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Commitments and Off-balance Sheet Items (Summary of Commitments and Contingencies) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Commitment to Sell Loans, Mandatory |  |
Commitments and Contingent Liabilities [Line Items] |  |
Fixed Rate | $ 254 | $ 681
Variable Rate | 0 | 0
Commitment to Sell Loans, Non-Mandatory |  |
Commitments and Contingent Liabilities [Line Items] |  |
Fixed Rate | 24,095 | 24,628
Variable Rate | 1,718 | 188
Standby Letters of Credit |  |
Commitments and Contingent Liabilities [Line Items] |  |
Fixed Rate | 3,284 | 959
Variable Rate | 5,863 | 4,736
Commitments to Fund Loans: |  |
Commitments and Contingent Liabilities [Line Items] |  |
Fixed Rate | 46,734 | 47,519
Variable Rate | 672,897 | 569,970
Consumer Lines | Commitments to Fund Loans: |  |
Commitments and Contingent Liabilities [Line Items] |  |
Fixed Rate | 11,356 | 10,997
Variable Rate | 343,666 | 260,934
Residential Mortgages | Commitments to Fund Loans: |  |
Commitments and Contingent Liabilities [Line Items] |  |
Fixed Rate | 16,640 | 17,255
Variable Rate | 3,559 | 655
Commercial Operating Lines | Commitments to Fund Loans: |  |
Commitments and Contingent Liabilities [Line Items] |  |
Fixed Rate | 18,738 | 19,267
Variable Rate | $ 325,672 | $ 308,381

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