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Investment Securities (Details) $ in Thousands | 12 Months Ended
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Dec. 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 $210,000 Net increase to accumulated |  | $ 210,000
Net increase to accumulated other comprehensive income net of tax |  | $ 7,400
Number of Investment Securities Sold | Integer | 112 | 84
Available-for-sale Securities Pledged as Collateral | $ 157,800 | $ 121,900
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.

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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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- Definition Amount of fresh-start adjustment to accumulated other comprehensive Income or Loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
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