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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 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 20 3
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 237 248
Total, Available-for-sale, Number of Securities in a Loss Position | security 257 251
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 20,832 $ 1,570
Available-for-sale Debt Securities, 12 Months or More, Fair Value 387,315 397,201
Available-for-sale Debt Securities, Total 408,147 398,771
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 379 11
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 41,288 51,516
Available-for-sale Debt Securities Unrealized losses, Total $ 41,667 $ 51,527
Held to Maturity, Debt Securities    
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position 4 2
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position 24 22
Total, Held to Maturity, Number of Securities in a Loss Position 28 24
Held-to-maturity Debt (HTM) Securities, Less than 12 Months $ 1,182 $ 1,438
Held-to-maturity Debt (HTM) Securities, 12 months or More 66,147 67,365
Held-to-maturity Debt (HTM) Securities, Total 67,329 68,803
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months 7 36
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 10,820 13,118
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 10,827 $ 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 41 43
Total, Available-for-sale, Number of Securities in a Loss Position | security 41 43
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 180,815 $ 184,057
Available-for-sale Debt Securities, Total 180,815 184,057
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 8,375 13,863
Available-for-sale Debt Securities Unrealized losses, Total $ 8,375 $ 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 2
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security 12 10
Total, Held to Maturity, Number of Securities in a Loss Position | security 16 12
Held-to-maturity Debt (HTM) Securities, Less than 12 Months $ 1,182 $ 1,438
Held-to-maturity Debt (HTM) Securities, 12 months or More 7,453 6,209
Held-to-maturity Debt (HTM) Securities, Total 8,635 7,647
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months 7 36
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 828 624
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 835 $ 660
State and municipals, Taxable    
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 64 65
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   $ 995
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 58,033 56,105
Available-for-sale Debt Securities, Total 58,033 57,100
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months   6
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 8,186 10,725
Available-for-sale Debt Securities Unrealized losses, Total $ 8,186 $ 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 1 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 92 95
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 680 $ 575
Available-for-sale Debt Securities, 12 Months or More, Fair Value 64,293 66,393
Available-for-sale Debt Securities, Total 64,973 66,968
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months   5
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 8,467 8,613
Available-for-sale Debt Securities Unrealized losses, Total $ 8,467 $ 8,618
Residential mortgage-backed securities, U.S. government agencies    
Available-for-sale Debt Securities    
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 1 3
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 6 $ 724
Available-for-sale Debt Securities, Total 6 724
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 0 34
Available-for-sale Debt Securities Unrealized losses, Total $ 0 $ 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 $ 11,853 $ 12,747
Held-to-maturity Debt (HTM) Securities, Total 11,853 12,747
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 2,298 2,653
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 2,298 $ 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 1  
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 32 32
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 3,601  
Available-for-sale Debt Securities, 12 Months or More, Fair Value 73,997 $ 72,671
Available-for-sale Debt Securities, Total 77,598 72,671
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 41  
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 15,495 17,264
Available-for-sale Debt Securities Unrealized losses, Total $ 15,536 $ 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 $ 46,841 $ 48,409
Held-to-maturity Debt (HTM) Securities, Total 46,841 48,409
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 7,694 9,841
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 7,694 $ 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 2 4
Total, Available-for-sale, Number of Securities in a Loss Position | security 2 4
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 4,548 $ 11,369
Available-for-sale Debt Securities, Total 4,548 11,369
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 60 360
Available-for-sale Debt Securities Unrealized losses, Total $ 60 $ 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 9  
Total, Available-for-sale, Number of Securities in a Loss Position | security 9  
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 7,699  
Available-for-sale Debt Securities, Total 7,699  
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 12  
Available-for-sale Debt Securities Unrealized losses, Total $ 12  
Asset backed securities    
Available-for-sale Debt Securities    
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security 3  
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 4  
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 2,818  
Available-for-sale Debt Securities, 12 Months or More, Fair Value 2,024  
Available-for-sale Debt Securities, Total 4,842  
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 11  
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 303  
Available-for-sale Debt Securities Unrealized losses, Total $ 314  
Corporate debt securities    
Available-for-sale Debt Securities    
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security 6  
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 12 6
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 6,034  
Available-for-sale Debt Securities, 12 Months or More, Fair Value 3,599 $ 3,730
Available-for-sale Debt Securities, Total 9,633 3,730
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 315  
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 402 270
Available-for-sale Debt Securities Unrealized losses, Total $ 717 $ 270