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Loans Receivable, Allowance for Credit Losses and Credit Quality - Loans Receivable by Internal Risk Grade by Year of Origination (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Term Loans Amortized Cost Basis by Origination Year          
2025 / 2024 $ 408,830 $ 492,728   $ 408,830  
2024 / 2023 504,699 943,600   504,699  
2023 / 2022 912,500 1,057,604   912,500  
2022 / 2021 975,329 446,009   975,329  
2021 / 2020 421,230 275,740   421,230  
Prior 781,927 568,097   781,927  
Revolving Loans 718,436 555,690   718,436  
Total 4,722,951 4,339,468   4,722,951  
Incurred Loss Model - Nonaccrual Loans 0   $ 0 0 $ 0
Current period gross charge-offs          
2024 / 2023 22 136      
2023 / 2022 11 388      
2022 / 2021 365 165      
2021 / 2020 214 100      
Prior 51 45      
Revolving Loans 30 10      
Total 693 844 5,305 3,441 8,191
Pass          
Term Loans Amortized Cost Basis by Origination Year          
2025 / 2024 356,959 425,299   356,959  
2024 / 2023 450,484 911,367   450,484  
2023 / 2022 803,521 988,187   803,521  
2022 / 2021 855,053 390,953   855,053  
2021 / 2020 367,766 264,475   367,766  
Prior 745,168 537,982   745,168  
Revolving Loans 707,034 547,216   707,034  
Total 4,285,985 4,065,479   4,285,985  
Special Mention          
Term Loans Amortized Cost Basis by Origination Year          
2023 / 2022 81,743 1,930   81,743  
2022 / 2021 62,452 5,548   62,452  
2021 / 2020 7,070 1,875   7,070  
Prior 4,961 3,220   4,961  
Revolving Loans 2,367 425   2,367  
Total 158,593 12,998   158,593  
Substandard          
Term Loans Amortized Cost Basis by Origination Year          
2023 / 2022 11 469   11  
2022 / 2021 1,740 246   1,740  
2021 / 2020 254 343   254  
Prior 7,177 9,740   7,177  
Revolving Loans 5,922 5,625   5,922  
Total 15,104 16,423   15,104  
Doubtful          
Term Loans Amortized Cost Basis by Origination Year          
Prior 10 10   10  
Total 10 10   10  
Not Formally Risk Related          
Term Loans Amortized Cost Basis by Origination Year          
2025 / 2024 51,871 67,429   51,871  
2024 / 2023 54,215 32,233   54,215  
2023 / 2022 27,225 67,018   27,225  
2022 / 2021 56,084 49,262   56,084  
2021 / 2020 46,140 9,047   46,140  
Prior 24,611 17,145   24,611  
Revolving Loans 3,113 2,424   3,113  
Total 263,259 244,558   263,259  
Residential real estate          
Term Loans Amortized Cost Basis by Origination Year          
Total 1,272,835 1,254,832   1,272,835  
Residential real estate | One to four-family residential          
Term Loans Amortized Cost Basis by Origination Year          
2025 / 2024 68,875 97,895   68,875  
2024 / 2023 101,033 145,711   101,033  
2023 / 2022 138,257 266,364   138,257  
2022 / 2021 252,612 248,045   252,612  
2021 / 2020 231,320 115,133   231,320  
Prior 307,731 227,344   307,731  
Revolving Loans 34,028 30,299   34,028  
Total 1,133,856 1,130,791   1,133,856  
Residential real estate | One to four-family residential | Pass          
Term Loans Amortized Cost Basis by Origination Year          
2025 / 2024 68,875 97,895   68,875  
2024 / 2023 101,033 145,711   101,033  
2023 / 2022 138,257 266,364   138,257  
2022 / 2021 252,612 247,799   252,612  
2021 / 2020 231,078 115,133   231,078  
Prior 305,439 224,354   305,439  
Revolving Loans 33,790 30,227   33,790  
Total 1,131,084 1,127,483   1,131,084  
Residential real estate | One to four-family residential | Substandard          
Term Loans Amortized Cost Basis by Origination Year          
2022 / 2021   246      
2021 / 2020 242     242  
Prior 2,292 2,990   2,292  
Revolving Loans 238 72   238  
Total 2,772 3,308   2,772  
Residential real estate | Home Equity          
Term Loans Amortized Cost Basis by Origination Year          
2023 / 2022 245     245  
Revolving Loans 138,734 124,041   138,734  
Total 138,979 124,041   138,979  
Residential real estate | Home Equity | Pass          
Term Loans Amortized Cost Basis by Origination Year          
2023 / 2022 245     245  
Revolving Loans 137,562 123,083   137,562  
Total 137,807 123,083   137,807  
Residential real estate | Home Equity | Substandard          
Term Loans Amortized Cost Basis by Origination Year          
Revolving Loans 1,172 958   1,172  
Total 1,172 958   1,172  
Residential real estate | Commercial          
Term Loans Amortized Cost Basis by Origination Year          
2025 / 2024 181,156 118,115   181,156  
2024 / 2023 109,979 409,048   109,979  
2023 / 2022 352,415 366,252   352,415  
2022 / 2021 328,413 72,013   328,413  
2021 / 2020 69,885 98,373   69,885  
Prior 339,539 254,505   339,539  
Revolving Loans 68,288 45,088   68,288  
Total 1,449,675 1,363,394   1,449,675  
Current period gross charge-offs          
Total     4,000   4,000
Residential real estate | Commercial | Pass          
Term Loans Amortized Cost Basis by Origination Year          
2025 / 2024 181,156 118,115   181,156  
2024 / 2023 109,979 409,048   109,979  
2023 / 2022 270,672 364,384   270,672  
2022 / 2021 278,879 69,349   278,879  
2021 / 2020 65,442 97,500   65,442  
Prior 335,176 248,749   335,176  
Revolving Loans 66,546 45,088   66,546  
Total 1,307,850 1,352,233   1,307,850  
Residential real estate | Commercial | Special Mention          
Term Loans Amortized Cost Basis by Origination Year          
2023 / 2022 81,743 1,399   81,743  
2022 / 2021 47,917 2,664   47,917  
2021 / 2020 4,443 873   4,443  
Prior 4,015 3,220   4,015  
Revolving Loans 1,742     1,742  
Total 139,860 8,156   139,860  
Residential real estate | Commercial | Substandard          
Term Loans Amortized Cost Basis by Origination Year          
2023 / 2022   469      
2022 / 2021 1,617     1,617  
Prior 348 2,536   348  
Total 1,965 3,005   1,965  
Residential real estate | Multi-family residential          
Term Loans Amortized Cost Basis by Origination Year          
2025 / 2024 17,538 5,138   17,538  
2024 / 2023 6,083 7,563   6,083  
2023 / 2022 72,966 212,492   72,966  
2022 / 2021 227,584 21,791   227,584  
2021 / 2020 18,270 36,016   18,270  
Prior 83,784 50,047   83,784  
Revolving Loans 4,203     4,203  
Total 430,428 333,047   430,428  
Residential real estate | Multi-family residential | Pass          
Term Loans Amortized Cost Basis by Origination Year          
2025 / 2024 17,538 5,138   17,538  
2024 / 2023 6,083 7,563   6,083  
2023 / 2022 72,966 212,492   72,966  
2022 / 2021 227,584 21,791   227,584  
2021 / 2020 18,270 36,016   18,270  
Prior 83,784 50,047   83,784  
Revolving Loans 4,203     4,203  
Total 430,428 333,047   430,428  
Residential real estate | Construction & Land Development          
Term Loans Amortized Cost Basis by Origination Year          
2025 / 2024 51,715 161,997   51,715  
2024 / 2023 195,481 284,102   195,481  
2023 / 2022 259,138 90,512   259,138  
2022 / 2021 50,405 13,255   50,405  
2021 / 2020 16,143 9,232   16,143  
Prior 1,336 374   1,336  
Revolving Loans 80,805 24,337   80,805  
Total 655,023 583,809   655,023  
Residential real estate | Construction & Land Development | Pass          
Term Loans Amortized Cost Basis by Origination Year          
2025 / 2024 51,715 161,997   51,715  
2024 / 2023 195,481 284,102   195,481  
2023 / 2022 259,138 90,512   259,138  
2022 / 2021 38,822 13,255   38,822  
2021 / 2020 16,143 9,232   16,143  
Prior 1,326 364   1,326  
Revolving Loans 80,805 24,337   80,805  
Total 643,430 583,799   643,430  
Residential real estate | Construction & Land Development | Special Mention          
Term Loans Amortized Cost Basis by Origination Year          
2022 / 2021 11,583     11,583  
Total 11,583     11,583  
Residential real estate | Construction & Land Development | Doubtful          
Term Loans Amortized Cost Basis by Origination Year          
Prior 10 10   10  
Total 10 10   10  
Commercial          
Term Loans Amortized Cost Basis by Origination Year          
Total 3,186,857 2,840,078   3,186,857  
Commercial | Construction & Land Development          
Term Loans Amortized Cost Basis by Origination Year          
Total 655,023 583,809   655,023  
Commercial | Commercial and industrial          
Term Loans Amortized Cost Basis by Origination Year          
2025 / 2024 37,675 42,154   37,675  
2024 / 2023 37,908 64,943   37,908  
2023 / 2022 62,254 54,966   62,254  
2022 / 2021 60,231 41,643   60,231  
2021 / 2020 39,472 7,939   39,472  
Prior 24,926 18,682   24,926  
Revolving Loans 389,265 329,501   389,265  
Total 651,731 559,828   651,731  
Current period gross charge-offs          
Total         391
Commercial | Commercial and industrial | Pass          
Term Loans Amortized Cost Basis by Origination Year          
2025 / 2024 37,675 42,154   37,675  
2024 / 2023 37,908 64,943   37,908  
2023 / 2022 62,243 54,435   62,243  
2022 / 2021 57,156 38,759   57,156  
2021 / 2020 36,833 6,594   36,833  
Prior 19,443 14,468   19,443  
Revolving Loans 384,128 324,481   384,128  
Total 635,386 545,834   635,386  
Commercial | Commercial and industrial | Special Mention          
Term Loans Amortized Cost Basis by Origination Year          
2023 / 2022   531      
2022 / 2021 2,952 2,884   2,952  
2021 / 2020 2,627 1,002   2,627  
Prior 946     946  
Revolving Loans 625 425   625  
Total 7,150 4,842   7,150  
Commercial | Commercial and industrial | Substandard          
Term Loans Amortized Cost Basis by Origination Year          
2023 / 2022 11     11  
2022 / 2021 123     123  
2021 / 2020 12 343   12  
Prior 4,537 4,214   4,537  
Revolving Loans 4,512 4,595   4,512  
Total 9,195 9,152   9,195  
Consumer          
Term Loans Amortized Cost Basis by Origination Year          
2025 / 2024 51,871 67,429   51,871  
2024 / 2023 54,215 32,233   54,215  
2023 / 2022 27,225 67,018   27,225  
2022 / 2021 56,084 49,262   56,084  
2021 / 2020 46,140 9,047   46,140  
Prior 24,611 17,145   24,611  
Revolving Loans 3,113 2,424   3,113  
Total 263,259 244,558   263,259  
Incurred Loss Model - Nonaccrual Loans 2,100 2,400   2,100  
Current period gross charge-offs          
2024 / 2023 22 136      
2023 / 2022 11 388      
2022 / 2021 365 165      
2021 / 2020 214 100      
Prior 51 45      
Revolving Loans 30 10      
Total 693 844 $ 1,305 3,441 $ 3,800
Consumer | Not Formally Risk Related          
Term Loans Amortized Cost Basis by Origination Year          
2025 / 2024 51,871 67,429   51,871  
2024 / 2023 54,215 32,233   54,215  
2023 / 2022 27,225 67,018   27,225  
2022 / 2021 56,084 49,262   56,084  
2021 / 2020 46,140 9,047   46,140  
Prior 24,611 17,145   24,611  
Revolving Loans 3,113 2,424   3,113  
Total $ 263,259 $ 244,558   $ 263,259