Short-Term Borrowings (Narrative) (Details)	12 Months Ended
	Dec. 31, 2014 USD ($)
Short Term Debt [Line Items]
Fair value of capital markets trading securities pledged to secure other short-term borrowings	$ 172,900,000
Federal Funds Purchased [Member]
Short Term Debt [Line Items]
Maximum maturity days	90 days
Securities Sold Under Agreements To Repurchase [Member]
Short Term Debt [Line Items]
Maximum maturity days	90 days
Trading Liabilities [Member]
Short Term Debt [Line Items]
Maximum holding days	90 days
Other Short Term Borrowings [Member]
Short Term Debt [Line Items]
Maximum original maturity period	1 year