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Borrowings - Schedule of Debt (Detail) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 900,132,000
Advances from federal home loan banks	$ 227,907,000	$ 245,117,000
Federal Home Loan Bank, Advances, Maturing Through 2033
Debt Instrument [Line Items]
Weighted average interest rate	2.13%	2.06%
Advances from federal home loan banks	$ 227,907,000	$ 245,117,000
Federal Home Loan Bank, Advances, Maturing Through 2033 | Minimum
Debt Instrument [Line Items]
Fixed interest rate	1.27%	1.17%
Federal Home Loan Bank, Advances, Maturing Through 2033 | Maximum
Debt Instrument [Line Items]
Fixed interest rate	5.24%	5.24%
Federal Home Loan Bank, Advances, Open Repo Borrowings
Debt Instrument [Line Items]
Fixed interest rate		1.81%
Maximum borrowing capacity		$ 150,000
Advances from federal home loan banks	$ 0	$ 0

X

- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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- Definition

Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(3)(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-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

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22 (b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Interest rate of advances made and reported by Federal Home Loan Bank (FHLBank).

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Weighted average interest rate on advances made and reported by Federal Home Loan Bank (FHLBank).

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