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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Troubled Debt Restructurings by Modification Type) (Details) $ in Thousands | Dec. 31, 2017 USD ($) securities loans | Dec. 31, 2016 USD ($) securities loans
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Troubled debt restructurings: |  |
Number of Loans | loans | 27 | 30
Recorded Investment | $ 9,147 | $ 13,560
Commercial and industrial |  |
Troubled debt restructurings: |  |
Number of Loans | loans | 10 | 10
Recorded Investment | $ 4,951 | $ 7,058
Extension of term | Commercial real estate: |  |
Troubled debt restructurings: |  |
Number of Loans | loans | 0 | 1
Recorded Investment | $ 0 | $ 8
Extension of term | Consumer and other: |  |
Troubled debt restructurings: |  |
Number of Loans | loans | 1 | 1
Recorded Investment | $ 328 | $ 378
Interest rate concession | Commercial real estate: |  |
Troubled debt restructurings: |  |
Number of Loans | securities | 12 | 1
Recorded Investment | $ 3,793 | $ 52
Combination of extension of term and interest rate conession | Commercial real estate: |  |
Troubled debt restructurings: |  |
Number of Loans | loans | 1 | 16
Recorded Investment | $ 54 | $ 6,056
Combination of extension of term and interest rate conession | Commercial and industrial |  |
Troubled debt restructurings: |  |
Number of Loans | loans | 10 | 10
Recorded Investment | $ 4,951 | $ 7,058
Combination of extension of term and interest rate conession | Consumer and other: |  |
Troubled debt restructurings: |  |
Number of Loans | loans | 3 | 1
Recorded Investment | $ 21 | $ 8

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