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Loans, net and allowance for credit losses - Allocation of Allowance for Loan Losses and Related Loans by Major Classification of Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Allowance for loan losses:            
Ending balance $ 23,010 $ 23,218 $ 27,472 $ 29,822 $ 29,374 $ 28,383
Ending balance     27,472      
Ending balance: individually evaluated for impairment     40      
Ending balance: individually evaluated for impairment 42          
Ending balance: collectively evaluated for impairment     27,432      
Ending balance: collectively evaluated for impairment 22,968          
Loans receivable:            
Loans 2,870,969          
Ending balance     2,730,116      
Ending balance: individually evaluated for impairment     3,921      
Ending balance: collectively evaluated for impairment 2,867,474   2,726,195      
Real estate            
Loans receivable:            
Ending balance: individually evaluated for impairment 3,453          
Non-real estate            
Loans receivable:            
Ending balance: individually evaluated for impairment 42          
Commercial            
Allowance for loan losses:            
Ending balance 2,251 2,751 4,365 6,520 6,522 7,466
Ending balance     4,365      
Ending balance: individually evaluated for impairment     19      
Ending balance: individually evaluated for impairment 42          
Ending balance: collectively evaluated for impairment     4,346      
Ending balance: collectively evaluated for impairment 2,209          
Loans receivable:            
Loans 404,245          
Ending balance     433,048      
Ending balance: individually evaluated for impairment     98      
Ending balance: collectively evaluated for impairment 404,142   432,950      
Commercial | Real estate            
Loans receivable:            
Ending balance: individually evaluated for impairment 61          
Commercial | Non-real estate            
Loans receivable:            
Ending balance: individually evaluated for impairment 42          
Municipal            
Allowance for loan losses:            
Ending balance 867 827 1,247 1,251 1,244 987
Ending balance     1,247      
Ending balance: collectively evaluated for impairment     1,247      
Ending balance: collectively evaluated for impairment 867          
Loans receivable:            
Loans 176,935          
Ending balance     166,210      
Ending balance: collectively evaluated for impairment 176,935   166,210      
Commercial real estate            
Allowance for loan losses:            
Ending balance 15,095 14,961 17,915 18,023 17,569 15,928
Ending balance     17,915      
Ending balance: collectively evaluated for impairment     17,915      
Ending balance: collectively evaluated for impairment 15,095          
Loans receivable:            
Loans 1,846,350          
Ending balance     1,709,827      
Ending balance: individually evaluated for impairment     2,063      
Ending balance: collectively evaluated for impairment 1,844,285   1,707,764      
Commercial real estate | Real estate            
Loans receivable:            
Ending balance: individually evaluated for impairment 2,065          
Residential real estate            
Allowance for loan losses:            
Ending balance 3,898 3,767 3,072 3,230 3,220 3,209
Ending balance     3,072      
Ending balance: individually evaluated for impairment     21      
Ending balance: collectively evaluated for impairment     3,051      
Ending balance: collectively evaluated for impairment 3,898          
Loans receivable:            
Loans 357,647          
Ending balance     330,728      
Ending balance: individually evaluated for impairment     1,760      
Ending balance: collectively evaluated for impairment 356,320   328,968      
Residential real estate | Real estate            
Loans receivable:            
Ending balance: individually evaluated for impairment 1,327          
Consumer            
Allowance for loan losses:            
Ending balance 899 $ 912 873 $ 798 $ 819 $ 793
Ending balance     873      
Ending balance: collectively evaluated for impairment     873      
Ending balance: collectively evaluated for impairment 899          
Loans receivable:            
Loans 85,792          
Ending balance     90,303      
Ending balance: collectively evaluated for impairment $ 85,792   $ 90,303