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Regulatory Capital - Summary of the Bank's Compliance (Details) $ in Thousands | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Savings Bank [Member] |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 848,887 | $ 825,104
Tier I (leverage) capital, capital level, percent | 0.0912 | 0.0947
Tier I (leverage) capital, requirement to be well-capitalized, amount | $ 465,533 | $ 435,792
Tier I (leverage) capital, requirement to be well-capitalized, percent | 0.0500 | 0.0500
Tier I (leverage) capital, excess, amount | $ 383,354 | $ 389,312
Tier I (leverage) capital, excess, percent | 0.0412 | 0.0447
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 848,887 | $ 825,104
Common Equity Tier I risk-based capital, capital level, percent | 0.1250 | 0.1222
Common Equity Tier I risk-based capital, requirement to be well-capitalized, amount | $ 441,458 | $ 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 | $ 407,429 | $ 386,226
Common Equity Tier I risk-based capital, excess, percent | 0.06% | 0.0572%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 848,887 | $ 825,104
Tier I risk-based capital, capital level, percent | 0.1250 | 0.1222
Tier I risk-based capital, requirement to be well-capitalized, amount | $ 543,332 | $ 540,157
Tier I risk-based capital, requirement to be well-capitalized, percent | 0.0800 | 0.0800
Tier I risk-based capital, excess, amount | $ 305,555 | $ 284,947
Tier I risk-based capital, excess, percent | 0.0450 | 0.0422
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 890,145 | $ 864,999
Total risk-based capital, capital level, percent | 0.1311 | 0.1281
Total risk-based capital, requirement to be well-capitalized, amount | $ 679,166 | $ 675,196
Total risk-based capital, requirement to be well-capitalized, percent | 0.1000 | 0.1000
Total risk-based capital, excess, amount | $ 210,979 | $ 189,803
Total risk-based capital, excess, percent | 0.0311 | 0.0281
Holding Company |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 735,984 | $ 737,732
Tier I (leverage) capital, capital level, percent | 0.0791 | 0.0847
Tier I (leverage) capital, requirement to be well-capitalized, amount | $ 465,509 | $ 435,748
Tier I (leverage) capital, requirement to be well-capitalized, percent | 0.0500 | 0.0500
Tier I (leverage) capital, excess, amount | $ 270,475 | $ 301,984
Tier I (leverage) capital, excess, percent | 0.0291 | 0.0347
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 689,902 | $ 691,754
Common Equity Tier I risk-based capital, capital level, percent | 0.1016 | 0.1025
Common Equity Tier I risk-based capital, requirement to be well-capitalized, amount | $ 441,366 | $ 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 | $ 248,536 | $ 252,984
Common Equity Tier I risk-based capital, excess, percent | 0.0366% | 0.0375%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 735,984 | $ 737,732
Tier I risk-based capital, capital level, percent | 0.1084 | 0.1093
Tier I risk-based capital, requirement to be well-capitalized, amount | $ 543,220 | $ 540,024
Tier I risk-based capital, requirement to be well-capitalized, percent | 0.0800 | 0.0800
Tier I risk-based capital, excess, amount | $ 192,764 | $ 197,708
Tier I risk-based capital, excess, percent | 0.0284 | 0.0293
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 967,242 | $ 967,627
Total risk-based capital, capital level, percent | 0.1424 | 0.1433
Total risk-based capital, requirement to be well-capitalized, amount | $ 679,025 | $ 675,030
Total risk-based capital, requirement to be well-capitalized, percent | 0.1000 | 0.1000
Total risk-based capital, excess, amount | $ 288,217 | $ 292,597
Total risk-based capital, excess, percent | 0.0424 | 0.0433

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