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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Mar. 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 2 3
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 248 248
Total, Available-for-sale, Number of Securities in a Loss Position | security 250 251
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 578 $ 1,570
Available-for-sale Debt Securities, 12 Months or More, Fair Value 393,679 397,201
Available-for-sale Debt Securities, Total 394,257 398,771
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 2 11
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 53,966 51,516
Available-for-sale Debt Securities Unrealized losses, Total $ 53,968 $ 51,527
Held to Maturity, Debt Securities    
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security 2 2
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security 23 22
Total, Held to Maturity, Number of Securities in a Loss Position | security 25 24
Held-to-maturity Debt (HTM) Securities, Less than 12 Months $ 1,168 $ 1,438
Held-to-maturity Debt (HTM) Securities, 12 months or More 66,135 67,365
Held-to-maturity Debt (HTM) Securities, Total 67,303 68,803
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months 17 36
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 13,301 13,118
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 13,318 $ 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 43 43
Total, Available-for-sale, Number of Securities in a Loss Position | security 43 43
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 183,899 $ 184,057
Available-for-sale Debt Securities, Total 183,899 184,057
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 14,107 13,863
Available-for-sale Debt Securities Unrealized losses, Total $ 14,107 $ 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 2
Total, Available-for-sale, Number of Securities in a Loss Position | security 2 2
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 2,036 $ 2,152
Available-for-sale Debt Securities, Total 2,036 2,152
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 376 387
Available-for-sale Debt Securities Unrealized losses, Total $ 376 $ 387
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 66 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   $ 995
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 56,913 56,105
Available-for-sale Debt Securities, Total 56,913 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 10,883 10,725
Available-for-sale Debt Securities Unrealized losses, Total $ 10,883 $ 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 2 2
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 93 93
Total, Available-for-sale, Number of Securities in a Loss Position | security 95 95
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 578 $ 575
Available-for-sale Debt Securities, 12 Months or More, Fair Value 65,825 66,393
Available-for-sale Debt Securities, Total 66,403 66,968
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 2 5
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 8,981 8,613
Available-for-sale Debt Securities Unrealized losses, Total $ 8,983 $ 8,618
Held to Maturity, Debt Securities    
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security 2 2
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security 11 10
Total, Held to Maturity, Number of Securities in a Loss Position | security 13 12
Held-to-maturity Debt (HTM) Securities, Less than 12 Months $ 1,168 $ 1,438
Held-to-maturity Debt (HTM) Securities, 12 months or More 6,630 6,209
Held-to-maturity Debt (HTM) Securities, Total 7,798 7,647
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months 17 36
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 692 624
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 709 $ 660
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 3 3
Total, Available-for-sale, Number of Securities in a Loss Position | security 3 3
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 665 $ 724
Available-for-sale Debt Securities, Total 665 724
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 37 34
Available-for-sale Debt Securities Unrealized losses, Total $ 37 $ 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 $ 12,284 $ 12,747
Held-to-maturity Debt (HTM) Securities, Total 12,284 12,747
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 2,644 2,653
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 2,644 $ 2,653
Residential 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 31 32
Total, Available-for-sale, Number of Securities in a Loss Position | security 31 32
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 69,499 $ 72,671
Available-for-sale Debt Securities, Total 69,499 72,671
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 18,989 17,264
Available-for-sale Debt Securities Unrealized losses, Total $ 18,989 $ 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 $ 47,221 $ 48,409
Held-to-maturity Debt (HTM) Securities, Total 47,221 48,409
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 9,965 9,841
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 9,965 $ 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 4 4
Total, Available-for-sale, Number of Securities in a Loss Position | security 4 4
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 11,099 $ 11,369
Available-for-sale Debt Securities, Total 11,099 11,369
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 336 360
Available-for-sale Debt Securities Unrealized losses, Total $ 336 $ 360
Corporate Debt Securities    
Available-for-sale Debt Securities    
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 6 6
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 3,743 $ 3,730
Available-for-sale Debt Securities, Total 3,743 3,730
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 257 270
Available-for-sale Debt Securities Unrealized losses, Total $ 257 $ 270