Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Risk Management [Member]
Summary of Derivative Instruments [Abstract]
Notional Amount	$ 0	$ 0
Derivative, Fair Value, Net	0	0
Non-designated hedging instruments | Client-Related | Interest rate swap contracts
Summary of Derivative Instruments [Abstract]
Notional Amount	379,778	394,852
Non-designated hedging instruments | Client-Related | Foreign Exchange Forward [Member]
Summary of Derivative Instruments [Abstract]
Notional Amount	1,482	1,528
Non-designated hedging instruments | Client-Related | Other Assets | Interest rate swap contracts
Summary of Derivative Instruments [Abstract]
Asset derivatives (other assets), fair value	2,524	2,061
Non-designated hedging instruments | Client-Related | Other Assets | Foreign Exchange Forward [Member]
Summary of Derivative Instruments [Abstract]
Asset derivatives (other assets), fair value	1,482	1,528
Non-designated hedging instruments | Client-Related | Other Liabilities | Interest rate swap contracts
Summary of Derivative Instruments [Abstract]
Liability derivatives (other liabilities), fair value	2,524	2,061
Non-designated hedging instruments | Client-Related | Other Liabilities | Foreign Exchange Forward [Member]
Summary of Derivative Instruments [Abstract]
Liability derivatives (other liabilities), fair value	$ 1,482	$ 1,528