Derivative Financial Instruments Master Netting Arrangements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts Of Recognized Assets	$ 196,346		$ 156,683
Gross Assets Offset Under Master Netting Arrangements	(70)		(222)
Net Amounts Of Assets Presented in Statement Of Financial Position	196,276		156,461
Net Amounts Of Assets Presented in Statement Of Financial Position	14,013		13,437
Gross Assets Subect To Master Netting Arrangement Not Offset	(181,547)		(144,195)
Cash Collateral Received Subject to Master Netting Arrangements	5,080		6,110
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	9,649		6,156
Gross Amounts Of Recognized Liabilities	14,083		13,659
Gross Liabilities Offset Under Master Netting Arrangements	(70)		(222)
Gross Liabilities Subect To Master Netting Arrangement Not Offset	(9,648)		(6,920)
Cash Collateral Pledged Subject to Master Netting Arrangements	0		0
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	4,365		6,517
Securities purchased under agreements to resell	172,989	[1]	133,357	[1]
Derivative [Member]
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts Of Recognized Assets	23,357		23,326
Gross Assets Offset Under Master Netting Arrangements	(70)		(222)
Net Amounts Of Assets Presented in Statement Of Financial Position	23,287		23,104
Net Amounts Of Assets Presented in Statement Of Financial Position	14,013		13,437
Gross Assets Subect To Master Netting Arrangement Not Offset	(8,558)		(10,838)
Cash Collateral Received Subject to Master Netting Arrangements	5,080		6,110
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	9,649		6,156
Gross Amounts Of Recognized Liabilities	14,083		13,659
Gross Liabilities Offset Under Master Netting Arrangements	(70)		(222)
Gross Liabilities Subect To Master Netting Arrangement Not Offset	(9,648)		(6,920)
Cash Collateral Pledged Subject to Master Netting Arrangements	0		0
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	4,365		6,517
Derivative [Member] | Interest rate swaps
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts Of Recognized Assets	6,492		9,005
Gross Assets Offset Under Master Netting Arrangements	0		0
Net Amounts Of Assets Presented in Statement Of Financial Position	6,492		9,005
Gross Assets Subect To Master Netting Arrangement Not Offset	(1,412)		(2,895)
Cash Collateral Received Subject to Master Netting Arrangements	5,080		6,110
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	0		0
Derivative [Member] | Foreign exchange forwards
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts Of Recognized Assets	15,096		12,352
Gross Assets Offset Under Master Netting Arrangements	0		0
Net Amounts Of Assets Presented in Statement Of Financial Position	15,096		12,352
Net Amounts Of Assets Presented in Statement Of Financial Position	12,183		11,658
Gross Assets Subect To Master Netting Arrangement Not Offset	(6,735)		(7,363)
Cash Collateral Received Subject to Master Netting Arrangements	0		0
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	8,361		4,989
Gross Amounts Of Recognized Liabilities	12,183		11,658
Gross Liabilities Offset Under Master Netting Arrangements	0		0
Gross Liabilities Subect To Master Netting Arrangement Not Offset	(8,282)		(5,720)
Cash Collateral Pledged Subject to Master Netting Arrangements	0		0
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	3,901		5,938
Derivative [Member] | Foreign currency options
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts Of Recognized Assets	504		1,411
Gross Assets Offset Under Master Netting Arrangements	(70)		(222)
Net Amounts Of Assets Presented in Statement Of Financial Position	434		1,189
Net Amounts Of Assets Presented in Statement Of Financial Position	434		1,189
Gross Assets Subect To Master Netting Arrangement Not Offset	(155)		(556)
Cash Collateral Received Subject to Master Netting Arrangements	0		0
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	279		633
Gross Amounts Of Recognized Liabilities	504		1,411
Gross Liabilities Offset Under Master Netting Arrangements	(70)		(222)
Gross Liabilities Subect To Master Netting Arrangement Not Offset	(279)		(633)
Cash Collateral Pledged Subject to Master Netting Arrangements	0		0
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	155		556
Derivative [Member] | Client interest rate derivatives
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts Of Recognized Assets	1,265		558
Gross Assets Offset Under Master Netting Arrangements	0		0
Net Amounts Of Assets Presented in Statement Of Financial Position	1,265		558
Net Amounts Of Assets Presented in Statement Of Financial Position	1,396		590
Gross Assets Subect To Master Netting Arrangement Not Offset	(256)		(24)
Cash Collateral Received Subject to Master Netting Arrangements	0		0
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	1,009		534
Gross Amounts Of Recognized Liabilities	1,396		590
Gross Liabilities Offset Under Master Netting Arrangements	0		0
Gross Liabilities Subect To Master Netting Arrangement Not Offset	(1,087)		(567)
Cash Collateral Pledged Subject to Master Netting Arrangements	0		0
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	309		23
Reverse Repurchase Securities Borrowing And Similar Arrangements [Member]
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts Of Recognized Assets	172,989		133,357
Gross Assets Offset Under Master Netting Arrangements	0		0
Net Amounts Of Assets Presented in Statement Of Financial Position	172,989		133,357
Net Amounts Of Assets Presented in Statement Of Financial Position	0		0
Gross Assets Subect To Master Netting Arrangement Not Offset	(172,989)		(133,357)
Cash Collateral Received Subject to Master Netting Arrangements	0		0
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	0		0
Gross Amounts Of Recognized Liabilities	0		0
Gross Liabilities Offset Under Master Netting Arrangements	0		0
Gross Liabilities Subect To Master Netting Arrangement Not Offset	0		0
Cash Collateral Pledged Subject to Master Netting Arrangements	0		0
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	$ 0		$ 0

[1] At December 31, 2013 and 2012, securities purchased under agreements to resell were collateralized by U.S. Treasury securities and U.S. agency securities with aggregate fair values of $176 million and $136 million, respectively. None of these securities received as collateral were sold or repledged as of December 31, 2013 and 2012.