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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Available-for-sale Debt Securities    
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security 60 3
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 233 248
Total, Available-for-sale, Number of Securities in a Loss Position | security 293 251
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 66,752 $ 1,570
Available-for-sale Debt Securities, 12 Months or More, Fair Value 361,723 397,201
Available-for-sale Debt Securities, Total 428,475 398,771
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 1,175 11
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 49,250 51,516
Available-for-sale Debt Securities Unrealized losses, Total $ 50,425 $ 51,527
Held to Maturity, Debt Securities    
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security 4 2
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security 24 22
Total, Held to Maturity, Number of Securities in a Loss Position | security 28 24
Held-to-maturity Debt (HTM) Securities, Less than 12 Months $ 2,508 $ 1,438
Held-to-maturity Debt (HTM) Securities, 12 months or More 62,644 67,365
Held-to-maturity Debt (HTM) Securities, Total 65,152  
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months 66 36
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 12,966 13,118
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 13,032  
Held-to-maturity Fair Value   68,803
Held-to-maturity Debt Unrealized losses, Total   $ 13,154
U.S. Treasury securities    
Available-for-sale Debt Securities    
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 38 43
Total, Available-for-sale, Number of Securities in a Loss Position | security 38 43
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 167,551 $ 184,057
Available-for-sale Debt Securities, Total 167,551 184,057
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 8,751 13,863
Available-for-sale Debt Securities Unrealized losses, Total $ 8,751 $ 13,863
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   2
Total, Available-for-sale, Number of Securities in a Loss Position | security   2
Available-for-sale Debt Securities, 12 Months or More, Fair Value   $ 2,152
Available-for-sale Debt Securities, Total   2,152
Available-for-sale Debt Securities Unrealized losses, 12 Months or More   387
Available-for-sale Debt Securities Unrealized losses, Total   $ 387
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 $ 2,508  
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  
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 1
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 64 65
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 $ 1,097 $ 995
Available-for-sale Debt Securities, 12 Months or More, Fair Value 55,712 56,105
Available-for-sale Debt Securities, Total 56,809 57,100
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 6 6
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 10,475 10,725
Available-for-sale Debt Securities Unrealized losses, Total $ 10,481 $ 10,731
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 6 2
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 91 93
Total, Available-for-sale, Number of Securities in a Loss Position | security 97 95
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 1,874 $ 575
Available-for-sale Debt Securities, 12 Months or More, Fair Value 62,329 66,393
Available-for-sale Debt Securities, Total 64,203 66,968
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 41 5
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 10,239 8,613
Available-for-sale Debt Securities Unrealized losses, Total $ 10,280 $ 8,618
Held to Maturity, Debt Securities    
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security   2
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security   10
Total, Held to Maturity, Number of Securities in a Loss Position | security   12
Held-to-maturity Debt (HTM) Securities, Less than 12 Months   $ 1,438
Held-to-maturity Debt (HTM) Securities, 12 months or More   6,209
Held-to-maturity Debt (HTM) Securities, Total   7,647
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months   36
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More   624
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total   $ 660
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 3
Total, Available-for-sale, Number of Securities in a Loss Position | security 2 3
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 1,299  
Available-for-sale Debt Securities, 12 Months or More, Fair Value 3 $ 724
Available-for-sale Debt Securities, Total 1,302 724
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 27  
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 1 34
Available-for-sale Debt Securities Unrealized losses, Total $ 28 $ 34
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 $ 11,204 $ 12,747
Held-to-maturity Debt (HTM) Securities, Total 11,204 12,747
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 2,643 2,653
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 2,643 $ 2,653
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 29  
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 31 32
Total, Available-for-sale, Number of Securities in a Loss Position | security 60 32
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 40,886  
Available-for-sale Debt Securities, 12 Months or More, Fair Value 68,732 $ 72,671
Available-for-sale Debt Securities, Total 109,618 72,671
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 622  
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 18,925 17,264
Available-for-sale Debt Securities Unrealized losses, Total $ 19,547 $ 17,264
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 $ 44,205 $ 48,409
Held-to-maturity Debt (HTM) Securities, Total 44,205 48,409
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 9,286 9,841
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 9,286 $ 9,841
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 4
Total, Available-for-sale, Number of Securities in a Loss Position | security 1 4
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 1,856 $ 11,369
Available-for-sale Debt Securities, Total 1,856 11,369
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 71 360
Available-for-sale Debt Securities Unrealized losses, Total $ 71 $ 360
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  
Total, Available-for-sale, Number of Securities in a Loss Position | security 15  
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 12,854  
Available-for-sale Debt Securities, Total 12,854  
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 152  
Available-for-sale Debt Securities Unrealized losses, Total $ 152  
Asset backed securities    
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 1  
Total, Available-for-sale, Number of Securities in a Loss Position | security 3  
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 2,659  
Available-for-sale Debt Securities, 12 Months or More, Fair Value 1,939  
Available-for-sale Debt Securities, Total 4,598  
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 11  
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 389  
Available-for-sale Debt Securities Unrealized losses, Total $ 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 6 6
Total, Available-for-sale, Number of Securities in a Loss Position | security 11 6
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 6,083  
Available-for-sale Debt Securities, 12 Months or More, Fair Value 3,601 $ 3,730
Available-for-sale Debt Securities, Total 9,684 3,730
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 316  
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 399 270
Available-for-sale Debt Securities Unrealized losses, Total $ 715 $ 270