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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Sep. 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 21 60
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 241 233
Total, Available-for-sale, Number of Securities in a Loss Position | security 262 293
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 44,504 $ 66,752
Available-for-sale Debt Securities, 12 Months or More, Fair Value 342,291 361,723
Available-for-sale Debt Securities, Total 386,795 428,475
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 240 1,175
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 36,775 49,250
Available-for-sale Debt Securities Unrealized losses, Total $ 37,015 $ 50,425
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 23 24
Total, Held to Maturity, Number of Securities in a Loss Position 23 28
Held-to-maturity Debt (HTM) Securities, Less than 12 Months   $ 2,508
Held-to-maturity Debt (HTM) Securities, 12 months or More $ 59,990 62,644
Held-to-maturity Debt (HTM) Securities, Total 59,990 65,152
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 9,745 12,966
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 9,745 $ 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 $ 128,507 $ 167,551
Available-for-sale Debt Securities, Total 128,507 167,551
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 4,187 8,751
Available-for-sale Debt Securities Unrealized losses, Total $ 4,187 $ 8,751
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 $ 58,578 55,712
Available-for-sale Debt Securities, Total 58,578 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 7,463 10,475
Available-for-sale Debt Securities Unrealized losses, Total $ 7,463 $ 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 1 6
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 89 91
Total, Available-for-sale, Number of Securities in a Loss Position | security 90 97
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 255 $ 1,874
Available-for-sale Debt Securities, 12 Months or More, Fair Value 63,370 62,329
Available-for-sale Debt Securities, Total 63,625 64,203
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 1 41
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 8,531 10,239
Available-for-sale Debt Securities Unrealized losses, Total $ 8,532 $ 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 11 12
Total, Held to Maturity, Number of Securities in a Loss Position | security 11 16
Held-to-maturity Debt (HTM) Securities, Less than 12 Months   $ 2,508
Held-to-maturity Debt (HTM) Securities, 12 months or More $ 6,615 7,235
Held-to-maturity Debt (HTM) Securities, Total 6,615 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 655 1,037
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 655 $ 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
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 1 2
Available-for-sale Debt Securities, Less than 12 Months, Fair Value   $ 1,299
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 1,369 3
Available-for-sale Debt Securities, Total 1,369 1,302
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months   27
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 5 1
Available-for-sale Debt Securities Unrealized losses, Total $ 5 $ 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 $ 10,551 $ 11,204
Held-to-maturity Debt (HTM) Securities, Total 10,551 11,204
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 2,088 2,643
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 2,088 $ 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 33 31
Total, Available-for-sale, Number of Securities in a Loss Position | security 47 60
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 31,779 $ 40,886
Available-for-sale Debt Securities, 12 Months or More, Fair Value 70,758 68,732
Available-for-sale Debt Securities, Total 102,537 109,618
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 155 622
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 15,649 18,925
Available-for-sale Debt Securities Unrealized losses, Total $ 15,804 $ 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 $ 42,824 $ 44,205
Held-to-maturity Debt (HTM) Securities, Total 42,824 44,205
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 7,002 9,286
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 7,002 $ 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 1
Total, Available-for-sale, Number of Securities in a Loss Position | security 1 1
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 1,888 $ 1,856
Available-for-sale Debt Securities, Total 1,888 1,856
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 27 71
Available-for-sale Debt Securities Unrealized losses, Total $ 27 $ 71
Private collateralized mortgage obligations    
Available-for-sale Debt Securities    
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security 5 15
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 10  
Total, Available-for-sale, Number of Securities in a Loss Position | security 15 15
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 10,174 $ 12,854
Available-for-sale Debt Securities, 12 Months or More, Fair Value 7,734  
Available-for-sale Debt Securities, Total 17,908 12,854
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 71 152
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 191  
Available-for-sale Debt Securities Unrealized losses, Total $ 262 $ 152
Asset backed securities    
Available-for-sale Debt Securities    
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security 1 2
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 2 1
Total, Available-for-sale, Number of Securities in a Loss Position | security 3 3
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 2,296 $ 2,659
Available-for-sale Debt Securities, 12 Months or More, Fair Value 1,892 1,939
Available-for-sale Debt Securities, Total 4,188 4,598
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 13 11
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 285 389
Available-for-sale Debt Securities Unrealized losses, Total $ 298 $ 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 $ 8,195 3,601
Available-for-sale Debt Securities, Total 8,195 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 437 399
Available-for-sale Debt Securities Unrealized losses, Total $ 437 $ 715