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Loans and Allowance for Loan Losses - Summary of Investment of PCI Loans (Detail) - Real Estate [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
30-89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	$ 553	$ 147
30-89 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0	0
30-89 Days Past Due [Member] | Construction, commercial [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0	0
30-89 Days Past Due [Member] | Mortgage, Commercial [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0	0
30-89 Days Past Due [Member] | Mortgage, Residential [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	553	147
30-89 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0	0
Greater than 90 Days Past Due & Accruing [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0	4
Greater than 90 Days Past Due & Accruing [Member] | Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0	0
Greater than 90 Days Past Due & Accruing [Member] | Construction, commercial [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0	0
Greater than 90 Days Past Due & Accruing [Member] | Mortgage, Commercial [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0	0
Greater than 90 Days Past Due & Accruing [Member] | Mortgage, Residential [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0	0
Greater than 90 Days Past Due & Accruing [Member] | Consumer [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	0	4
Current [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	64,637	83,878
Current [Member] | Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	3,461	8,903
Current [Member] | Construction, commercial [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	1,201	14,754
Current [Member] | Mortgage, Commercial [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	54,433	51,872
Current [Member] | Mortgage, Residential [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	5,179	7,474
Current [Member] | Consumer [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	363	875
Total Loans [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	65,190	84,029
Total Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	3,461	8,903
Total Loans [Member] | Construction, commercial [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	1,201	14,754
Total Loans [Member] | Mortgage, Commercial [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	54,433	51,872
Total Loans [Member] | Mortgage, Residential [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	5,732	7,621
Total Loans [Member] | Consumer [Member]
Financing Receivable, Past Due [Line Items]
Purchase loans	$ 363	$ 879

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+ References

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Amount of increase in financing receivable from purchase. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 11
-Subparagraph (h)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919244-210447

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

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