Mortgage Banking Derivatives - Summary of Notional Amount and Fair Value of Mortgage Banking Derivatives (Detail) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Included in mortgage banking derivatives asset:
Mortgage banking derivative asset, fair value	$ 883	$ 883
Included in mortgage banking derivative liabilities:
Mortgage banking derivative liability, fair value	26	58
Interest Rate Lock Commitments [Member]
Included in mortgage banking derivatives asset:
Derivative asset, notional amount	35,439	25,267
Included in mortgage banking derivatives asset:
Mortgage banking derivative asset, fair value	775	845
Forward Sale And Commitments [Member]
Included in mortgage banking derivatives asset:
Derivative asset, notional amount	3,927	3,452
Included in mortgage banking derivatives asset:
Mortgage banking derivative asset, fair value	108	38
To-be-announced Mortgage-backed Securities Trades [Member]
Included in mortgage banking derivative liabilities:
Derivative liability, notional amount	41,500	22,250
Included in mortgage banking derivative liabilities:
Mortgage banking derivative liability, fair value	$ 26	$ 58

Nominal or face amount used to calculate payments on the derivative asset.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SX 210.12-13(Column A)(Footnote 3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5C
-Subparagraph (SX 210.12-13C(Column E))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5C

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5A
-Subparagraph (SX 210.12-13A(Column D))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5B
-Subparagraph (SX 210.12-13B(Column B))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5B

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant