Fair Value of Financial Instruments (Fair Value by Balance Sheet Grouping) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and due from banks $ 23,072 $ 82,273
Interest bearing deposits in banks 2,319 1,479
Investment securities - AFS 142,303 146,470
Investment securities - HTM 89,242 95,346
Restricted bank stock 4,332 5,204
Loans, net 926,550 883,936 [1]
Financial derivatives 1,536 781
Accrued interest receivable 3,761 3,814
Deposits - non-maturity 818,958 805,263
Deposits - time deposits 223,123 235,489
Short-term borrowed funds 47,929 48,845
Long-term borrowed funds 102,313 123,906
Accrued interest payable 323 453
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 23,072 82,273
Interest bearing deposits in banks 2,319 1,479
Investment securities - AFS 142,303 146,470
Investment securities - HTM 90,295 93,632
Restricted bank stock 4,332 5,204
Loans, net 931,432 882,546 [1]
Financial derivatives 1,536 781
Accrued interest receivable 3,761 3,814
Deposits - non-maturity 818,958 805,263
Deposits - time deposits 222,162 234,127
Short-term borrowed funds 47,929 48,845
Long-term borrowed funds 100,929 120,929
Accrued interest payable 323 453
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 23,072 82,273
Interest bearing deposits in banks 2,319 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 126,156 131,550
Investment securities - HTM 79,976 86,836
Restricted bank stock 4,332 5,204
Financial derivatives 1,536 781
Accrued interest receivable 3,761 3,814
Deposits - non-maturity 818,958 805,263
Deposits - time deposits 223,123 235,489
Short-term borrowed funds 47,929 48,845
Long-term borrowed funds 102,313 123,906
Accrued interest payable 323 453
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investment securities - AFS 16,147 14,920
Investment securities - HTM 9,266 8,510
Loans, net $ 926,550 $ 883,936 [1]
[1] In accordance with the prospective adoption of Accounting Standards Update ("ASU") 2016-01, the fair value of loans at June 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.