The fair value of available-for-sale securities that serve as collateral for borrowings.

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=66008989&loc=d3e5086-111524

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Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563

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Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Securities - Additional Information (Details) $ in Millions	Dec. 31, 2016 USD ($) security	Dec. 31, 2015 USD ($)
Investments, Debt and Equity Securities [Abstract]
Securities pledged as collateral \| $	$ 24.6	$ 75.0
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities, unrealized loss position more than 12 months	1
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities, unrealized loss position more than 12 months	13
Number of securities	128
State and political subdivision
Schedule of Available-for-sale Securities [Line Items]
Number of securities	66
U.S. agency collateralized mortgage obligations: residential
Schedule of Available-for-sale Securities [Line Items]
Number of securities	24
U.S. agency mortgage-backed securities: residential
Schedule of Available-for-sale Securities [Line Items]
Number of securities	17
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities	8
U.S. government sponsored entities and agencies
Schedule of Available-for-sale Securities [Line Items]
Number of securities	8
U.S. Treasury and federal agency
Schedule of Available-for-sale Securities [Line Items]
Number of securities	5