Short-Term Borrowings (Short-Term Federal Home Loan Bank Borrowings) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Amount outstanding at end of year	$ 313,520	$ 312,945
Federal Home Loan Bank Advances [Member]
Short-term Debt [Line Items]
Average daily balance during the year	287,778	238,234
Maximum month-end balance during the year	363,900	292,690
Amount outstanding at end of year	$ 293,800	$ 292,690