Securities - Summary of Amortized Cost of Held-to Maturity Debt Securities Aggregated by Credit Quality Indicator (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost, Held-to-maturity	$ 179,155	$ 183,145
U.S. Treasury Securities [Member]
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost, Held-to-maturity	5,404	5,397
U.S. Treasury Securities [Member] \| AAA / AA / A Rating [Member]
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost, Held-to-maturity	5,404	5,397
Mortgage-Backed Securities of Government Agencies [Member]
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost, Held-to-maturity	171,272	175,261
Mortgage-Backed Securities of Government Agencies [Member] \| AAA / AA / A Rating [Member]
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost, Held-to-maturity	171,272	175,261
State and Political Subdivisions [Member]
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost, Held-to-maturity	2,479	2,487
State and Political Subdivisions [Member] \| AAA / AA / A Rating [Member]
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Amortized Cost, Held-to-maturity	$ 2,479	$ 2,487

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

Reference 1: 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 2: 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 3: 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 4: 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

Reference 5: 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

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