TDR's that have subsequent default (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) contract	Dec. 31, 2015 USD ($) contract	Dec. 31, 2014 USD ($) contract
TROUBLED DEBT RESTRUCTURINGS THAT SUBSEQUENTLY DEFAULTED:
Recorded Investment | $	$ 249	$ 1,267	$ 410
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract	1	7	5
Commercial And Industrial [Member]
TROUBLED DEBT RESTRUCTURINGS THAT SUBSEQUENTLY DEFAULTED:
Recorded Investment | $	$ 0	$ 339	$ 196
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract	0	3	2
Commercial Real Estate [Member]
TROUBLED DEBT RESTRUCTURINGS THAT SUBSEQUENTLY DEFAULTED:
Recorded Investment | $	$ 249	$ 502	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract	1	1	0
Residential Real Estate [Member]
TROUBLED DEBT RESTRUCTURINGS THAT SUBSEQUENTLY DEFAULTED:
Recorded Investment | $	$ 0	$ 326	$ 214
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract	0	2	3
Home Equity Line of Credit [Member]
TROUBLED DEBT RESTRUCTURINGS THAT SUBSEQUENTLY DEFAULTED:
Recorded Investment | $	$ 0	$ 100	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract	0	1	0