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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