Loans and Allowance for Loan Losses (Loans Pledged) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Loans Receivable, Net [Abstract]
Loans pledged to collateralize FHLB advances and letters of credit	$ 111.7	$ 127.2
Pledged financial instruments, Not separately reported, securities, for Federal Home Loan Bank debt	118.6	124.6
Credit availability for borrowing under FHLB advances and letters of credit	108.3	$ 130.8
Loans pledged to collateralize potential borrowings from Federal Reserve Discount Window	4.4
Pledged Financial Instruments, Not Separately Reported, investment securities, for Federal Reserve Bank	46.8
Borrowing capacity under Federal Reserve Discount Window	49.2
Federal Home Loan Bank Advances and Line of Credit, Amount of Available Borrowing	$ 255.3