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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Jun. 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   3
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 247 248
Total, Available-for-sale, Number of Securities in a Loss Position | security 247 251
Available-for-sale Debt Securities, Less than 12 Months, Fair Value   $ 1,570
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 385,240 397,201
Available-for-sale Debt Securities, Total 385,240 398,771
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months   11
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 53,949 51,516
Available-for-sale Debt Securities Unrealized losses, Total $ 53,949 $ 51,527
Held to Maturity, Debt Securities    
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security 5 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 29 24
Held-to-maturity Debt (HTM) Securities, Less than 12 Months $ 2,883 $ 1,438
Held-to-maturity Debt (HTM) Securities, 12 months or More 65,341 67,365
Held-to-maturity Debt (HTM) Securities, Total 68,224 68,803
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months 11 36
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 13,363 13,118
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 13,374 $ 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 42 43
Total, Available-for-sale, Number of Securities in a Loss Position | security 42 43
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 180,007 $ 184,057
Available-for-sale Debt Securities, Total 180,007 184,057
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 13,085 13,863
Available-for-sale Debt Securities Unrealized losses, Total $ 13,085 $ 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 $ 2,032 $ 2,152
Available-for-sale Debt Securities, Total 2,032 2,152
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 377 387
Available-for-sale Debt Securities Unrealized losses, Total $ 377 $ 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 $ 56,837 56,105
Available-for-sale Debt Securities, Total 56,837 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 10,924 10,725
Available-for-sale Debt Securities Unrealized losses, Total $ 10,924 $ 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
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 94 93
Total, Available-for-sale, Number of Securities in a Loss Position | security 94 95
Available-for-sale Debt Securities, Less than 12 Months, Fair Value   $ 575
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 65,004 66,393
Available-for-sale Debt Securities, Total 65,004 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 9,873 8,613
Available-for-sale Debt Securities Unrealized losses, Total $ 9,873 $ 8,618
Held to Maturity, Debt Securities    
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security 5 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 17 12
Held-to-maturity Debt (HTM) Securities, Less than 12 Months $ 2,883 $ 1,438
Held-to-maturity Debt (HTM) Securities, 12 months or More 7,428 6,209
Held-to-maturity Debt (HTM) Securities, Total 10,311 7,647
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Less than 12 Months 11 36
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 862 624
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 873 $ 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 $ 604 $ 724
Available-for-sale Debt Securities, Total 604 724
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 34 34
Available-for-sale Debt Securities Unrealized losses, Total $ 34 $ 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 $ 11,848 $ 12,747
Held-to-maturity Debt (HTM) Securities, Total 11,848 12,747
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 2,706 2,653
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 2,706 $ 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 30 32
Total, Available-for-sale, Number of Securities in a Loss Position | security 30 32
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 67,664 $ 72,671
Available-for-sale Debt Securities, Total 67,664 72,671
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 19,090 17,264
Available-for-sale Debt Securities Unrealized losses, Total $ 19,090 $ 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 $ 46,065 $ 48,409
Held-to-maturity Debt (HTM) Securities, Total 46,065 48,409
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More 9,795 9,841
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ 9,795 $ 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 $ 9,364 $ 11,369
Available-for-sale Debt Securities, Total 9,364 11,369
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 294 360
Available-for-sale Debt Securities Unrealized losses, Total $ 294 $ 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 $ 3,728 $ 3,730
Available-for-sale Debt Securities, Total 3,728 3,730
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 272 270
Available-for-sale Debt Securities Unrealized losses, Total $ 272 $ 270