Loans (Summary of TDRs with a Payment Default During the Period) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) loan	Dec. 31, 2015 USD ($) loan	Dec. 31, 2014 USD ($) loan
Troubled debt restructurings on financing receivables with defaults payment
Number of loans (in loan) | loan	16	9	25
Principal balance at year end | $	$ 1,980	$ 2,287	$ 3,496
Commercial Loan Portfolio
Troubled debt restructurings on financing receivables with defaults payment
Number of loans (in loan) | loan	2	6	13
Principal balance at year end | $	$ 1,721	$ 2,222	$ 3,237
Consumer Loan Portfolio
Troubled debt restructurings on financing receivables with defaults payment
Number of loans (in loan) | loan	14	3	12
Principal balance at year end | $	$ 259	$ 65	$ 259
Commercial | Commercial Loan Portfolio
Troubled debt restructurings on financing receivables with defaults payment
Number of loans (in loan) | loan	0	1	7
Principal balance at year end | $	$ 0	$ 1,206	$ 885
Commercial real estate | Commercial Loan Portfolio
Troubled debt restructurings on financing receivables with defaults payment
Number of loans (in loan) | loan	2	5	6
Principal balance at year end | $	$ 1,721	$ 1,016	$ 2,352