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Regulatory Capital - Summary of the Bank's Compliance (Details) $ in Thousands | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Savings Bank [Member] |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 915,547 | $ 915,628
Tier I (leverage) capital, capital level, percent | 0.1058 | 0.1056
Tier I (leverage) capital, requirement to be well-capitalized, amount | $ 432,820 | $ 433,667
Tier I (leverage) capital, requirement to be well-capitalized, percent | 0.0500 | 0.0500
Tier I (leverage) capital, excess, amount | $ 482,727 | $ 481,961
Tier I (leverage) capital, excess, percent | 0.0558 | 0.0556
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 915,547 | $ 915,628
Common Equity Tier I risk-based capital, capital level, percent | 0.1345 | 0.1379
Common Equity Tier I risk-based capital, requirement to be well-capitalized, amount | $ 442,391 | $ 431,734
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 | $ 473,156 | $ 483,894
Common Equity Tier I risk-based capital, excess, percent | 0.0695% | 0.0729%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 915,547 | $ 915,628
Tier I risk-based capital, capital level, percent | 0.1345 | 0.1379
Tier I risk-based capital, requirement to be well-capitalized, amount | $ 544,482 | $ 531,365
Tier I risk-based capital, requirement to be well-capitalized, percent | 0.0800 | 0.0800
Tier I risk-based capital, excess, amount | $ 371,065 | $ 384,263
Tier I risk-based capital, excess, percent | 0.0545 | 0.0579
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 954,335 | $ 954,457
Total risk-based capital, capital level, percent | 0.1402 | 0.1437
Total risk-based capital, requirement to be well-capitalized, amount | $ 680,602 | $ 664,206
Total risk-based capital, requirement to be well-capitalized, percent | 0.1000 | 0.1000
Total risk-based capital, excess, amount | $ 273,733 | $ 290,251
Total risk-based capital, excess, percent | 0.0402 | 0.0437
Holding Company |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 736,744 | $ 746,880
Tier I (leverage) capital, capital level, percent | 0.0851 | 0.0861
Tier I (leverage) capital, requirement to be well-capitalized, amount | $ 432,763 | $ 433,607
Tier I (leverage) capital, requirement to be well-capitalized, percent | 0.0500 | 0.0500
Tier I (leverage) capital, excess, amount | $ 303,981 | $ 313,273
Tier I (leverage) capital, excess, percent | 0.0351 | 0.0361
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 690,294 | $ 698,258
Common Equity Tier I risk-based capital, capital level, percent | 0.1014 | 0.1052
Common Equity Tier I risk-based capital, requirement to be well-capitalized, amount | $ 442,291 | $ 431,635
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 | $ 248,003 | $ 266,623
Common Equity Tier I risk-based capital, excess, percent | 0.0364% | 0.0402%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 736,744 | $ 746,880
Tier I risk-based capital, capital level, percent | 0.1083 | 0.1125
Tier I risk-based capital, requirement to be well-capitalized, amount | $ 544,358 | $ 531,243
Tier I risk-based capital, requirement to be well-capitalized, percent | 0.0800 | 0.0800
Tier I risk-based capital, excess, amount | $ 192,386 | $ 215,637
Tier I risk-based capital, excess, percent | 0.0283 | 0.0325
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 965,532 | $ 975,709
Total risk-based capital, capital level, percent | 0.1419 | 0.1469
Total risk-based capital, requirement to be well-capitalized, amount | $ 680,448 | $ 664,054
Total risk-based capital, requirement to be well-capitalized, percent | 0.1000 | 0.1000
Total risk-based capital, excess, amount | $ 285,084 | $ 311,655
Total risk-based capital, excess, percent | 0.0419 | 0.0469

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