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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Mar. 31, 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 44 60
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 230 233
Total, Available-for-sale, Number of Securities in a Loss Position | security 274 293
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 48,431 $ 66,752
Available-for-sale Debt Securities, 12 Months or More, Fair Value 352,419 361,723
Available-for-sale Debt Securities, Total 400,850 428,475
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 686 1,175
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 44,736 49,250
Available-for-sale Debt Securities Unrealized losses, Total $ 45,422 $ 50,425
Held to Maturity, Debt Securities    
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position 4 4
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position 24 24
Total, Held to Maturity, Number of Securities in a Loss Position 28 28
Held-to-maturity Debt (HTM) Securities, Less than 12 Months $ 2,490 $ 2,508
Held-to-maturity Debt (HTM) Securities, 12 months or More 62,285 62,644
Held-to-maturity Debt (HTM) Securities, Total 64,775 65,152
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months 85 66
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 11,829 12,966
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 11,914 $ 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 35 38
Total, Available-for-sale, Number of Securities in a Loss Position | security 35 38
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 157,674 $ 167,551
Available-for-sale Debt Securities, Total 157,674 167,551
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 6,761 8,751
Available-for-sale Debt Securities Unrealized losses, Total $ 6,761 $ 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 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 $ 2,490  
Held-to-maturity Debt (HTM) Securities, 12 months or More 7,229  
Held-to-maturity Debt (HTM) Securities, Total 9,719  
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months 85  
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 1,034  
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 1,119  
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 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 66 66
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 1,102 $ 1,097
Available-for-sale Debt Securities, 12 Months or More, Fair Value 57,137 55,712
Available-for-sale Debt Securities, Total 58,239 56,809
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 1 6
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 9,018 10,475
Available-for-sale Debt Securities Unrealized losses, Total $ 9,019 $ 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 7 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 98 97
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 2,265 $ 1,874
Available-for-sale Debt Securities, 12 Months or More, Fair Value 61,452 62,329
Available-for-sale Debt Securities, Total 63,717 64,203
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 44 41
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 10,925 10,239
Available-for-sale Debt Securities Unrealized losses, Total $ 10,969 $ 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 $ 1,335 $ 1,299
Available-for-sale Debt Securities, 12 Months or More, Fair Value 1 3
Available-for-sale Debt Securities, Total 1,336 1,302
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 6 27
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 1 1
Available-for-sale Debt Securities Unrealized losses, Total $ 7 $ 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 $ 11,139 $ 11,204
Held-to-maturity Debt (HTM) Securities, Total 11,139 11,204
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 2,334 2,643
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 2,334 $ 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 31 31
Total, Available-for-sale, Number of Securities in a Loss Position | security 45 60
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 23,713 $ 40,886
Available-for-sale Debt Securities, 12 Months or More, Fair Value 68,774 68,732
Available-for-sale Debt Securities, Total 92,487 109,618
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 263 622
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 17,264 18,925
Available-for-sale Debt Securities Unrealized losses, Total $ 17,527 $ 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 $ 43,917 $ 44,205
Held-to-maturity Debt (HTM) Securities, Total 43,917 44,205
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 8,461 9,286
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 8,461 $ 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 $ 1,875  
Available-for-sale Debt Securities, Total 1,875  
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 48  
Available-for-sale Debt Securities Unrealized losses, Total $ 48  
Private collateralized mortgage obligations    
Available-for-sale Debt Securities    
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security 14 15
Total, Available-for-sale, Number of Securities in a Loss Position | security 14 15
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 11,051 $ 12,854
Available-for-sale Debt Securities, Total 11,051 12,854
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 127 152
Available-for-sale Debt Securities Unrealized losses, Total $ 127 $ 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 1 1
Total, Available-for-sale, Number of Securities in a Loss Position | security 4 3
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 4,602 $ 2,659
Available-for-sale Debt Securities, 12 Months or More, Fair Value 1,905 1,939
Available-for-sale Debt Securities, Total 6,507 4,598
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 5 11
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 320 389
Available-for-sale Debt Securities Unrealized losses, Total $ 325 $ 400
Corporate debt securities    
Available-for-sale Debt Securities    
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security 3 5
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 6 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 $ 4,363 $ 6,083
Available-for-sale Debt Securities, 12 Months or More, Fair Value 3,601 3,601
Available-for-sale Debt Securities, Total 7,964 9,684
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 240 316
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 399 399
Available-for-sale Debt Securities Unrealized losses, Total $ 639 $ 715