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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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