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Securities Available-For-Sale (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Integer
Dec. 31, 2016
USD ($)
Integer
Investments, Debt and Equity Securities [Abstract]    
Increase in amortized cost basis of available-for-sale securities   $ 210.0
Net increase to accumulated other comprehensive income net of tax   $ 7.4
Number of Investment Securities Sold | Integer 82 84
Available-for-sale Securities Pledged as Collateral $ 129.2 $ 142.5
Description of Holding Securities there were no holdings of securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of stockholders' equity. there were no holdings of securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of stockholders' equity.