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Loans Receivable and Allowance for Credit Losses - Composition of Allowance for Loan Losses and Related Recorded Investment in Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Financing Receivable Allowance For Credit Losses [Line Items]            
Balance, beginning of period $ 28,173 $ 17,535 $ 34,592 $ 34,592 $ 16,352 $ 16,352
Provision (benefit) charged to expense 750 9,330   1,363 11,405 24,046
Impact of CECL adoption       (3,090)    
Charge-offs (1,592) (1,799)   (6,092) (3,000) (6,660)
Recoveries 83 42   641 351 854
Balance, end of period 27,414 25,108 28,173 27,414 25,108 34,592
Ending balance: individually evaluated for impairment 275 205   275 205 196
Ending balance: collectively evaluated for impairment 27,139 24,903   27,139 24,903 34,396
Ending balance: individually evaluated for impairment 9,396 25,398   9,396 25,398 17,952
Ending balance: collectively evaluated for impairment 1,804,933 1,389,975   1,804,933 1,389,975 1,507,716
Total 1,814,329 1,415,373   1,814,329 1,415,373 1,525,668
1-4 Family Investor Owned            
Financing Receivable Allowance For Credit Losses [Line Items]            
Balance, beginning of period 4,776 3,607 3,863 3,863 3,540 3,540
Provision (benefit) charged to expense 114 (114)   33 (25) 167
Impact of CECL adoption       766    
Recoveries         156 156
Balance, end of period 4,662 3,721 4,776 4,662 3,721 3,863
Ending balance: individually evaluated for impairment   69     69 63
Ending balance: collectively evaluated for impairment 4,662 3,652   4,662 3,652 3,800
Ending balance: individually evaluated for impairment 396 8,352   396 8,352 5,269
Ending balance: collectively evaluated for impairment 346,686 328,315   346,686 328,315 338,699
Total 347,082 336,667   347,082 336,667 343,968
1-4 Family Owner-Occupied            
Financing Receivable Allowance For Credit Losses [Line Items]            
Balance, beginning of period 2,152 1,233 1,723 1,723 1,178 1,178
Provision (benefit) charged to expense 26 159   257 214 506
Impact of CECL adoption       146    
Recoveries   39     39 39
Balance, end of period 2,126 1,431 2,152 2,126 1,431 1,723
Ending balance: individually evaluated for impairment 71 99   71 99 96
Ending balance: collectively evaluated for impairment 2,055 1,332   2,055 1,332 1,627
Ending balance: individually evaluated for impairment 2,134 4,440   2,134 4,440 4,315
Ending balance: collectively evaluated for impairment 149,732 108,309   149,732 108,309 130,563
Total 151,866 112,749   151,866 112,749 134,878
Multifamily            
Financing Receivable Allowance For Credit Losses [Line Items]            
Balance, beginning of period 4,738 6,374 8,021 8,021 5,684 5,684
Provision (benefit) charged to expense 26 374   653 1,064 2,337
Impact of CECL adoption     (3,962)      
Balance, end of period 4,712 6,748 4,738 4,712 6,748 8,021
Ending balance: collectively evaluated for impairment 4,712 6,748   4,712 6,748 8,021
Ending balance: collectively evaluated for impairment 553,694 421,917   553,694 421,917 494,667
Total 553,694 421,917   553,694 421,917 494,667
Nonresidential            
Financing Receivable Allowance For Credit Losses [Line Items]            
Balance, beginning of period 3,238 2,493 2,724 2,724 2,165 2,165
Provision (benefit) charged to expense (44) 32   (20) 296 559
Impact of CECL adoption       578    
Balance, end of period 3,282 2,461 3,238 3,282 2,461 2,724
Ending balance: individually evaluated for impairment   37     37 37
Ending balance: collectively evaluated for impairment 3,282 2,424   3,282 2,424 2,687
Ending balance: individually evaluated for impairment   1,587     1,587 801
Ending balance: collectively evaluated for impairment 321,472 281,055   321,472 281,055 307,242
Total 321,472 282,642   321,472 282,642 308,043
Construction and Land            
Financing Receivable Allowance For Credit Losses [Line Items]            
Balance, beginning of period 3,189 2,262 2,683 2,683 2,024 2,024
Provision (benefit) charged to expense 859 564   2,276 802 659
Impact of CECL adoption       (911)    
Balance, end of period 4,048 2,826 3,189 4,048 2,826 2,683
Ending balance: collectively evaluated for impairment 4,048 2,826   4,048 2,826 2,683
Ending balance: individually evaluated for impairment 6,657 10,660   6,657 10,660 7,567
Ending balance: collectively evaluated for impairment 404,726 186,777   404,726 186,777 177,451
Total 411,383 197,437   411,383 197,437 185,018
Business Loans            
Financing Receivable Allowance For Credit Losses [Line Items]            
Balance, beginning of period 450 103 120 120 306 306
Provision (benefit) charged to expense 102 (61)   193 (235) (280)
Impact of CECL adoption       236    
Recoveries 3 1   3 94 94
Balance, end of period 552 165 450 552 165 120
Ending balance: individually evaluated for impairment 204     204    
Ending balance: collectively evaluated for impairment 348 165   348 165 120
Ending balance: individually evaluated for impairment 209 359   209 359  
Ending balance: collectively evaluated for impairment 18,207 41,039   18,207 41,039 39,965
Total 18,416 41,398   18,416 41,398 39,965
Consumer            
Financing Receivable Allowance For Credit Losses [Line Items]            
Balance, beginning of period 9,630 1,463 15,458 15,458 1,455 1,455
Provision (benefit) charged to expense (89) 8,090   (2,029) 9,239 20,098
Impact of CECL adoption       57    
Charge-offs (1,592) (1,799)   (6,092) (3,000) (6,660)
Recoveries 80 2   638 62 565
Balance, end of period 8,032 7,756 $ 9,630 8,032 7,756 15,458
Ending balance: collectively evaluated for impairment 8,032 7,756   8,032 7,756 15,458
Ending balance: collectively evaluated for impairment 10,416 22,563   10,416 22,563 19,129
Total $ 10,416 $ 22,563   $ 10,416 $ 22,563 $ 19,129