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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Jun. 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 14 98
Less Than 12 Months, Fair Value $ 6,201 $ 159,303
Less Than 12 Months, Unrealized Losses $ 99 $ 9,341
12 Months or Greater, Number of Securities in a Loss Position 268 204
12 Months or Greater, Fair Value $ 461,427 $ 385,821
12 Months or Greater, Unrealized Losses $ 74,743 $ 71,619
Total, Number of Securities in a Loss Position 282 302
Total, Fair Value $ 467,628 $ 545,124
Total, Unrealized Losses $ 74,842 $ 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 $ 179,104 $ 156,597
12 Months or Greater, Unrealized Losses $ 18,642 $ 17,753
Total, Number of Securities in a Loss Position | security 43 45
Total, Fair Value $ 179,104 $ 180,297
Total, Unrealized Losses $ 18,642 $ 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 $ 2,201 $ 2,266
12 Months or Greater, Unrealized Losses $ 404 $ 388
Total, Number of Securities in a Loss Position | security 2 5
Total, Fair Value $ 2,201 $ 16,370
Total, Unrealized Losses $ 404 $ 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 3 21
Less Than 12 Months, Fair Value $ 1,984 $ 19,919
Less Than 12 Months, Unrealized Losses $ 24 $ 2,908
12 Months or Greater, Number of Securities in a Loss Position | security 64 45
12 Months or Greater, Fair Value $ 54,378 $ 34,464
12 Months or Greater, Unrealized Losses $ 12,005 $ 10,680
Total, Number of Securities in a Loss Position | security 67 66
Total, Fair Value $ 56,362 $ 54,383
Total, Unrealized Losses $ 12,029 $ 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 11 39
Less Than 12 Months, Fair Value $ 4,217 $ 30,973
Less Than 12 Months, Unrealized Losses $ 75 $ 1,690
12 Months or Greater, Number of Securities in a Loss Position | security 100 84
12 Months or Greater, Fair Value $ 70,868 $ 59,664
12 Months or Greater, Unrealized Losses $ 10,532 $ 10,611
Total, Number of Securities in a Loss Position | security 111 123
Total, Fair Value $ 75,085 $ 90,637
Total, Unrealized Losses $ 10,607 $ 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 $ 14,350 $ 14,326
12 Months or Greater, Unrealized Losses $ 2,907 $ 3,017
Total, Number of Securities in a Loss Position | security 8 9
Total, Fair Value $ 14,350 $ 15,230
Total, Unrealized Losses $ 2,907 $ 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 $ 125,453 $ 115,831
12 Months or Greater, Unrealized Losses $ 29,244 $ 28,843
Total, Number of Securities in a Loss Position | security 41 44
Total, Fair Value $ 125,453 $ 172,997
Total, Unrealized Losses $ 29,244 $ 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 $ 11,498  
12 Months or Greater, Unrealized Losses $ 584  
Total, Number of Securities in a Loss Position | security 4 4
Total, Fair Value $ 11,498 $ 11,584
Total, Unrealized Losses $ 584 $ 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 $ 3,575 $ 2,673
12 Months or Greater, Unrealized Losses $ 425 $ 327
Total, Number of Securities in a Loss Position | security 6 6
Total, Fair Value $ 3,575 $ 3,626
Total, Unrealized Losses $ 425 $ 374