Loans - (Loan Portfolio Composition Including Carrying Value by Segment of Loans Accounted for under ASC Topic 310-30) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Loans [Line Items]
Total Loans	$ 2,738,504	$ 2,587,673	$ 2,328,524
% of Total	100.00%	100.00%
Commercial Loan [Member]
Loans [Line Items]
Total Loans	$ 1,490,749	$ 1,427,420
% of Total	54.40%	55.20%
Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	$ 525,739	$ 442,885
% of Total	19.20%	17.10%
Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	$ 694,171	$ 684,002
% of Total	25.40%	26.40%
Consumer [Member]
Loans [Line Items]
Total Loans	$ 27,845	$ 33,366
% of Total	1.00%	1.30%
ASC 310-30 [Member]
Loans [Line Items]
Total Loans	$ 169,282	$ 202,830
ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	46,875	57,474
ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	101,719	121,173
ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	19,341	21,452
ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	1,347	2,731
Non ASC 310-30 [Member]
Loans [Line Items]
Total Loans	2,569,222	2,384,843
Non ASC 310-30 [Member] | Commercial Loan [Member]
Loans [Line Items]
Total Loans	1,443,874	1,369,946
Non ASC 310-30 [Member] | Commercial Real Estate [Member]
Loans [Line Items]
Total Loans	424,020	321,712
Non ASC 310-30 [Member] | Residential Real Estate Segment [Member]
Loans [Line Items]
Total Loans	674,830	662,550
Non ASC 310-30 [Member] | Consumer [Member]
Loans [Line Items]
Total Loans	$ 26,498	$ 30,635