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BORROWINGS - Additional Information (Details) | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2024 USD ($) agreement | Dec. 31, 2023 USD ($) agreement | Dec. 31, 2007 USD ($) security
Debt Instrument [Line Items] |  |  |  |
Prepayments of the FHLB borrowings |  | $ 2,000,000,000 | $ 1,800,000,000 |
Remaining borrowing capacity |  | 1,100,000,000 | 993,800,000 |
Naming applicable municipalities as beneficiaries |  | 155,500,000 | 155,700,000 |
Loans receivable |  | 4,479,692,000 | 4,468,476,000 |
Maximum amount of Open Repo borrowing available |  | 0 | 0 |
Unamortized debt issuance costs |  | 600,000 | 700,000 |
Federal Home Loan Bank, Advances, Open Repo Borrowings |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Federal home loan balance |  | $ 250,000,000 | 250,000,000 |
Commitment term |  | 364 days |  |
Maximum amount of Open Repo borrowing available |  | $ 0 | 0 |
Federal Reserve Bank Advances | Federal Reserve BIC Program |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Federal home loan balance |  | 233,000,000 |  |
Prepayments of the FHLB borrowings |  | 78,200,000 |  |
Loans receivable |  | 240,500,000 |  |
Maximum amount of Open Repo borrowing available |  | $ 0 | $ 0 |
Subordinated Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of preferred trust securities | security |  |  |  | 2
Floating rate trust preferred securities |  |  |  | $ 10,000,000
Effective percentage |  | 7.15% | 7.20% |
Trust preferred securities, interest payment deferment period |  | 5 years |  |
Subordinated Debt | Notes Maturing In June 2031 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating rate trust preferred securities | $ 85,000,000 |  |  |
Interest rate, percentage | 3.25% |  |  |
Proceeds from issuance of subordinated notes, net of issuance costs | $ 83,500,000 |  |  |
Subordinated Debt | SOFR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit, basis spread on variable rate |  | 1.55% |  |
Credit spread adjustment (as percent) |  | 0.26161% |  |
Subordinated Debt | SOFR | Notes Maturing In June 2031 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit, basis spread on variable rate |  | 2.58% |  |
Subordinated Debt | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit, basis spread on variable rate |  |  |  | 1.55%
Line of Credit | Overnight Borrowing Agreements |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit, outstanding amount |  | $ 0 | $ 0 |
Line of Credit | Unsecured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of unsecured lines of credit issued | agreement |  | 1 | 1 |
Pledge on certain loan amount |  | $ 10,000,000 | $ 10,000,000 |
Line of credit, outstanding amount |  | $ 0 | $ 0 |
Line of Credit | Unsecured Debt | SOFR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit, basis spread on variable rate |  | 2.85% |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 + Details
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