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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Jun. 30, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Available-for-sale Debt Securities    
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security 38 60
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 243 233
Total, Available-for-sale, Number of Securities in a Loss Position | security 281 293
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 72,332 $ 66,752
Available-for-sale Debt Securities, 12 Months or More, Fair Value 347,121 361,723
Available-for-sale Debt Securities, Total 419,453 428,475
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 698 1,175
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 42,447 49,250
Available-for-sale Debt Securities Unrealized losses, Total $ 43,145 $ 50,425
Held to Maturity, Debt Securities    
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position 3 4
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position 25 24
Total, Held to Maturity, Number of Securities in a Loss Position 28 28
Held-to-maturity Debt (HTM) Securities, Less than 12 Months $ 2,339 $ 2,508
Held-to-maturity Debt (HTM) Securities, 12 months or More 61,914 62,644
Held-to-maturity Debt (HTM) Securities, Total 64,253 65,152
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months 26 66
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 10,858 12,966
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 10,884 $ 13,032
U.S. Treasury securities    
Available-for-sale Debt Securities    
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 32 38
Total, Available-for-sale, Number of Securities in a Loss Position | security 32 38
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 145,181 $ 167,551
Available-for-sale Debt Securities, Total 145,181 167,551
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 5,389 8,751
Available-for-sale Debt Securities Unrealized losses, Total $ 5,389 $ 8,751
U.S. government-sponsored enterprises    
Available-for-sale Debt Securities    
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security   1
Total, Available-for-sale, Number of Securities in a Loss Position | security   1
Available-for-sale Debt Securities, 12 Months or More, Fair Value   $ 1,856
Available-for-sale Debt Securities, Total   1,856
Available-for-sale Debt Securities Unrealized losses, 12 Months or More   71
Available-for-sale Debt Securities Unrealized losses, Total   $ 71
U.S. government-sponsored enterprises, Tax-exempt    
Held to Maturity, Debt Securities    
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security 3  
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security 13  
Total, Held to Maturity, Number of Securities in a Loss Position | security 16  
Held-to-maturity Debt (HTM) Securities, Less than 12 Months $ 2,339  
Held-to-maturity Debt (HTM) Securities, 12 months or More 7,587  
Held-to-maturity Debt (HTM) Securities, Total 9,926  
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months 26  
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 877  
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 903  
State and municipals, Taxable    
Available-for-sale Debt Securities    
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security   2
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 64 64
Total, Available-for-sale, Number of Securities in a Loss Position | security 64 66
Available-for-sale Debt Securities, Less than 12 Months, Fair Value   $ 1,097
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 57,734 55,712
Available-for-sale Debt Securities, Total 57,734 56,809
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months   6
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 8,339 10,475
Available-for-sale Debt Securities Unrealized losses, Total $ 8,339 $ 10,481
State and municipals, Tax-exempt    
Available-for-sale Debt Securities    
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security 5 6
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 91 91
Total, Available-for-sale, Number of Securities in a Loss Position | security 96 97
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 3,893 $ 1,874
Available-for-sale Debt Securities, 12 Months or More, Fair Value 61,868 62,329
Available-for-sale Debt Securities, Total 65,761 64,203
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 23 41
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 10,798 10,239
Available-for-sale Debt Securities Unrealized losses, Total $ 10,821 $ 10,280
Held to Maturity, Debt Securities    
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security   4
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security   12
Total, Held to Maturity, Number of Securities in a Loss Position | security   16
Held-to-maturity Debt (HTM) Securities, Less than 12 Months   $ 2,508
Held-to-maturity Debt (HTM) Securities, 12 months or More   7,235
Held-to-maturity Debt (HTM) Securities, Total   9,743
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months   66
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More   1,037
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total   $ 1,103
Residential mortgage-backed securities, U.S. government agencies    
Available-for-sale Debt Securities    
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security 1 1
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 1 1
Total, Available-for-sale, Number of Securities in a Loss Position | security 2 2
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 6,349 $ 1,299
Available-for-sale Debt Securities, 12 Months or More, Fair Value 1 3
Available-for-sale Debt Securities, Total 6,350 1,302
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 11 27
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 1 1
Available-for-sale Debt Securities Unrealized losses, Total $ 12 $ 28
Held to Maturity, Debt Securities    
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security 4 4
Total, Held to Maturity, Number of Securities in a Loss Position | security 4 4
Held-to-maturity Debt (HTM) Securities, 12 months or More $ 10,917 $ 11,204
Held-to-maturity Debt (HTM) Securities, Total 10,917 11,204
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 2,152 2,643
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 2,152 $ 2,643
Residential mortgage-backed securities, U.S. government-sponsored enterprises    
Available-for-sale Debt Securities    
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security 14 29
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 41 31
Total, Available-for-sale, Number of Securities in a Loss Position | security 55 60
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 43,714 $ 40,886
Available-for-sale Debt Securities, 12 Months or More, Fair Value 67,327 68,732
Available-for-sale Debt Securities, Total 111,041 109,618
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 454 622
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 16,907 18,925
Available-for-sale Debt Securities Unrealized losses, Total $ 17,361 $ 19,547
Held to Maturity, Debt Securities    
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security 8 8
Total, Held to Maturity, Number of Securities in a Loss Position | security 8 8
Held-to-maturity Debt (HTM) Securities, 12 months or More $ 43,410 $ 44,205
Held-to-maturity Debt (HTM) Securities, Total 43,410 44,205
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 7,829 9,286
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 7,829 $ 9,286
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises    
Available-for-sale Debt Securities    
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 1  
Total, Available-for-sale, Number of Securities in a Loss Position | security 1  
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 1,880  
Available-for-sale Debt Securities, Total 1,880  
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 39  
Available-for-sale Debt Securities Unrealized losses, Total $ 39  
Private collateralized mortgage obligations    
Available-for-sale Debt Securities    
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security 15 15
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 1  
Total, Available-for-sale, Number of Securities in a Loss Position | security 16 15
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 13,336 $ 12,854
Available-for-sale Debt Securities, 12 Months or More, Fair Value 777  
Available-for-sale Debt Securities, Total 14,113 12,854
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 190 152
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 24  
Available-for-sale Debt Securities Unrealized losses, Total $ 214 $ 152
Asset backed securities    
Available-for-sale Debt Securities    
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security 3 2
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 3 1
Total, Available-for-sale, Number of Securities in a Loss Position | security 6 3
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 5,040 $ 2,659
Available-for-sale Debt Securities, 12 Months or More, Fair Value 4,402 1,939
Available-for-sale Debt Securities, Total 9,442 4,598
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 20 11
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 285 389
Available-for-sale Debt Securities Unrealized losses, Total $ 305 $ 400
Corporate debt securities    
Available-for-sale Debt Securities    
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security   5
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 9 6
Total, Available-for-sale, Number of Securities in a Loss Position | security 9 11
Available-for-sale Debt Securities, Less than 12 Months, Fair Value   $ 6,083
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 7,951 3,601
Available-for-sale Debt Securities, Total 7,951 9,684
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months   316
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 665 399
Available-for-sale Debt Securities Unrealized losses, Total $ 665 $ 715