Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) $ in Thousands	Dec. 31, 2016 USD ($) position	Dec. 31, 2015 USD ($) position
Summary of customer related derivative positions, not designated as hedging
Total	$ 75,000	$ 75,000
Fair Value	$ 624	$ (3,273)
Not Designated as Hedging Instrument [Member] | Receive fixed, pay variable | Loan level derivatives
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1) | position	222	171
Less than 1 year	$ 30,245	$ 37,732
Less than 2 years	21,708	34,424
Less than 3 years	63,771	29,629
Less than 4 years	165,783	77,041
Thereafter	567,897	488,110
Total	849,404	666,936
Fair Value	$ 12,005	$ 22,467
Not Designated as Hedging Instrument [Member] | Pay fixed, receive variable | Loan level derivatives
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1) | position	207	165
Less than 1 year	$ 30,245	$ 37,732
Less than 2 years	21,708	34,424
Less than 3 years	63,771	29,629
Less than 4 years	165,783	77,041
Thereafter	567,897	488,110
Total	849,404	666,936
Fair Value	$ (12,008)	$ (22,462)
Not Designated as Hedging Instrument [Member] | Buys foreign currency, sells U.S. currency | Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1) | position	33	21
Less than 1 year	$ 45,711	$ 38,416
Total	45,711	38,416
Fair Value	$ (2,250)	$ (354)
Not Designated as Hedging Instrument [Member] | Buys U.S. currency, sells foreign currency | Foreign exchange contracts
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1) | position	33	21
Less than 1 year	$ 45,711	$ 38,416
Total	45,711	38,416
Fair Value	$ 2,277	$ 382