Investment Securities [Line Items]

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- Definition

Life of mortgage backed securities.

+ References

No definition available.

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- Definition

Percentage of aggregate depreciation in unrealized losses.

+ References

No definition available.

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- Definition

Securities Pledged as Collateral

+ References

No definition available.

+ Details

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- Definition

Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aaa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479106/326-30-50-9

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479106/326-30-50-9

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- Definition

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479106/326-30-50-4

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- Definition

The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-12

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- Definition

Amount of realized gain (loss) on investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1

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- Definition

Debt securities issued by a United States government agency such as Government National Mortgage Association (Ginnie Mae), Federal Home Loan Mortgage Corporation (Freddie Mac), and Federal National Mortgage Association (Fannie Mae), which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

No definition available.

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Investment Securities - Additional Information (Detail)	3 Months Ended		9 Months Ended
Investment Securities - Additional Information (Detail)	Sep. 30, 2023 USD ($) investmentSecurity securityLoan	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) investmentSecurity securityLoan	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Investment Securities [Line Items]
Proceeds from the sale of investment securities	$ 0	$ 0	$ 24,200,000	$ 0
Gross realized gain from the sale of investment securities			200,000
Securities pledged as collateral	585,000,000		585,000,000		$ 595,800,000
Residential real estate mortgage-backed securities	1,400,000,000		$ 1,400,000,000
Life of mortgage-backed securities			6 years 9 months 7 days
Allowance for credit losses	0		$ 0		0
Obligations of U.S. government agencies
Investment Securities [Line Items]
Allowance for credit losses	$ 0		$ 0		0
Number of available for sale securities in unrealized loss position (in investment securities) \| investmentSecurity	263		263
Percentage of aggregate depreciation in unrealized losses	15.87%		15.87%
Obligations of states and political subdivisions
Investment Securities [Line Items]
Allowance for credit losses	$ 0		$ 0		0
Number of available for sale securities in unrealized loss position (in investment securities) \| investmentSecurity	184		184
Percentage of aggregate depreciation in unrealized losses	15.99%		15.99%
Corporate bonds
Investment Securities [Line Items]
Allowance for credit losses	$ 0		$ 0		0
Number of available for sale securities in unrealized loss position (in investment securities) \| investmentSecurity	6		6
Percentage of aggregate depreciation in unrealized losses	10.78%		10.78%
Asset backed securities
Investment Securities [Line Items]
Allowance for credit losses	$ 0		$ 0		0
Number of available for sale securities in unrealized loss position (in investment securities) \| investmentSecurity	40		40
Percentage of aggregate depreciation in unrealized losses	1.82%		1.82%
Non-agency collateralized mortgage obligations
Investment Securities [Line Items]
Allowance for credit losses	$ 0		$ 0		$ 0
Number of available for sale securities in unrealized loss position (in investment securities) \| securityLoan	24		24
Percentage of aggregate depreciation in unrealized losses	11.85%		11.85%