Liquidity and Funds Management (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Unfunded pension plan obligations	$ 14.3	$ 14.5
Royal Bank [Member]
Short-term Debt [Line Items]
Available borrowing capacity at the federal home loan bank	180.0
Borrowings	97.5	107.9
Line of credit maximum borrowing capacity	10.0
Liquidity to deposits ratio (as a percent)	67.90%
Liquidity to deposits policy target (as a percent)	12.00%
Liquidity to total liabilities ratio (as a percent)	53.50%
Liquidity to liabilities policy target (as a percent)	10.00%
Royal Bank [Member] | Federal Reserve Bank Advances [Member]
Short-term Debt [Line Items]
Unpledged agency securities were available to be pledged as collateral	$ 5.7