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Cash and Due from Banks and Interest Bearing Deposits (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Federal Reserve [Member]
Cash and Cash Equivalents [Line Items]
Balance requirements	$ 73.5	$ 74.1
Cash accounts which exceeded federally insured limits	124.3
US Bank [Member]
Cash and Cash Equivalents [Line Items]
Cash accounts which exceeded federally insured limits	21.3
Fifth Third Bank [Member]
Cash and Cash Equivalents [Line Items]
Cash accounts which exceeded federally insured limits	0.3
Federal Home Loan Bank [Member]
Cash and Cash Equivalents [Line Items]
Cash accounts which exceeded federally insured limits	$ 3.5

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- Definition

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.

+ References

No definition available.

+ Details

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X

- Definition

Amount of cash subject to withdrawal restrictions, restricted deposits held as compensating balances, and cash and securities segregated in compliance with regulations (such as cash deposited in a special reserve account for the exclusive benefit of customers).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 305
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6478312&loc=d3e61473-112792

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- Definition

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

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