Borrowings Schedule of Short-term Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Schedule of Short-Term Borrowings [Abstract]
Securities sold under repurchase agreements with customers	$ 330,016	$ 304,467	$ 323,086
Federal Home Loan Bank Advances, Short Term	0	60,000	0
Federal Funds Purchased	0	25,000	0
Short-term borrowings	$ 330,016	$ 389,467	$ 323,086