Loans - (Loan Portfolio Composition Including Carrying Value by Segment of Loans Accounted for under ASC Topic 310-30) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Loans [Line Items]
Total Loans	$ 2,860,921	$ 2,587,673
% of Total	100.00%	100.00%
Commercial Loan [Member]
Loans [Line Items]
Total Loans	$ 1,560,430	$ 1,427,420
% of Total	54.60%	55.20%
Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	$ 526,792	$ 442,885
% of Total	18.40%	17.10%
Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	$ 744,885	$ 684,002
% of Total	26.00%	26.40%
Consumer [Member]
Loans [Line Items]
Total Loans	$ 28,814	$ 33,366
% of Total	1.00%	1.30%
ASC 310-30 [Member]
Loans [Line Items]
Total Loans	$ 145,852	$ 202,830
ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	39,280	57,474
ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	89,150	121,173
ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	16,524	21,452
ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	898	2,731
Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	2,715,069	2,384,843
Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	1,521,150	1,369,946
Non ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	437,642	321,712
Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	728,361	662,550
Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	$ 27,916	$ 30,635