Derivative Financial Instruments Master Netting Arrangements (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts Of Recognized Assets	$ 163,374	$ 137,271
Gross Assets Offset Under Master Netting Arrangements	(5)	(274)
Net Amounts Of Assets Presented in Statement Of Financial Position	163,369	136,997
Gross Assets Subject To Master Netting Arrangement Not Offset	(150,979)	(117,783)
Cash Collateral Received Subject to Master Netting Arrangements	(1,900)	(7,781)
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	10,490	11,433
Gross Amounts Of Recognized Liabilities	30,742	31,385
Gross Liabilities Offset Under Master Netting Arrangements	(5)	(274)
Net Amounts Of Assets Presented in Statement Of Financial Position	30,737	31,111
Gross Liabilities Subject To Master Netting Arrangement Not Offset	(15,202)	(19,639)
Cash Collateral Pledged Subject to Master Netting Arrangements	0	0
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	15,535	11,472
Derivative
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts Of Recognized Assets	37,983	41,660
Gross Assets Offset Under Master Netting Arrangements	(5)	(274)
Net Amounts Of Assets Presented in Statement Of Financial Position	37,978	41,386
Gross Assets Subject To Master Netting Arrangement Not Offset	(25,588)	(22,172)
Cash Collateral Received Subject to Master Netting Arrangements	(1,900)	(7,781)
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	10,490	11,433
Gross Amounts Of Recognized Liabilities	30,742	31,385
Gross Liabilities Offset Under Master Netting Arrangements	(5)	(274)
Net Amounts Of Assets Presented in Statement Of Financial Position	30,737	31,111
Gross Liabilities Subject To Master Netting Arrangement Not Offset	(15,202)	(19,639)
Cash Collateral Pledged Subject to Master Netting Arrangements	0	0
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	15,535	11,472
Derivative | Interest rate swaps
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts Of Recognized Assets	2,768	4,609
Gross Assets Offset Under Master Netting Arrangements	0	0
Net Amounts Of Assets Presented in Statement Of Financial Position	2,768	4,609
Gross Assets Subject To Master Netting Arrangement Not Offset	(2,768)	(1,639)
Cash Collateral Received Subject to Master Netting Arrangements	0	(2,970)
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	0	0
Derivative | Foreign exchange forwards
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts Of Recognized Assets	30,531	34,004
Gross Assets Offset Under Master Netting Arrangements	0	0
Net Amounts Of Assets Presented in Statement Of Financial Position	30,531	34,004
Gross Assets Subject To Master Netting Arrangement Not Offset	(18,141)	(17,843)
Cash Collateral Received Subject to Master Netting Arrangements	(1,900)	(4,811)
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	10,490	11,350
Gross Amounts Of Recognized Liabilities	25,647	28,136
Gross Liabilities Offset Under Master Netting Arrangements	0	0
Net Amounts Of Assets Presented in Statement Of Financial Position	25,647	28,136
Gross Liabilities Subject To Master Netting Arrangement Not Offset	(10,818)	(16,808)
Cash Collateral Pledged Subject to Master Netting Arrangements	0	0
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	14,829	11,328
Derivative | Foreign currency options
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts Of Recognized Assets	711	501
Gross Assets Offset Under Master Netting Arrangements	(5)	(274)
Net Amounts Of Assets Presented in Statement Of Financial Position	706	227
Gross Assets Subject To Master Netting Arrangement Not Offset	(706)	(144)
Cash Collateral Received Subject to Master Netting Arrangements	0	0
Net Assets After Deducting Amounts Subject to Master Netting Arrangements	0	83
Gross Amounts Of Recognized Liabilities	711	501
Gross Liabilities Offset Under Master Netting Arrangements	(5)	(274)
Net Amounts Of Assets Presented in Statement Of Financial Position	706	227
Gross Liabilities Subject To Master Netting Arrangement Not Offset	0	(83)
Cash Collateral Pledged Subject to Master Netting Arrangements	0	0
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	706	144
Derivative | Client interest rate derivatives
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts Of Recognized Assets	3,973	2,546
Gross Assets Offset Under Master Netting Arrangements	0	0
Net Amounts Of Assets Presented in Statement Of Financial Position	3,973	2,546
Gross Assets Subject To Master Netting Arrangement Not Offset	(3,973)	(2,546)
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	4,384	2,748
Gross Liabilities Offset Under Master Netting Arrangements	0	0
Net Amounts Of Assets Presented in Statement Of Financial Position	4,384	2,748
Gross Liabilities Subject To Master Netting Arrangement Not Offset	(4,384)	(2,748)
Cash Collateral Pledged Subject to Master Netting Arrangements	0	0
Net Liabilities After Deducting Amounts Subject to Master Netting Arrangements	0	0
Reverse Repurchase Securities Borrowing And Similar Arrangements [Member]
Assets and Liabilities Subject to Master Netting Arrangements [Line Items]
Gross Amounts Of Recognized Assets	125,391	95,611
Gross Assets Offset Under Master Netting Arrangements	0	0
Net Amounts Of Assets Presented in Statement Of Financial Position	125,391	95,611
Gross Assets Subject To Master Netting Arrangement Not Offset	(125,391)	(95,611)
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
Net Amounts Of Assets Presented in Statement Of Financial Position	0	0
Gross Liabilities Subject 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