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v3.25.1

Regulatory Capital - Summary of the Bank's Compliance (Details) $ in Thousands | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
--- | --- | ---
Savings Bank [Member] |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 856,082 | $ 847,588
Tier I (leverage) capital, capital level, percent | 0.0956 | 0.0931
Tier I (leverage) capital, requirement to be well-capitalized, amount | $ 447,823 | $ 455,335
Tier I (leverage) capital, requirement to be well-capitalized, percent | 0.05 | 0.05
Tier I (leverage) capital, excess, amount | $ 408,259 | $ 392,253
Tier I (leverage) capital, excess, percent | 0.0456 | 0.0431
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 856,082 | $ 847,588
Common Equity Tier I risk-based capital, capital level, percent | 0.1274 | 0.1251
Common Equity Tier I risk-based capital, requirement to be well-capitalized, amount | $ 436,787 | $ 440,259
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 | $ 419,295 | $ 407,329
Common Equity Tier I risk-based capital, excess, percent | 0.0624% | 0.0601%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 856,082 | $ 847,588
Tier I risk-based capital, capital level, percent | 0.1274 | 0.1251
Tier I risk-based capital, requirement to be well-capitalized, amount | $ 537,584 | $ 541,857
Tier I risk-based capital, requirement to be well-capitalized, percent | 0.08 | 0.08
Tier I risk-based capital, excess, amount | $ 318,498 | $ 305,731
Tier I risk-based capital, excess, percent | 0.0474 | 0.0451
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 896,836 | $ 887,902
Total risk-based capital, capital level, percent | 0.1335 | 0.1311
Total risk-based capital, requirement to be well-capitalized, amount | $ 671,980 | $ 677,321
Total risk-based capital, requirement to be well-capitalized, percent | 0.10 | 0.10
Total risk-based capital, excess, amount | $ 224,856 | $ 210,581
Total risk-based capital, excess, percent | 0.0335 | 0.0311
Holding Company |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 730,950 | $ 731,958
Tier I (leverage) capital, capital level, percent | 0.0812 | 0.0804
Tier I (leverage) capital, requirement to be well-capitalized, amount | $ 450,311 | $ 455,297
Tier I (leverage) capital, requirement to be well-capitalized, percent | 0.05 | 0.05
Tier I (leverage) capital, excess, amount | $ 280,639 | $ 276,661
Tier I (leverage) capital, excess, percent | 0.0312 | 0.0304
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 683,670 | $ 685,004
Common Equity Tier I risk-based capital, capital level, percent | 0.1017 | 0.1013
Common Equity Tier I risk-based capital, requirement to be well-capitalized, amount | $ 436,754 | $ 439,533
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 | $ 246,916 | $ 245,471
Common Equity Tier I risk-based capital, excess, percent | 0.0367% | 0.0363%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 730,950 | $ 731,958
Tier I risk-based capital, capital level, percent | 0.1088 | 0.1082
Tier I risk-based capital, requirement to be well-capitalized, amount | $ 537,543 | $ 540,964
Tier I risk-based capital, requirement to be well-capitalized, percent | 0.08 | 0.08
Tier I risk-based capital, excess, amount | $ 193,407 | $ 190,994
Tier I risk-based capital, excess, percent | 0.0288 | 0.0282
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 961,704 | $ 962,272
Total risk-based capital, capital level, percent | 0.1431 | 0.1423
Total risk-based capital, requirement to be well-capitalized, amount | $ 671,929 | $ 676,205
Total risk-based capital, requirement to be well-capitalized, percent | 0.10 | 0.10
Total risk-based capital, excess, amount | $ 289,775 | $ 286,067
Total risk-based capital, excess, percent | 0.0431 | 0.0423

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