Securities - Additional Information (Details)	3 Months Ended	12 Months Ended
Mar. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($) security
Investments, Debt and Equity Securities [Abstract]
Number of securities in unrealized loss positions \| security	2,320	2,290
Unrealized loss positions	$ 2,100,000,000	$ 2,100,000,000
Percentage of portfolio	86.00%	85.10%
Allowance for credit loss	$ 158,000	$ 157,000
Accrued interest receivable on available for sale debt securities	14,400,000	14,700,000
Allowance for credit losses for available for sale debt securities	$ 0	$ 0

Debt Securities, Accrued Interest

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- Definition

Debt Securities, Available-For-Sale And Held To Maturity, Unrealized Loss Position

+ References

No definition available.

+ Details

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- Definition

Debt Securities, Available-For-Sale And Held To Maturity, Unrealized Loss Position, Percentage Of Portfolio

+ References

No definition available.

+ Details

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- Definition

Amount excluding accrued interest, 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 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

+ Details

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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

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

+ References

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

+ Details

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- References

No definition available.

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