XML 149 R97.htm IDEA: XBRL DOCUMENT
v3.25.4

Deposits - Schedule of Deposits (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Deposits [Abstract] |  |
Demand checking accounts | $ 4,032,529 | $ 1,692,394
NOW accounts | 1,445,894 | 617,246
Savings accounts | 2,954,029 | 1,721,247
Money market accounts (Non-payroll) | 4,636,548 | 2,116,360
Total core deposit accounts | 13,069,000 | 6,147,247
Certificate of deposit accounts maturing: |  |
Within six months | 2,983,888 | 1,287,280
After six months but within 1 year | 872,307 | 492,098
After 1 year but within 2 years | 266,649 | 78,153
After 2 years but within 3 years | 21,781 | 13,188
After 3 years but within 4 years | 5,512 | 12,028
After 4 years but within 5 years | 6,137 | 2,498
5+ Years | 266 | 199
Total certificate of deposit accounts | 4,156,540 | 1,885,444
Payroll deposits | 1,878,758 | 0
Brokered deposit accounts | 410,359 | 868,953
Total deposits | $ 19,514,657 | $ 8,901,644
Weighted Average Rate of Demand checking accounts |  |
Demand checking accounts | 0.00% | 0.00%
NOW accounts | 0.88% | 0.57%
Savings accounts | 1.82% | 4.40%
Money market accounts (Non-payroll) | 2.62% | 2.58%
Total core deposit accounts | 2.06% | 2.18%
Weighted Average Rate of Certificate of deposit accounts maturing: |  |
Within six months | 3.64% | 4.48%
After six months but within 1 year | 3.48% | 4.06%
After 1 year but within 2 years | 3.27% | 3.34%
After 2 years but within 3 years | 2.06% | 2.13%
After 3 years but within 4 years | 0.79% | 3.27%
After 4 years but within 5 years | 0.47% | 1.16%
5+ Years | 0.49% | 0.50%
Total certificate of deposit accounts | 3.56% | 4.30%
Payroll deposits | 3.42% | 0.00%
Brokered deposit accounts | 4.13% | 4.42%
Total deposits | 2.06% | 2.85%

X
- Definition The weighted average interest rate for demand deposit liabilities, excluding brokered deposits. + References No definition available. + Details
Name: | brkl_DemandDepositAccountsWeightedAverageRate
Namespace Prefix: | brkl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Deposits, Brokered Deposits + References No definition available. + Details
Name: | brkl_DepositsBrokeredDeposits
Namespace Prefix: | brkl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the portion of the balance sheet assertion valued at fair value by the entity, whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with fair value disclosures required in the footnote disclosures to the financial statements. This item represents the amount of fair values of deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; it may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) excluding certificates of deposit or time deposits. + References No definition available. + Details
Name: | brkl_DepositsExcludingTimeDepositsFairValueDisclosure
Namespace Prefix: | brkl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The weighted average interest rate for money market demand account deposit liabilities. + References No definition available. + Details
Name: | brkl_DepositsMoneyMarketDepositsWeightedAverageRate
Namespace Prefix: | brkl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The weighted average interest rate for notice of withdrawal demand deposit liabilities. + References No definition available. + Details
Name: | brkl_DepositsNegotiableOrderOfWithdrawalNOWWeightedAverageRate
Namespace Prefix: | brkl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Deposits, Payroll deposits + References No definition available. + Details
Name: | brkl_DepositsPayrollDeposits
Namespace Prefix: | brkl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The weighted average interest rate for savings deposit liabilities. + References No definition available. + Details
Name: | brkl_DepositsSavingsDepositsWeightedAverageRate
Namespace Prefix: | brkl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Money Market Deposits, Non-Payroll + References No definition available. + Details
Name: | brkl_MoneyMarketDepositsNonPayroll
Namespace Prefix: | brkl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of time deposits (including certificates of deposits, individual retirement accounts and open accounts) held by the entity with a remaining term of six months or less. + References No definition available. + Details
Name: | brkl_TimeDepositMaturitiesSixMonths
Namespace Prefix: | brkl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of time deposits (including certificates of deposits, individual retirement accounts and open accounts) held by the entity with a remaining term of greater than six months, but twelve months or less. + References No definition available. + Details
Name: | brkl_TimeDepositMaturitiesSixToTwelveMonths
Namespace Prefix: | brkl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Weighted average interest rate for time deposits held by the entity. + References No definition available. + Details
Name: | brkl_TimeDepositsWeightedAverageInterestRateMaturities
Namespace Prefix: | brkl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Time Deposits Weighted Average Interest Rate Maturities Brokered Deposit Accounts + References No definition available. + Details
Name: | brkl_TimeDepositsWeightedAverageInterestRateMaturitiesBrokeredDepositAccounts
Namespace Prefix: | brkl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Time Deposits Weighted Average Interest Rate Maturities Payroll Deposits + References No definition available. + Details
Name: | brkl_TimeDepositsWeightedAverageInterestRateMaturitiesPayrollDeposits
Namespace Prefix: | brkl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average interest rate for time deposits held by the entity with maturities of six months or less. + References No definition available. + Details
Name: | brkl_TimeDepositsWeightedAverageInterestRateMaturitiesSixMonths
Namespace Prefix: | brkl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average interest rate for time deposits held by the entity with a remaining term of greater than six months, but twelve months or less. + References No definition available. + Details
Name: | brkl_TimeDepositsWeightedAverageInterestRateMaturitiesSixToTwelveMonths
Namespace Prefix: | brkl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | brkl_WeightedAverageRateDepositLiabilitiesAbstract
Namespace Prefix: | brkl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the weighted average interest rate on all deposits of the entity. + References No definition available. + Details
Name: | brkl_WeightedAverageRateDeposits
Namespace Prefix: | brkl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The weighted average interest rate for all transaction deposit liabilities. + References No definition available. + Details
Name: | brkl_WeightedAverageRateTransactionDeposits
Namespace Prefix: | brkl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of money in accounts that may bear interest and that the depositor is entitled to withdraw at any time without prior notice. + References Reference 1: 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(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
Name: | us-gaap_DemandDepositAccounts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: 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(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
Name: | us-gaap_Deposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DepositsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of deposits in interest-bearing transaction accounts at banks or savings and loans, that are restricted in regard to ownership and can usually only be held by individuals, nonprofit entities and governments. Negotiable order of withdrawal accounts differ from money market demand accounts as they typically have higher reserve requirements and no limit on the number of checks that can be written. + References Reference 1: 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(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
Name: | us-gaap_DepositsNegotiableOrderOfWithdrawalNOW
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs). + References Reference 1: 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(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
Name: | us-gaap_DepositsSavingsDeposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_MaturitiesOfTimeDepositsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of time deposit maturing after fifth fiscal year following current fiscal year. Time deposit includes, but is not limited to, certificate of deposit. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 470 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-1 + Details
Name: | us-gaap_TimeDepositMaturitiesAfterYearFive
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of time deposit maturing in fifth fiscal year following current fiscal year. Time deposit includes, but is not limited to, certificate of deposit. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 470 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-1 + Details
Name: | us-gaap_TimeDepositMaturitiesYearFive
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of time deposit maturing in fourth fiscal year following current fiscal year. Time deposit includes, but is not limited to, certificate of deposit. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 470 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-1 + Details
Name: | us-gaap_TimeDepositMaturitiesYearFour
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of time deposit maturing in third fiscal year following current fiscal year. Time deposit includes, but is not limited to, certificate of deposit. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 470 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-1 + Details
Name: | us-gaap_TimeDepositMaturitiesYearThree
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of time deposit maturing in second fiscal year following current fiscal year. Time deposit includes, but is not limited to, certificate of deposit. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 470 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-1 + Details
Name: | us-gaap_TimeDepositMaturitiesYearTwo
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of time deposit liabilities, including certificates of deposit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 405 -Topic 942 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478353/942-405-50-1 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(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
Name: | us-gaap_TimeDeposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Weighted average interest rate for time deposits held by the entity with maturities greater than five years. + References No definition available. + Details
Name: | us-gaap_TimeDepositsWeightedAverageInterestRateMaturitiesGreaterThanFiveYears
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average interest rate for time deposits held by the entity with maturities greater than four years, but five years or less. + References No definition available. + Details
Name: | us-gaap_TimeDepositsWeightedAverageInterestRateMaturitiesYearFive
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average interest rate for time deposits held by the entity with maturities greater than three years, but four years or less. + References No definition available. + Details
Name: | us-gaap_TimeDepositsWeightedAverageInterestRateMaturitiesYearFour
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average interest rate for time deposits held by the entity with maturities greater than two years, but three years or less. + References No definition available. + Details
Name: | us-gaap_TimeDepositsWeightedAverageInterestRateMaturitiesYearThree
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average interest rate for time deposits held by the entity with maturities greater than one year, but two years or less. + References No definition available. + Details
Name: | us-gaap_TimeDepositsWeightedAverageInterestRateMaturitiesYearTwo
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_WeightedAverageRateOfTimeDepositsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration