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Borrowings - Borrowings (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2016
Borrowings Under Repurchase Agreements [Line items]
Notes payable, variable rate	2.75%
Notes payable, due date	Jul. 13, 2019
Maximum [Member]
Borrowings Under Repurchase Agreements [Line items]
Federal Home Loan Bank advances, variable and fixed rates	7.53%
Minimum [Member]
Borrowings Under Repurchase Agreements [Line items]
Federal Home Loan Bank advances, variable and fixed rates	0.74%

X

- Definition

Borrowings Under Repurchase Agreements [Line items]

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

States the interest rate applicable to Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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