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Loans - Summary of balance in allowance for loan losses and recorded investment in loans by class and based on impairment method (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Ending allowance balance attributable to loans:            
Individually evaluated for impairment $ 0   $ 0      
Collectively evaluated for impairment 6,741   5,629      
Total ending allowance balance 6,741 $ 6,433 5,629 $ 5,229 $ 4,789 $ 4,264
Loans:            
Loans individually evaluated for impairment 1,076   0      
Loans collectively evaluated for impairment 532,354   467,149      
Total ending loans balance 533,430   467,149      
Real Estate | 1 - 4 Family Residential            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 356   407      
Total ending allowance balance 356 372 407 419 425 382
Loans:            
Loans individually evaluated for impairment 0   0      
Loans collectively evaluated for impairment 49,214   56,043      
Total ending loans balance 49,214   56,043      
Real Estate | Multifamily            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 939   952      
Total ending allowance balance 939 920 952 911 826 713
Loans:            
Loans individually evaluated for impairment 0   0      
Loans collectively evaluated for impairment 136,799   136,537      
Total ending loans balance 136,799   136,537      
Real Estate | Commercial Real Estate            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 529   357      
Total ending allowance balance 529 406 357 379 345 266
Loans:            
Loans individually evaluated for impairment 0   0      
Loans collectively evaluated for impairment 49,125   33,145      
Total ending loans balance 49,125   33,145      
Real Estate | Construction            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 162   149      
Total ending allowance balance 162 161 149 142 168 127
Loans:            
Loans individually evaluated for impairment 0   0      
Loans collectively evaluated for impairment 6,450   5,921      
Total ending loans balance 6,450   5,921      
Commercial            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 4,073   3,110      
Total ending allowance balance 4,073 3,843 3,110 2,821 2,518 2,272
Loans:            
Loans individually evaluated for impairment 0   0      
Loans collectively evaluated for impairment 247,931   191,828      
Total ending loans balance 247,931   191,828      
Consumer            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 682   654      
Total ending allowance balance 682 $ 731 654 $ 557 $ 507 $ 504
Loans:            
Loans individually evaluated for impairment 1,076   0      
Loans collectively evaluated for impairment 42,835   43,675      
Total ending loans balance $ 43,911   $ 43,675