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Borrowings and Borrowing Capacity - Summary of Customer Repurchase Agreements are Secured by Pledged Securities with Carrying Amount (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Pledged Securities	$ 85,985	$ 194,571
Pledged Securities | Customer Repurchase Agreements
Debt Instrument [Line Items]
Pledged Securities	13,460	13,486
Pledged Securities | Customer Repurchase Agreements | U.S. Government Agency Obligations
Debt Instrument [Line Items]
Pledged Securities	$ 13,460	10,488
Pledged Securities | Customer Repurchase Agreements | Mortgage-backed Securities, Residential
Debt Instrument [Line Items]
Pledged Securities		$ 2,998

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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.

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- Definition

Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729

+ Details

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