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Available-for-sale securities - Investment Securities in a Continuous Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months, Fair Value $ 9,984 $ 19,124
Less than 12 Months, Unrealized (Loss) (286) (1,107)
12 Months or Longer, Fair Value 79,203 63,632
Less than 12 Months, Unrealized (Loss) (20,583) (19,985)
Fair Value 89,187 82,756
Unrealized (Loss) (20,869) (21,092)
U. S. Government agency and mortgage-backed securities    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months, Fair Value 9,984 11,126
Less than 12 Months, Unrealized (Loss) (286) (633)
12 Months or Longer, Fair Value 55,687 47,920
Less than 12 Months, Unrealized (Loss) (14,543) (13,801)
Fair Value 65,671 59,046
Unrealized (Loss) (14,829) (14,434)
Corporate bonds    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months, Fair Value 0 1,959
Less than 12 Months, Unrealized (Loss) 0 (64)
12 Months or Longer, Fair Value 13,766 10,934
Less than 12 Months, Unrealized (Loss) (4,229) (5,061)
Fair Value 13,766 12,893
Unrealized (Loss) (4,229) (5,125)
Subordinated notes    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months, Fair Value 0 4,602
Less than 12 Months, Unrealized (Loss) 0 (398)
12 Months or Longer, Fair Value 4,227 0
Less than 12 Months, Unrealized (Loss) (773) 0
Fair Value 4,227 4,602
Unrealized (Loss) (773) (398)
SBA loan pools    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months, Fair Value 0 1,437
Less than 12 Months, Unrealized (Loss) 0 (12)
12 Months or Longer, Fair Value 5,037 4,280
Less than 12 Months, Unrealized (Loss) (965) (1,061)
Fair Value 5,037 5,717
Unrealized (Loss) (965) (1,073)
Municipal bonds    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months, Fair Value 0 0
Less than 12 Months, Unrealized (Loss) 0 0
12 Months or Longer, Fair Value 486 498
Less than 12 Months, Unrealized (Loss) (73) (62)
Fair Value 486 498
Unrealized (Loss) $ (73) $ (62)