Derivatives and Hedging Activities (Customer Related Derivative Positions - Not Designated as Hedges) (Details) - Not Designated as Hedging Instrument [Member] $ in Thousands	Dec. 31, 2019 USD ($) position	Dec. 31, 2018 USD ($) position
Receive fixed, pay variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1) | position	299	235
Less than 1 year	$ 156,690	$ 50,702
Less than 2 years	125,203	124,222
Less than 3 years	85,603	97,904
Less than 4 years	165,599	47,308
Thereafter	1,044,315	631,471
Derivative, Notional Amount	1,577,410	951,607
Fair Value	$ 48,596	$ (2,907)
Pay fixed, receive variable | Loan level swaps
Summary of customer related derivative positions, not designated as hedging
Number of Positions (1) | position	290	220
Less than 1 year	$ 156,690	$ 50,702
Less than 2 years	125,203	124,222
Less than 3 years	85,603	97,904
Less than 4 years	165,599	47,308
Thereafter	1,044,315	631,471
Derivative, Notional Amount	1,577,410	951,607
Fair Value	$ (48,591)	$ 2,903
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	40	27
Less than 1 year	$ 91,434	$ 60,297
Less than 2 years		3,505
Derivative, Notional Amount	91,434	63,802
Fair Value	$ (81)	$ (1,404)
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	40	27
Less than 1 year	$ 91,434	$ 60,297
Less than 2 years		3,505
Derivative, Notional Amount	91,434	63,802
Fair Value	$ 123	$ 1,434