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Securities Available-For-Sale (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) 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 |  | 75 | 84
Available-for-sale Securities Pledged as Collateral |  | $ 139.5 | $ 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.

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