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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Mar. 31, 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 13 98
Less Than 12 Months, Fair Value $ 7,365 $ 159,303
Less Than 12 Months, Unrealized Losses $ 177 $ 9,341
12 Months or Greater, Number of Securities in a Loss Position 265 204
12 Months or Greater, Fair Value $ 480,662 $ 385,821
12 Months or Greater, Unrealized Losses $ 67,964 $ 71,619
Total, Number of Securities in a Loss Position 278 302
Total, Fair Value $ 488,027 $ 545,124
Total, Unrealized Losses $ 68,141 $ 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 $ 181,564 $ 156,597
12 Months or Greater, Unrealized Losses $ 16,096 $ 17,753
Total, Number of Securities in a Loss Position | security 43 45
Total, Fair Value $ 181,564 $ 180,297
Total, Unrealized Losses $ 16,096 $ 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 5 1
12 Months or Greater, Fair Value $ 16,431 $ 2,266
12 Months or Greater, Unrealized Losses $ 441 $ 388
Total, Number of Securities in a Loss Position | security 5 5
Total, Fair Value $ 16,431 $ 16,370
Total, Unrealized Losses $ 441 $ 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 2 21
Less Than 12 Months, Fair Value $ 999 $ 19,919
Less Than 12 Months, Unrealized Losses $ 19 $ 2,908
12 Months or Greater, Number of Securities in a Loss Position | security 63 45
12 Months or Greater, Fair Value $ 54,709 $ 34,464
12 Months or Greater, Unrealized Losses $ 11,208 $ 10,680
Total, Number of Securities in a Loss Position | security 65 66
Total, Fair Value $ 55,708 $ 54,383
Total, Unrealized Losses $ 11,227 $ 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 7 39
Less Than 12 Months, Fair Value $ 3,095 $ 30,973
Less Than 12 Months, Unrealized Losses $ 29 $ 1,690
12 Months or Greater, Number of Securities in a Loss Position | security 98 84
12 Months or Greater, Fair Value $ 70,366 $ 59,664
12 Months or Greater, Unrealized Losses $ 9,740 $ 10,611
Total, Number of Securities in a Loss Position | security 105 123
Total, Fair Value $ 73,461 $ 90,637
Total, Unrealized Losses $ 9,769 $ 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 2 5
Less Than 12 Months, Fair Value $ 818 $ 904
Less Than 12 Months, Unrealized Losses $ 31 $ 39
12 Months or Greater, Number of Securities in a Loss Position | security 7 4
12 Months or Greater, Fair Value $ 14,355 $ 14,326
12 Months or Greater, Unrealized Losses $ 2,544 $ 3,017
Total, Number of Securities in a Loss Position | security 9 9
Total, Fair Value $ 15,173 $ 15,230
Total, Unrealized Losses $ 2,575 $ 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 1 19
Less Than 12 Months, Fair Value $ 527 $ 57,166
Less Than 12 Months, Unrealized Losses $ 12 $ 2,029
12 Months or Greater, Number of Securities in a Loss Position | security 40 25
12 Months or Greater, Fair Value $ 129,931 $ 115,831
12 Months or Greater, Unrealized Losses $ 27,148 $ 28,843
Total, Number of Securities in a Loss Position | security 41 44
Total, Fair Value $ 130,458 $ 172,997
Total, Unrealized Losses $ 27,160 $ 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 1 4
Less Than 12 Months, Fair Value $ 1,926 $ 11,584
Less Than 12 Months, Unrealized Losses $ 86 $ 544
12 Months or Greater, Number of Securities in a Loss Position | security 3  
12 Months or Greater, Fair Value $ 9,695  
12 Months or Greater, Unrealized Losses $ 398  
Total, Number of Securities in a Loss Position | security 4 4
Total, Fair Value $ 11,621 $ 11,584
Total, Unrealized Losses $ 484 $ 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 $ 3,611 $ 2,673
12 Months or Greater, Unrealized Losses $ 389 $ 327
Total, Number of Securities in a Loss Position | security 6 6
Total, Fair Value $ 3,611 $ 3,626
Total, Unrealized Losses $ 389 $ 374