Assets & Liability Derivative Positions & the Potential Effect of Netting Arrangements - Current Quarter (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Offsetting Liabilities [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 17,339	$ 16,697
Derivative Asset, Collateral, Obligation to Return Cash, Offset	0	0
Derivative Asset	17,339	16,697
Derivative, Collateral, Obligation to Return Securities	698	2,823
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	16,641	13,874
Derivative Liability, Fair Value, Gross Liability	206,057	225,648
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	0	0
Derivative Liability	206,057	225,648
Derivative, Collateral, Right to Reclaim Securities	698	2,823
Derivative, Collateral, Right to Reclaim Cash	(159,176)	(179,550)
Derivative Liability, Fair Value, Amount Offset Against Collateral	1,004	3,799
Interest Rate Swap [Member]
Offsetting Liabilities [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Asset, Collateral, Obligation to Return Cash, Offset	0	0
Derivative Asset	0	0
Derivative, Collateral, Obligation to Return Securities	0	0
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Derivative Liability, Fair Value, Gross Liability	6,962	9,630
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	0	0
Derivative Liability	6,962	9,630
Derivative, Collateral, Right to Reclaim Securities	0	0
Derivative, Collateral, Right to Reclaim Cash	6,962	9,630
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Loan Level Swap [Member]
Offsetting Liabilities [Line Items]
Derivative Asset, Fair Value, Gross Asset	17,012	16,301
Derivative Asset, Collateral, Obligation to Return Cash, Offset	0	0
Derivative Asset	17,012	16,301
Derivative, Collateral, Obligation to Return Securities	698	2,823
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	16,314	13,478
Derivative Liability, Fair Value, Gross Liability	17,023	16,340
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	0	0
Derivative Liability	17,023	16,340
Derivative, Collateral, Right to Reclaim Securities	698	2,823
Derivative, Collateral, Right to Reclaim Cash	15,628	10,108
Derivative Liability, Fair Value, Amount Offset Against Collateral	698	3,409
Foreign Exchange Contract [Member]
Offsetting Liabilities [Line Items]
Derivative Asset, Fair Value, Gross Asset	327	396
Derivative Asset, Collateral, Obligation to Return Cash, Offset	0	0
Derivative Asset	327	396
Derivative, Collateral, Obligation to Return Securities	0	0
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	327	396
Derivative Liability, Fair Value, Gross Liability	306	390
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	0	0
Derivative Liability	306	390
Derivative, Collateral, Right to Reclaim Securities	0	0
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	306	390
Customer Repurchase Agreements [Domain]
Offsetting Liabilities [Line Items]
Derivative Liability, Fair Value, Gross Liability	131,766	149,288
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	0	0
Derivative Liability	131,766	149,288
Derivative, Collateral, Right to Reclaim Securities	0	0
Derivative, Collateral, Right to Reclaim Cash	(131,766)	(149,288)
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Wholesale Repurchase Agreements [Member]
Offsetting Liabilities [Line Items]
Derivative Liability, Fair Value, Gross Liability	50,000	50,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	0	0
Derivative Liability	50,000	50,000
Derivative, Collateral, Right to Reclaim Securities	0	0
Derivative, Collateral, Right to Reclaim Cash	(50,000)	(50,000)
Derivative Liability, Fair Value, Amount Offset Against Collateral	$ 0	$ 0