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Securities Available-For-Sale (Details)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
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   $ 106.0 $ 121.9
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.