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Loan Servicing - Unpaid Principal Balance of Serviced Mortgage Loans for Others (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, end of period	$ 118,818	$ 139,303
Mortgage loans sold to Federal Home Loan Mortgage Corporation without recourse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, end of period	3,723	4,438
Mortgage loans sold to Federal National Mortgage Association without recourse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, end of period	114,895	134,550
Mortgage loans sold to Federal Home Loan Bank without recourse
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance, end of period	$ 200	$ 315

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- Definition

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+ References

No definition available.

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- Definition

Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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