest payable	358	453
Off balance sheet financial instruments	0	0
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	21,725	82,273
Interest bearing deposits in banks	1,832	1,479
Investment securities - AFS	138,645	146,470
Investment securities - HTM	93,726	93,632
Restricted bank stock	5,394	5,204
Loans, net	953,737	882,546	[1]
Financial derivatives	1,689	781
Accrued interest receivable	4,069	3,814
Deposits - non-maturity	801,017	805,263
Deposits - time deposits	223,558	234,127
Short-term borrowed funds	86,805	48,845
Long-term borrowed funds	100,929	120,929
Accrued interest payable	358	453
Off balance sheet financial instruments	0	0
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	21,725	82,273
Interest bearing deposits in banks	1,832	1,479
Off balance sheet financial instruments	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities - AFS	122,077	131,550
Investment securities - HTM	81,444	86,836
Restricted bank stock	5,394	5,204
Financial derivatives	1,689	781
Accrued interest receivable	4,069	3,814
Deposits - non-maturity	801,017	805,263
Deposits - time deposits	224,295	235,489
Short-term borrowed funds	86,805	48,845
Long-term borrowed funds	97,622	123,906
Accrued interest payable	358	453
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities - AFS	16,568	14,920
Investment securities - HTM	10,452	8,510
Loans, net	$ 938,110	$ 883,936	[1]

[1] In accordance with the prospective adoption of Accounting Standards Update ("ASU") 2016-01, the fair value of loans at September 30, 2018 was measured using an exit price notion. The fair value of loans at December 31, 2017 was measured using an entry price notion.