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Regulatory Capital - Summary of the Bank's Compliance (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
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