Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) - Not Designated as Hedging Instrument [Member] $ in Thousands	Dec. 31, 2018 USD ($) position	Dec. 31, 2017 USD ($) position
Receive fixed, pay variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1) | position	235	246
Less than 1 year	$ 50,702	$ 36,023
Less than 2 years	124,222	61,500
Less than 3 years	97,904	152,287
Less than 4 years	47,308	111,147
Thereafter	631,471	591,385
Total	951,607	952,342
Fair Value	$ (2,907)	$ 3,875
Pay fixed, receive variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1) | position	220	231
Less than 1 year	$ 50,702	$ 36,023
Less than 2 years	124,222	61,500
Less than 3 years	97,904	152,287
Less than 4 years	47,308	111,147
Thereafter	631,471	591,385
Total	951,607	952,342
Fair Value	$ 2,903	$ (3,880)
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	27	15
Less than 1 year	$ 60,297	$ 26,382
Less than 2 years	3,505	3,780
Total	63,802	30,162
Fair Value	$ (1,404)	$ 1,202
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	27	15
Less than 1 year	$ 60,297	$ 26,382
Less than 2 years	3,505	3,780
Total	63,802	30,162
Fair Value	$ 1,434	$ (1,188)