Securities (Schedule of Securities with Unrealized Losses) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) investment	Dec. 31, 2016 USD ($) investment
Less than 12 Months
Fair Value	$ 152,318	$ 464,958
Unrealized Loss	(1,188)	(12,460)
12 Months or More
Fair Value	139,294	47,271
Unrealized Loss	(3,172)	(1,636)
Total
Fair Value	291,612	512,229
Unrealized Loss	$ (4,360)	(14,096)
Number of equity securities held in non-controlling investment banking | investment	1
Original investment of equity security	$ 1,350
U.S. Treasury and Agency Securities
Less than 12 Months
Fair Value	0	0
Unrealized Loss	0	0
12 Months or More
Fair Value	9,898	0
Unrealized Loss	(102)	0
Total
Fair Value	9,898	0
Unrealized Loss	(102)	0
Obligations of State and Political Subdivisions
Less than 12 Months
Fair Value	1,891	108,918
Unrealized Loss	(15)	(3,678)
12 Months or More
Fair Value	356	0
Unrealized Loss	(3)	0
Total
Fair Value	2,247	108,918
Unrealized Loss	(18)	(3,678)
MBS/CMO – Residential
Less than 12 Months
Fair Value	150,427	356,040
Unrealized Loss	(1,173)	(8,782)
12 Months or More
Fair Value	129,040	47,271
Unrealized Loss	(3,067)	(1,636)
Total
Fair Value	279,467	403,311
Unrealized Loss	(4,240)	(10,418)
Equity Securities
Less than 12 Months
Fair Value	0	0
Unrealized Loss	0	0
12 Months or More
Fair Value	0	0
Unrealized Loss	0	0
Total
Fair Value	0	0
Unrealized Loss	0	$ 0
Number of equity securities held in non-controlling investment banking | investment		1
Other than temporary impairment losses in available for sale securities recognized	$ 997