Loans and Allowance for Credit Losses (Details 4) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Nonaccrual loan, recorded investment	[1],[2]	$ 16,609	$ 17,875	$ 22,274
Commercial Portfolio Segment [Member]
Nonaccrual loan, recorded investment		3,242	2,490	2,986
Commercial Real Estate - Income Producing Portfolio Segment [Member]
Nonaccrual loan, recorded investment		880	10,539	10,098
Commercial Real Estate - Owner Occupied Portfolio Segment [Member]
Nonaccrual loan, recorded investment		6,570	2,093	2,103
Real Estate Mortgage - Residential Portfolio Segment [Member]
Nonaccrual loan, recorded investment		301	555	562
Construction Portfolio Segment [Member]
Nonaccrual loan, recorded investment		4,930	2,072	6,412
Home Equity Portfolio Segment [Member]
Nonaccrual loan, recorded investment		594		$ 113
Other Consumer Portfolio Segment [Member]
Nonaccrual loan, recorded investment		$ 92	$ 126

[1] Excludes troubled debt restructurings ("TDRs") that were performing under their restructured terms totaling $12.3 million at September 30, 2017, as compared to $7.9 million at December 31, 2016 and $2.9 million at September 30, 2016.

[2] Gross interest income of $176 thousand and $802 thousand would have been recorded for the three and nine months ended September 30, 2017, if nonaccrual loans shown above had been current and in accordance with their original terms while interest actually recorded on such loans was $31 thousand and $56 thousand for the three and nine months ended September 30, 2017. See Note 1 to the Consolidated Financial Statements for a description of the Company's policy for placing loans on nonaccrual status.