v3.25.2
Regulatory Capital - Summary of the Bank's Compliance (Details)
$ in Thousands
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Savings bank    
Tier I (leverage) capital:    
Tier I (leverage) capital, capital level, amount $ 875,604 $ 847,588
Tier I (leverage) capital, capital level, percent 0.0982 0.0931
Tier I (leverage) capital, requirement to be well-capitalized, amount $ 445,626 $ 455,335
Tier I (leverage) capital, requirement to be well-capitalized, percent 0.05 0.05
Tier I (leverage) capital, excess, amount $ 429,978 $ 392,253
Tier I (leverage) capital, excess, percent 0.0482 0.0431
Common Equity Tier I risk-based capital:    
Common Equity Tier I risk-based capital, capital level, amount $ 875,604 $ 847,588
Common Equity Tier I risk-based capital, capital level, percent 0.1311 0.1251
Common Equity Tier I risk-based capital, requirement to be well-capitalized, amount $ 433,982 $ 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 $ 441,622 $ 407,329
Common Equity Tier I risk-based capital, excess, percent 0.0661% 0.0601%
Tier I risk-based capital:    
Tier I risk-based capital, capital level, amount $ 875,604 $ 847,588
Tier I risk-based capital, capital level, percent 0.1311 0.1251
Tier I risk-based capital, requirement to be well-capitalized, amount $ 534,132 $ 541,857
Tier I risk-based capital, requirement to be well-capitalized, percent 0.08 0.08
Tier I risk-based capital, excess, amount $ 341,472 $ 305,731
Tier I risk-based capital, excess, percent 0.0511 0.0451
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 917,250 $ 887,902
Total risk-based capital, capital level, percent 0.1374 0.1311
Total risk-based capital, requirement to be well-capitalized, amount $ 667,665 $ 677,321
Total risk-based capital, requirement to be well-capitalized, percent 0.10 0.10
Total risk-based capital, excess, amount $ 249,585 $ 210,581
Total risk-based capital, excess, percent 0.0374 0.0311
Holding company    
Tier I (leverage) capital:    
Tier I (leverage) capital, capital level, amount $ 740,871 $ 731,958
Tier I (leverage) capital, capital level, percent 0.0831 0.0804
Tier I (leverage) capital, requirement to be well-capitalized, amount $ 445,628 $ 455,297
Tier I (leverage) capital, requirement to be well-capitalized, percent 0.05 0.05
Tier I (leverage) capital, excess, amount $ 295,243 $ 276,661
Tier I (leverage) capital, excess, percent 0.0331 0.0304
Common Equity Tier I risk-based capital:    
Common Equity Tier I risk-based capital, capital level, amount $ 695,099 $ 685,004
Common Equity Tier I risk-based capital, capital level, percent 0.1041 0.1013
Common Equity Tier I risk-based capital, requirement to be well-capitalized, amount $ 433,915 $ 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 $ 261,184 $ 245,471
Common Equity Tier I risk-based capital, excess, percent 0.0391% 0.0363%
Tier I risk-based capital:    
Tier I risk-based capital, capital level, amount $ 740,871 $ 731,958
Tier I risk-based capital, capital level, percent 0.111 0.1082
Tier I risk-based capital, requirement to be well-capitalized, amount $ 534,050 $ 540,964
Tier I risk-based capital, requirement to be well-capitalized, percent 0.08 0.08
Tier I risk-based capital, excess, amount $ 206,821 $ 190,994
Tier I risk-based capital, excess, percent 0.031 0.0282
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 972,517 $ 962,272
Total risk-based capital, capital level, percent 0.1457 0.1423
Total risk-based capital, requirement to be well-capitalized, amount $ 667,562 $ 676,205
Total risk-based capital, requirement to be well-capitalized, percent 0.10 0.10
Total risk-based capital, excess, amount $ 304,955 $ 286,067
Total risk-based capital, excess, percent 0.0457 0.0423