Borrowings - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2024	Dec. 31, 2023
Line Of Credit Facility [Line Items]
Advance from the Federal Home Loan Bank	$ 480,400,000	$ 380,400,000
Interest expense on FHLBNY advances	7,900,000	3,900,000
Overnight Line of Credit Advance
Line Of Credit Facility [Line Items]
Advance from the Federal Home Loan Bank	$ 0	0
FRBNY
Line Of Credit Facility [Line Items]
Percentage of total securities portfolio	36.70%
Securities portfolio amortized cost	$ 216,800,000
Outstanding term advances from FRBNY	$ 200,000,000	$ 304,000,000

Advances from federal reserve banks.

No definition available.

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- Definition

Percentage of securities portfolio.

+ References

No definition available.

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- Definition

Securities portfolio amortized cost.

+ References

No definition available.

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- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 470
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480876/942-470-45-1

+ Details

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- Definition

Amount of interest expense on interest-bearing deposits from another Federal Home Loan Bank (FHLBank).

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

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