Investment Securities - Summary of Amortized Cost of Debt Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
AAA/AA/A
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Securities held to maturity	$ 80,789	$ 90,544
BBB/BB/B
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Securities held to maturity	0	0
Obligations of U.S. government agencies \| AAA/AA/A
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Securities held to maturity	79,225	88,980
Obligations of U.S. government agencies \| BBB/BB/B
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Securities held to maturity	0	0
Obligations of states and political subdivisions \| AAA/AA/A
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Securities held to maturity	1,564	1,564
Obligations of states and political subdivisions \| BBB/BB/B
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Securities held to maturity	$ 0	$ 0

Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-14

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482736/825-10-45-1A

Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-7A

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

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