Derivative Financial Instruments Master Netting Arrangements (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Offsetting Derivative Assets [Abstract]
Fair value	$ 78,947	$ 37,983
Derivative Asset, Fair Value, Gross Liability	0	(5)
Derivative Asset	78,947	37,978
Derivative, Collateral, Obligation to Return Securities	(42,356)	(25,588)
Derivative, Collateral, Obligation to Return Cash	(12,668)	(1,900)
Derivative Asset, Fair Value, Amount Offset Against Collateral	23,923	10,490
Offsetting Securities Purchased under Agreements to Resell [Abstract]
Securities Purchased under Agreements to Resell, Gross	64,028	125,391
Securities Purchased under Agreements to Resell, Liability	0	0
Securities Purchased under Agreements to Resell	64,028	125,391
Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Securities	(64,028)	(125,391)
Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Cash	0	0
Securities Purchased under Agreements to Resell, Amount Offset Against Collateral	0	0
Offsetting Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed [Abstract]
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Gross	142,975	163,374
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Liability	0	(5)
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed	142,975	163,369
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Collateral, Obligation to Return Securities	(106,384)	(150,979)
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Collateral, Obligation to Return Cash	(12,668)	(1,900)
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Amount Offset Against Collateral	23,923	10,490
Offsetting Derivative Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(64,438)	(30,742)
Derivative Liability, Fair Value, Gross Asset	0	5
Derivative Liability	64,438	30,737
Derivative, Collateral, Right to Reclaim Securities	29,319	15,202
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	(35,119)	(15,535)
Offsetting Securities Sold under Agreements to Repurchase [Abstract]
Securities Sold under Agreements to Repurchase, Gross	0	0
Securities Sold under Agreements to Repurchase, Asset	0	0
Securities Sold under Agreements to Repurchase	0	0
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	0	0
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	0	0
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	0	0
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract]
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Gross	(64,438)	(30,742)
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Asset	0	5
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned	(64,438)	(30,737)
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Securities	29,319	15,202
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Cash	0	0
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Amount Offset Against Collateral	(35,119)	(15,535)
Interest rate swaps
Offsetting Derivative Assets [Abstract]
Fair value	810	2,768
Derivative Asset, Fair Value, Gross Liability	0	0
Derivative Asset	810	2,768
Derivative, Collateral, Obligation to Return Securities	(721)	(2,768)
Derivative, Collateral, Obligation to Return Cash	(89)	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Foreign exchange forwards
Offsetting Derivative Assets [Abstract]
Fair value	57,644	30,531
Derivative Asset, Fair Value, Gross Liability	0	0
Derivative Asset	57,644	30,531
Derivative, Collateral, Obligation to Return Securities	(22,738)	(18,141)
Derivative, Collateral, Obligation to Return Cash	(12,579)	(1,900)
Derivative Asset, Fair Value, Amount Offset Against Collateral	22,327	10,490
Offsetting Derivative Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(44,285)	(25,647)
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative Liability	44,285	25,647
Derivative, Collateral, Right to Reclaim Securities	17,964	10,818
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	(26,321)	(14,829)
Foreign currency options
Offsetting Derivative Assets [Abstract]
Fair value	10,383	711
Derivative Asset, Fair Value, Gross Liability	0	(5)
Derivative Asset	10,383	706
Derivative, Collateral, Obligation to Return Securities	(8,806)	(706)
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	1,577	0
Offsetting Derivative Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(10,383)	(711)
Derivative Liability, Fair Value, Gross Asset	0	5
Derivative Liability	10,383	706
Derivative, Collateral, Right to Reclaim Securities	1,585	0
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	(8,798)	(706)
Client interest rate derivatives
Offsetting Derivative Assets [Abstract]
Fair value	10,110	3,973
Derivative Asset, Fair Value, Gross Liability	0	0
Derivative Asset	10,110	3,973
Derivative, Collateral, Obligation to Return Securities	(10,091)	(3,973)
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	19	0
Offsetting Derivative Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	(9,770)	(4,384)
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative Liability	9,770	4,384
Derivative, Collateral, Right to Reclaim Securities	9,770	4,384
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	$ 0	$ 0