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Regulatory Capital - Summary of the Bank's Compliance (Details) $ in Thousands | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Savings Bank [Member] |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 838,042 | $ 825,104
Tier I (leverage) capital, capital level, percent | 0.0935 | 0.0947
Tier I (leverage) capital, requirement to be well-capitalized, amount | $ 448,089 | $ 435,792
Tier I (leverage) capital, requirement to be well-capitalized, percent | 0.0500 | 0.0500
Tier I (leverage) capital, excess, amount | $ 389,953 | $ 389,312
Tier I (leverage) capital, excess, percent | 0.0435 | 0.0447
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 838,042 | $ 825,104
Common Equity Tier I risk-based capital, capital level, percent | 0.1247 | 0.1222
Common Equity Tier I risk-based capital, requirement to be well-capitalized, amount | $ 436,783 | $ 438,878
Common Equity Tier I risk-based capital, requirement to be well-capitalized, percent | 0.065% | 0.065%
Common Equity Tier I risk-based capital, excess, amount | $ 401,259 | $ 386,226
Common Equity Tier I risk-based capital, excess, percent | 0.0597% | 0.0572%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 838,042 | $ 825,104
Tier I risk-based capital, capital level, percent | 0.1247 | 0.1222
Tier I risk-based capital, requirement to be well-capitalized, amount | $ 537,579 | $ 540,157
Tier I risk-based capital, requirement to be well-capitalized, percent | 0.0800 | 0.0800
Tier I risk-based capital, excess, amount | $ 300,463 | $ 284,947
Tier I risk-based capital, excess, percent | 0.0447 | 0.0422
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 880,553 | $ 864,999
Total risk-based capital, capital level, percent | 0.1310 | 0.1281
Total risk-based capital, requirement to be well-capitalized, amount | $ 671,974 | $ 675,196
Total risk-based capital, requirement to be well-capitalized, percent | 0.1000 | 0.1000
Total risk-based capital, excess, amount | $ 208,579 | $ 189,803
Total risk-based capital, excess, percent | 0.0310 | 0.0281
Holding Company |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 733,308 | $ 737,732
Tier I (leverage) capital, capital level, percent | 0.0818 | 0.0847
Tier I (leverage) capital, requirement to be well-capitalized, amount | $ 448,057 | $ 435,748
Tier I (leverage) capital, requirement to be well-capitalized, percent | 0.0500 | 0.0500
Tier I (leverage) capital, excess, amount | $ 285,251 | $ 301,984
Tier I (leverage) capital, excess, percent | 0.0318 | 0.0347
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 686,630 | $ 691,754
Common Equity Tier I risk-based capital, capital level, percent | 0.1022 | 0.1025
Common Equity Tier I risk-based capital, requirement to be well-capitalized, amount | $ 436,707 | $ 438,770
Common Equity Tier I risk-based capital, requirement to be well-capitalized, percent | 0.065% | 0.065%
Common Equity Tier I risk-based capital, excess, amount | $ 249,923 | $ 252,984
Common Equity Tier I risk-based capital, excess, percent | 0.0372% | 0.0375%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 733,308 | $ 737,732
Tier I risk-based capital, capital level, percent | 0.1091 | 0.1093
Tier I risk-based capital, requirement to be well-capitalized, amount | $ 537,485 | $ 540,024
Tier I risk-based capital, requirement to be well-capitalized, percent | 0.0800 | 0.0800
Tier I risk-based capital, excess, amount | $ 195,823 | $ 197,708
Tier I risk-based capital, excess, percent | 0.0291 | 0.0293
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 965,819 | $ 967,627
Total risk-based capital, capital level, percent | 0.1438 | 0.1433
Total risk-based capital, requirement to be well-capitalized, amount | $ 671,857 | $ 675,030
Total risk-based capital, requirement to be well-capitalized, percent | 0.1000 | 0.1000
Total risk-based capital, excess, amount | $ 293,962 | $ 292,597
Total risk-based capital, excess, percent | 0.0438 | 0.0433

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