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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.

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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 + Details
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