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Regulatory Capital - Summary of the Bank's Compliance (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Savings Bank [Member]    
Tier I (leverage) capital:    
Tier I (leverage) capital, capital level, amount $ 848,887 $ 825,104
Tier I (leverage) capital, capital level, percent 0.0912 0.0947
Tier I (leverage) capital, requirement to be well-capitalized, amount $ 465,533 $ 435,792
Tier I (leverage) capital, requirement to be well-capitalized, percent 0.0500 0.0500
Tier I (leverage) capital, excess, amount $ 383,354 $ 389,312
Tier I (leverage) capital, excess, percent 0.0412 0.0447
Common Equity Tier I risk-based capital:    
Common Equity Tier I risk-based capital, capital level, amount $ 848,887 $ 825,104
Common Equity Tier I risk-based capital, capital level, percent 0.1250 0.1222
Common Equity Tier I risk-based capital, requirement to be well-capitalized, amount $ 441,458 $ 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 $ 407,429 $ 386,226
Common Equity Tier I risk-based capital, excess, percent 0.06% 0.0572%
Tier I risk-based capital:    
Tier I risk-based capital, capital level, amount $ 848,887 $ 825,104
Tier I risk-based capital, capital level, percent 0.1250 0.1222
Tier I risk-based capital, requirement to be well-capitalized, amount $ 543,332 $ 540,157
Tier I risk-based capital, requirement to be well-capitalized, percent 0.0800 0.0800
Tier I risk-based capital, excess, amount $ 305,555 $ 284,947
Tier I risk-based capital, excess, percent 0.0450 0.0422
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 890,145 $ 864,999
Total risk-based capital, capital level, percent 0.1311 0.1281
Total risk-based capital, requirement to be well-capitalized, amount $ 679,166 $ 675,196
Total risk-based capital, requirement to be well-capitalized, percent 0.1000 0.1000
Total risk-based capital, excess, amount $ 210,979 $ 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 $ 735,984 $ 737,732
Tier I (leverage) capital, capital level, percent 0.0791 0.0847
Tier I (leverage) capital, requirement to be well-capitalized, amount $ 465,509 $ 435,748
Tier I (leverage) capital, requirement to be well-capitalized, percent 0.0500 0.0500
Tier I (leverage) capital, excess, amount $ 270,475 $ 301,984
Tier I (leverage) capital, excess, percent 0.0291 0.0347
Common Equity Tier I risk-based capital:    
Common Equity Tier I risk-based capital, capital level, amount $ 689,902 $ 691,754
Common Equity Tier I risk-based capital, capital level, percent 0.1016 0.1025
Common Equity Tier I risk-based capital, requirement to be well-capitalized, amount $ 441,366 $ 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 $ 248,536 $ 252,984
Common Equity Tier I risk-based capital, excess, percent 0.0366% 0.0375%
Tier I risk-based capital:    
Tier I risk-based capital, capital level, amount $ 735,984 $ 737,732
Tier I risk-based capital, capital level, percent 0.1084 0.1093
Tier I risk-based capital, requirement to be well-capitalized, amount $ 543,220 $ 540,024
Tier I risk-based capital, requirement to be well-capitalized, percent 0.0800 0.0800
Tier I risk-based capital, excess, amount $ 192,764 $ 197,708
Tier I risk-based capital, excess, percent 0.0284 0.0293
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 967,242 $ 967,627
Total risk-based capital, capital level, percent 0.1424 0.1433
Total risk-based capital, requirement to be well-capitalized, amount $ 679,025 $ 675,030
Total risk-based capital, requirement to be well-capitalized, percent 0.1000 0.1000
Total risk-based capital, excess, amount $ 288,217 $ 292,597
Total risk-based capital, excess, percent 0.0424 0.0433