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Regulatory Capital - Summary of the Bank's Compliance (Details)
$ in Thousands
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Savings Bank [Member]    
Tier I (leverage) capital:    
Tier I (leverage) capital, capital level, amount $ 838,042 $ 825,104
Tier I (leverage) capital, capital level, percent 0.0935 0.0947
Tier I (leverage) capital, requirement to be well-capitalized, amount $ 448,089 $ 435,792
Tier I (leverage) capital, requirement to be well-capitalized, percent 0.0500 0.0500
Tier I (leverage) capital, excess, amount $ 389,953 $ 389,312
Tier I (leverage) capital, excess, percent 0.0435 0.0447
Common Equity Tier I risk-based capital:    
Common Equity Tier I risk-based capital, capital level, amount $ 838,042 $ 825,104
Common Equity Tier I risk-based capital, capital level, percent 0.1247 0.1222
Common Equity Tier I risk-based capital, requirement to be well-capitalized, amount $ 436,783 $ 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 $ 401,259 $ 386,226
Common Equity Tier I risk-based capital, excess, percent 0.0597% 0.0572%
Tier I risk-based capital:    
Tier I risk-based capital, capital level, amount $ 838,042 $ 825,104
Tier I risk-based capital, capital level, percent 0.1247 0.1222
Tier I risk-based capital, requirement to be well-capitalized, amount $ 537,579 $ 540,157
Tier I risk-based capital, requirement to be well-capitalized, percent 0.0800 0.0800
Tier I risk-based capital, excess, amount $ 300,463 $ 284,947
Tier I risk-based capital, excess, percent 0.0447 0.0422
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 880,553 $ 864,999
Total risk-based capital, capital level, percent 0.1310 0.1281
Total risk-based capital, requirement to be well-capitalized, amount $ 671,974 $ 675,196
Total risk-based capital, requirement to be well-capitalized, percent 0.1000 0.1000
Total risk-based capital, excess, amount $ 208,579 $ 189,803
Total risk-based capital, excess, percent 0.0310 0.0281
Holding Company    
Tier I (leverage) capital:    
Tier I (leverage) capital, capital level, amount $ 733,308 $ 737,732
Tier I (leverage) capital, capital level, percent 0.0818 0.0847
Tier I (leverage) capital, requirement to be well-capitalized, amount $ 448,057 $ 435,748
Tier I (leverage) capital, requirement to be well-capitalized, percent 0.0500 0.0500
Tier I (leverage) capital, excess, amount $ 285,251 $ 301,984
Tier I (leverage) capital, excess, percent 0.0318 0.0347
Common Equity Tier I risk-based capital:    
Common Equity Tier I risk-based capital, capital level, amount $ 686,630 $ 691,754
Common Equity Tier I risk-based capital, capital level, percent 0.1022 0.1025
Common Equity Tier I risk-based capital, requirement to be well-capitalized, amount $ 436,707 $ 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 $ 249,923 $ 252,984
Common Equity Tier I risk-based capital, excess, percent 0.0372% 0.0375%
Tier I risk-based capital:    
Tier I risk-based capital, capital level, amount $ 733,308 $ 737,732
Tier I risk-based capital, capital level, percent 0.1091 0.1093
Tier I risk-based capital, requirement to be well-capitalized, amount $ 537,485 $ 540,024
Tier I risk-based capital, requirement to be well-capitalized, percent 0.0800 0.0800
Tier I risk-based capital, excess, amount $ 195,823 $ 197,708
Tier I risk-based capital, excess, percent 0.0291 0.0293
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 965,819 $ 967,627
Total risk-based capital, capital level, percent 0.1438 0.1433
Total risk-based capital, requirement to be well-capitalized, amount $ 671,857 $ 675,030
Total risk-based capital, requirement to be well-capitalized, percent 0.1000 0.1000
Total risk-based capital, excess, amount $ 293,962 $ 292,597
Total risk-based capital, excess, percent 0.0438 0.0433