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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities in a Loss Position 11 98
Less Than 12 Months, Fair Value $ 6,068 $ 159,303
Less Than 12 Months, Unrealized Losses $ 281 $ 9,341
12 Months or Greater, Number of Securities in a Loss Position 272 204
12 Months or Greater, Fair Value $ 444,812 $ 385,821
12 Months or Greater, Unrealized Losses $ 88,178 $ 71,619
Total, Number of Securities in a Loss Position 283 302
Total, Fair Value $ 450,880 $ 545,124
Total, Unrealized Losses $ 88,459 $ 80,960
U.S. Treasury securities    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities in a Loss Position | security   5
Less Than 12 Months, Fair Value   $ 23,700
Less Than 12 Months, Unrealized Losses   $ 1,887
12 Months or Greater, Number of Securities in a Loss Position | security 43 40
12 Months or Greater, Fair Value $ 179,146 $ 156,597
12 Months or Greater, Unrealized Losses $ 18,687 $ 17,753
Total, Number of Securities in a Loss Position | security 43 45
Total, Fair Value $ 179,146 $ 180,297
Total, Unrealized Losses $ 18,687 $ 19,640
U.S. Government-sponsored enterprises state and municipals    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities in a Loss Position | security   4
Less Than 12 Months, Fair Value   $ 14,104
Less Than 12 Months, Unrealized Losses   $ 197
12 Months or Greater, Number of Securities in a Loss Position | security 2 1
12 Months or Greater, Fair Value $ 2,038 $ 2,266
12 Months or Greater, Unrealized Losses $ 504 $ 388
Total, Number of Securities in a Loss Position | security 2 5
Total, Fair Value $ 2,038 $ 16,370
Total, Unrealized Losses $ 504 $ 585
State and Municipals, Taxable    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities in a Loss Position | security 1 21
Less Than 12 Months, Fair Value $ 985 $ 19,919
Less Than 12 Months, Unrealized Losses $ 16 $ 2,908
12 Months or Greater, Number of Securities in a Loss Position | security 65 45
12 Months or Greater, Fair Value $ 53,002 $ 34,464
12 Months or Greater, Unrealized Losses $ 13,863 $ 10,680
Total, Number of Securities in a Loss Position | security 66 66
Total, Fair Value $ 53,987 $ 54,383
Total, Unrealized Losses $ 13,879 $ 13,588
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities in a Loss Position | security 10 39
Less Than 12 Months, Fair Value $ 5,083 $ 30,973
Less Than 12 Months, Unrealized Losses $ 265 $ 1,690
12 Months or Greater, Number of Securities in a Loss Position | security 103 84
12 Months or Greater, Fair Value $ 66,465 $ 59,664
12 Months or Greater, Unrealized Losses $ 15,584 $ 10,611
Total, Number of Securities in a Loss Position | security 113 123
Total, Fair Value $ 71,548 $ 90,637
Total, Unrealized Losses $ 15,849 $ 12,301
Residential mortgage-backed securities, U.S. government agencies    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities in a Loss Position | security   5
Less Than 12 Months, Fair Value   $ 904
Less Than 12 Months, Unrealized Losses   $ 39
12 Months or Greater, Number of Securities in a Loss Position | security 8 4
12 Months or Greater, Fair Value $ 13,157 $ 14,326
12 Months or Greater, Unrealized Losses $ 3,391 $ 3,017
Total, Number of Securities in a Loss Position | security 8 9
Total, Fair Value $ 13,157 $ 15,230
Total, Unrealized Losses $ 3,391 $ 3,056
Residential mortgage-backed securities, U.S. government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities in a Loss Position | security   19
Less Than 12 Months, Fair Value   $ 57,166
Less Than 12 Months, Unrealized Losses   $ 2,029
12 Months or Greater, Number of Securities in a Loss Position | security 41 25
12 Months or Greater, Fair Value $ 115,911 $ 115,831
12 Months or Greater, Unrealized Losses $ 35,188 $ 28,843
Total, Number of Securities in a Loss Position | security 41 44
Total, Fair Value $ 115,911 $ 172,997
Total, Unrealized Losses $ 35,188 $ 30,872
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities in a Loss Position | security   4
Less Than 12 Months, Fair Value   $ 11,584
Less Than 12 Months, Unrealized Losses   $ 544
12 Months or Greater, Number of Securities in a Loss Position | security 4  
12 Months or Greater, Fair Value $ 11,476  
12 Months or Greater, Unrealized Losses $ 578  
Total, Number of Securities in a Loss Position | security 4 4
Total, Fair Value $ 11,476 $ 11,584
Total, Unrealized Losses $ 578 $ 544
Corporate debt securities    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities in a Loss Position | security   1
Less Than 12 Months, Fair Value   $ 953
Less Than 12 Months, Unrealized Losses   $ 47
12 Months or Greater, Number of Securities in a Loss Position | security 6 5
12 Months or Greater, Fair Value $ 3,617 $ 2,673
12 Months or Greater, Unrealized Losses $ 383 $ 327
Total, Number of Securities in a Loss Position | security 6 6
Total, Fair Value $ 3,617 $ 3,626
Total, Unrealized Losses $ 383 $ 374