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Investment Securities - Summary of Held to Maturity Debt Securities by Stated Maturity (Detail) $ in Thousands	Sep. 30, 2022 USD ($)
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	$ 886,294
Fair Value	854,737
Asset-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	400,001
Fair Value	400,001
Agency-guaranteed residential mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	7,781
Fair Value	7,079
Agency-guaranteed commercial mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	1,947
Fair Value	1,851
Agency-guaranteed residential collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	209,519
Fair Value	192,838
Agency-guaranteed commercial collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	152,794
Fair Value	146,605
Private label collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	114,252
Fair Value	$ 106,363

X

- Definition

Amount excluding accrued interest, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) without single maturity date and not allocated over maturity grouping.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126980459&loc=d3e62586-112803

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity), without single maturity date and not allocated over maturity grouping.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5B
-URI https://asc.fasb.org/extlink&oid=126970911&loc=SL120269825-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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