Derivative Instruments and Hedging Activities - Schedule of Derivative Instruments (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivative Asset [Abstract]
Notional Amount	$ 567,898	$ 404,928
Fair Value	44,485	12,621
Derivative Liability [Abstract]
Notional Amount	537,834	370,477
Fair Value	44,202	12,551
Customer derivatives – interest rate swaps
Derivative Asset [Abstract]
Notional Amount	527,942	369,623
Fair Value	44,256	12,550
Derivative Liability [Abstract]
Notional Amount	527,942	369,623
Fair Value	44,101	12,549
FX forwards
Derivative Asset [Abstract]
Notional Amount	4,975
Fair Value	105
Derivative Liability [Abstract]
Notional Amount	4,997
Fair Value	82
RPAs sold
Derivative Asset [Abstract]
Notional Amount	0	0
Fair Value	0	0
Derivative Liability [Abstract]
Notional Amount	4,895	854
Fair Value	19	2
RPAs purchased
Derivative Asset [Abstract]
Notional Amount	34,981	35,305
Fair Value	124	71
Derivative Liability [Abstract]
Notional Amount	0	0
Fair Value	$ 0	$ 0