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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Available-for-sale Debt Securities    
Available-for-sale, Less Than 12 Months, Number of Securities in a Loss Position | security 3 92
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 248 183
Total, Available-for-sale, Number of Securities in a Loss Position | security 251 275
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 1,570 $ 156,136
Available-for-sale Debt Securities, 12 Months or More, Fair Value 397,201 316,766
Available-for-sale Debt Securities, Total 398,771 472,902
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 11 9,312
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 51,516 57,060
Available-for-sale Debt Securities Unrealized losses, Total $ 51,527 $ 66,372
Held to Maturity, Debt Securities    
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security 2 6
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security 22 21
Total, Held to Maturity, Number of Securities in a Loss Position | security 24 27
Held-to-maturity Debt (HTM) Securities, Less than 12 Months $ 1,438  
Held-to-maturity Debt (HTM) Securities, 12 months or More 67,365  
Held-to-maturity Debt (HTM) Securities, Total 68,803  
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 (13,118)  
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ (13,154)  
Held-to-maturity Debt, Less than 12 Months   $ 3,167
Held-to-maturity Debt, 12 Months or More   69,055
Held-to-maturity Fair Value   72,222
Held-to-maturity Debt Unrealized losses, Less than 12 Months   29
Held-to-maturity Debt Unrealized losses, 12 Months or More   14,559
Held-to-maturity Debt Unrealized losses, Total   $ 14,588
U.S. Treasury 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 43 40
Total, Available-for-sale, Number of Securities in a Loss Position | security 43 45
Available-for-sale Debt Securities, Less than 12 Months, Fair Value   $ 23,700
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 184,057 156,597
Available-for-sale Debt Securities, Total 184,057 180,297
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months   1,887
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 13,863 17,753
Available-for-sale Debt Securities Unrealized losses, Total $ 13,863 $ 19,640
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   4
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 2 1
Total, Available-for-sale, Number of Securities in a Loss Position | security 2 5
Available-for-sale Debt Securities, Less than 12 Months, Fair Value   $ 14,104
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 2,152 2,266
Available-for-sale Debt Securities, Total 2,152 16,370
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months   197
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 387 388
Available-for-sale Debt Securities Unrealized losses, Total $ 387 $ 585
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 21
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 65 45
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 $ 19,919
Available-for-sale Debt Securities, 12 Months or More, Fair Value 56,105 34,464
Available-for-sale Debt Securities, Total 57,100 54,383
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 6 2,908
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 10,725 10,680
Available-for-sale Debt Securities Unrealized losses, Total $ 10,731 $ 13,588
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 36
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 93 74
Total, Available-for-sale, Number of Securities in a Loss Position | security 95 110
Available-for-sale Debt Securities, Less than 12 Months, Fair Value $ 575 $ 27,823
Available-for-sale Debt Securities, 12 Months or More, Fair Value 66,393 56,758
Available-for-sale Debt Securities, Total 66,968 84,581
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months 5 1,661
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 8,613 9,828
Available-for-sale Debt Securities Unrealized losses, Total $ 8,618 $ 11,489
Held to Maturity, Debt Securities    
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security 2 3
Held to Maturity, 12 Months or Longer, Number of Securities in a Loss Position | security 10 10
Total, Held to Maturity, Number of Securities in a Loss Position | security 12 13
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)  
Held-to-maturity Debt, Less than 12 Months   $ 3,150
Held-to-maturity Debt, 12 Months or More   2,906
Held-to-maturity Fair Value   6,056
Held-to-maturity Debt Unrealized losses, Less than 12 Months   29
Held-to-maturity Debt Unrealized losses, 12 Months or More   783
Held-to-maturity Debt Unrealized losses, Total   $ 812
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   3
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 3 1
Total, Available-for-sale, Number of Securities in a Loss Position | security 3 4
Available-for-sale Debt Securities, Less than 12 Months, Fair Value   $ 899
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 724 43
Available-for-sale Debt Securities, Total 724 942
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months   39
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 34 1
Available-for-sale Debt Securities Unrealized losses, Total $ 34 $ 40
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 4 3
Total, Held to Maturity, Number of Securities in a Loss Position | security 4 5
Held-to-maturity Debt (HTM) Securities, 12 months or More $ 12,747  
Held-to-maturity Debt (HTM) Securities, Total 12,747  
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More (2,653)  
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ (2,653)  
Held-to-maturity Debt, Less than 12 Months   $ 5
Held-to-maturity Debt, 12 Months or More   14,283
Held-to-maturity Fair Value   14,288
Held-to-maturity Debt Unrealized losses, 12 Months or More   3,016
Held-to-maturity Debt Unrealized losses, Total   $ 3,016
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   18
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 32 17
Total, Available-for-sale, Number of Securities in a Loss Position | security 32 35
Available-for-sale Debt Securities, Less than 12 Months, Fair Value   $ 57,154
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 72,671 63,965
Available-for-sale Debt Securities, Total 72,671 121,119
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months   2,029
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 17,264 18,083
Available-for-sale Debt Securities Unrealized losses, Total $ 17,264 $ 20,112
Held to Maturity, Debt Securities    
Held to Maturity, Less Than 12 Months, Number of Securities in a Loss Position | security   1
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 9
Held-to-maturity Debt (HTM) Securities, 12 months or More $ 48,409  
Held-to-maturity Debt (HTM) Securities, Total 48,409  
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, 12 Months or More (9,841)  
Held-to-maturity Debt (HTM) Securities, Unrealized Loss Position, Total $ (9,841)  
Held-to-maturity Debt, Less than 12 Months   $ 12
Held-to-maturity Debt, 12 Months or More   51,866
Held-to-maturity Fair Value   51,878
Held-to-maturity Debt Unrealized losses, 12 Months or More   10,760
Held-to-maturity Debt Unrealized losses, Total   $ 10,760
Commercial 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   4
Available-for-sale, 12 Months or Greater, Number of Securities in a Loss Position | security 4  
Total, Available-for-sale, Number of Securities in a Loss Position | security 4 4
Available-for-sale Debt Securities, Less than 12 Months, Fair Value   $ 11,584
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 11,369  
Available-for-sale Debt Securities, Total 11,369 11,584
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months   544
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 360  
Available-for-sale Debt Securities Unrealized losses, Total $ 360 $ 544
Corporate Debt Securities    
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 6 5
Total, Available-for-sale, Number of Securities in a Loss Position | security 6 6
Available-for-sale Debt Securities, Less than 12 Months, Fair Value   $ 953
Available-for-sale Debt Securities, 12 Months or More, Fair Value $ 3,730 2,673
Available-for-sale Debt Securities, Total 3,730 3,626
Available-for-sale Debt Securities Unrealized losses, Less than 12 Months   47
Available-for-sale Debt Securities Unrealized losses, 12 Months or More 270 327
Available-for-sale Debt Securities Unrealized losses, Total $ 270 $ 374