Securities Sold Under Agreements to Repurchase and Other Borrowings (Repurchase Agreements Outstanding) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Assets Sold under Agreements to Repurchase [Line Items]
Balance	$ 1,009,662	$ 1,076,160
Fair Value of Collateral	1,095,602
Weighted-Average Rate	1.67%
Weighted-Average Current Maturity	2 years 1 month 13 days
Maturity up to 30 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Balance	358,927
Fair Value of Collateral	366,371
Weighted-Average Rate	0.16%
Weighted-Average Current Maturity	2 days 3 hours 50 minutes
Maturity 31 to 90 Days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Balance	300
Fair Value of Collateral	315
Weighted-Average Rate	0.15%
Weighted-Average Current Maturity	2 months 12 days 18 hours 38 minutes
Maturity over 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Balance	650,435
Fair Value of Collateral	$ 728,916
Weighted-Average Rate	2.51%
Weighted-Average Current Maturity	3 years 3 months 15 days