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Repurchase Agreements - Summary of Repurchase Agreements Accounted as Secured Borrowings (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	$ 97,301
Securities pledged for Repurchase Agreements, Total	109,581
Federal Agency Collateralized Mortgage Obligations [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities pledged for Repurchase Agreements, Total	33,579
Federal Agency Mortgage-backed Pools [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities pledged for Repurchase Agreements, Total	76,002
Remaining Contractual Maturity of the Agreements, Overnight and Continuous [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	97,301
Securities pledged for Repurchase Agreements, Total	109,581
Remaining Contractual Maturity of the Agreements, Overnight and Continuous [Member] | Federal Agency Collateralized Mortgage Obligations [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities pledged for Repurchase Agreements, Total	33,579
Remaining Contractual Maturity of the Agreements, Overnight and Continuous [Member] | Federal Agency Mortgage-backed Pools [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Securities pledged for Repurchase Agreements, Total	$ 76,002

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+ References

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Carrying value, as of the balance sheet date, of securities sold under agreements to repurchase where the transferor maintains effective control over the assets, accounting for them as secured debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 10
-Section 55
-Paragraph 51
-URI http://asc.fasb.org/extlink&oid=116647374&loc=d3e101761-111710

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(m)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Amount, before effects of master netting arrangements, of securities loaned to entities in exchange for collateral. Includes liabilities not subject to a master netting arrangement and elected not to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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