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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 | Mar. 31, 2018 USD ($) securities loans | Dec. 31, 2017 USD ($) securities loans
--- | --- | ---
Troubled debt restructurings |  |
Number of Loans | loans | 24 | 27
Recorded Investment | $ 8,891 | $ 9,147
Commercial and industrial |  |
Troubled debt restructurings |  |
Number of Loans | loans | 10 | 10
Recorded Investment | $ 4,913 | $ 4,951
Extension of term | Commercial real estate: |  |
Troubled debt restructurings |  |
Number of Loans | loans | 0 | 0
Recorded Investment | $ 0 | $ 0
Extension of term | Consumer and other: |  |
Troubled debt restructurings |  |
Number of Loans | loans | 1 | 1
Recorded Investment | $ 316 | $ 328
Interest rate concession | Commercial real estate: |  |
Troubled debt restructurings |  |
Number of Loans | securities | 12 | 12
Recorded Investment | $ 3,660 | $ 3,793
Combination of extension of term and interest rate concession | Commercial real estate: |  |
Troubled debt restructurings |  |
Number of Loans | loans | 0 | 1
Recorded Investment | $ 0 | $ 54
Combination of extension of term and interest rate concession | Commercial and industrial |  |
Troubled debt restructurings |  |
Number of Loans | loans | 10 | 10
Recorded Investment | $ 4,913 | $ 4,951
Combination of extension of term and interest rate concession | Consumer and other: |  |
Troubled debt restructurings |  |
Number of Loans | loans | 1 | 3
Recorded Investment | $ 2 | $ 21

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