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Regulatory Capital - Summary of the Bank's Compliance (Details) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Savings Bank [Member] |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 847,588 | $ 825,104
Tier I (leverage) capital, capital level, percent | 0.0931 | 0.0947
Tier I (leverage) capital, requirement to be well-capitalized, amount | $ 455,335 | $ 435,792
Tier I (leverage) capital, requirement to be well-capitalized, percent | 0.05 | 0.05
Tier I (leverage) capital, excess, amount | $ 392,253 | $ 389,312
Tier I (leverage) capital, excess, percent | 0.0431 | 0.0447
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 847,588 | $ 825,104
Common Equity Tier I risk-based capital, capital level, percent | 0.1251 | 0.1222
Common Equity Tier I risk-based capital, requirement to be well-capitalized, amount | $ 440,259 | $ 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 | $ 407,329 | $ 386,226
Common Equity Tier I risk-based capital, excess, percent | 0.0601% | 0.0572%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 847,588 | $ 825,104
Tier I risk-based capital, capital level, percent | 0.1251 | 0.1222
Tier I risk-based capital, requirement to be well-capitalized, amount | $ 541,857 | $ 540,157
Tier I risk-based capital, requirement to be well-capitalized, percent | 0.08 | 0.08
Tier I risk-based capital, excess, amount | $ 305,731 | $ 284,947
Tier I risk-based capital, excess, percent | 0.0451 | 0.0422
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 887,902 | $ 864,999
Total risk-based capital, capital level, percent | 0.1311 | 0.1281
Total risk-based capital, requirement to be well-capitalized, amount | $ 677,321 | $ 675,196
Total risk-based capital, requirement to be well-capitalized, percent | 0.10 | 0.10
Total risk-based capital, excess, amount | $ 210,581 | $ 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 | $ 731,958 | $ 737,732
Tier I (leverage) capital, capital level, percent | 0.0804 | 0.0847
Tier I (leverage) capital, requirement to be well-capitalized, amount | $ 455,297 | $ 435,748
Tier I (leverage) capital, requirement to be well-capitalized, percent | 0.05 | 0.05
Tier I (leverage) capital, excess, amount | $ 276,661 | $ 301,984
Tier I (leverage) capital, excess, percent | 0.0304 | 0.0347
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 685,004 | $ 691,754
Common Equity Tier I risk-based capital, capital level, percent | 0.1013 | 0.1025
Common Equity Tier I risk-based capital, requirement to be well-capitalized, amount | $ 439,533 | $ 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 | $ 245,471 | $ 252,984
Common Equity Tier I risk-based capital, excess, percent | 0.0363% | 0.0375%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 731,958 | $ 737,732
Tier I risk-based capital, capital level, percent | 0.1082 | 0.1093
Tier I risk-based capital, requirement to be well-capitalized, amount | $ 540,964 | $ 540,024
Tier I risk-based capital, requirement to be well-capitalized, percent | 0.08 | 0.08
Tier I risk-based capital, excess, amount | $ 190,994 | $ 197,708
Tier I risk-based capital, excess, percent | 0.0282 | 0.0293
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 962,272 | $ 967,627
Total risk-based capital, capital level, percent | 0.1423 | 0.1433
Total risk-based capital, requirement to be well-capitalized, amount | $ 676,205 | $ 675,030
Total risk-based capital, requirement to be well-capitalized, percent | 0.10 | 0.10
Total risk-based capital, excess, amount | $ 286,067 | $ 292,597
Total risk-based capital, excess, percent | 0.0423 | 0.0433

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