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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities in a Loss Position | security 98 150
Less Than 12 Months, Fair Value $ 159,303 $ 344,216
Less Than 12 Months, Unrealized Losses $ 9,341 $ 5,354
12 Months or Greater, Number of Securities in a Loss Position | security 204 18
12 Months or Greater, Fair Value $ 385,821 $ 67,073
12 Months or Greater, Unrealized Losses $ 71,619 $ 2,627
Total, Number of Securities in a Loss Position | security 302 168
Total, Fair Value $ 545,124 $ 411,289
Total, Unrealized Losses $ 80,960 $ 7,981
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 42
Less Than 12 Months, Fair Value $ 23,700 $ 179,974
Less Than 12 Months, Unrealized Losses $ 1,887 $ 2,382
12 Months or Greater, Number of Securities in a Loss Position | security 40  
12 Months or Greater, Fair Value $ 156,597  
12 Months or Greater, Unrealized Losses $ 17,753  
Total, Number of Securities in a Loss Position | security 45 42
Total, Fair Value $ 180,297 $ 179,974
Total, Unrealized Losses $ 19,640 $ 2,382
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 1  
12 Months or Greater, Fair Value $ 2,266  
12 Months or Greater, Unrealized Losses $ 388  
Total, Number of Securities in a Loss Position | security 5  
Total, Fair Value $ 16,370  
Total, Unrealized Losses $ 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 21 27
Less Than 12 Months, Fair Value $ 19,919 $ 26,827
Less Than 12 Months, Unrealized Losses $ 2,908 $ 718
12 Months or Greater, Number of Securities in a Loss Position | security 45 8
12 Months or Greater, Fair Value $ 34,464 $ 8,008
12 Months or Greater, Unrealized Losses $ 10,680 $ 364
Total, Number of Securities in a Loss Position | security 66 35
Total, Fair Value $ 54,383 $ 34,835
Total, Unrealized Losses $ 13,588 $ 1,082
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 39 61
Less Than 12 Months, Fair Value $ 30,973 $ 38,693
Less Than 12 Months, Unrealized Losses $ 1,690 $ 357
12 Months or Greater, Number of Securities in a Loss Position | security 84 2
12 Months or Greater, Fair Value $ 59,664 $ 10,319
12 Months or Greater, Unrealized Losses $ 10,611 $ 313
Total, Number of Securities in a Loss Position | security 123 63
Total, Fair Value $ 90,637 $ 49,012
Total, Unrealized Losses $ 12,301 $ 670
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 3
Less Than 12 Months, Fair Value $ 904 $ 18,398
Less Than 12 Months, Unrealized Losses $ 39 $ 392
12 Months or Greater, Number of Securities in a Loss Position | security 4  
12 Months or Greater, Fair Value $ 14,326  
12 Months or Greater, Unrealized Losses $ 3,017  
Total, Number of Securities in a Loss Position | security 9 3
Total, Fair Value $ 15,230 $ 18,398
Total, Unrealized Losses $ 3,056 $ 392
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 13
Less Than 12 Months, Fair Value $ 57,166 $ 77,875
Less Than 12 Months, Unrealized Losses $ 2,029 $ 1,454
12 Months or Greater, Number of Securities in a Loss Position | security 25 7
12 Months or Greater, Fair Value $ 115,831 $ 48,276
12 Months or Greater, Unrealized Losses $ 28,843 $ 1,919
Total, Number of Securities in a Loss Position | security 44 20
Total, Fair Value $ 172,997 $ 126,151
Total, Unrealized Losses $ 30,872 $ 3,373
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 0  
12 Months or Greater, Fair Value $ 0  
12 Months or Greater, Unrealized Losses $ 0  
Total, Number of Securities in a Loss Position | security 4  
Total, Fair Value $ 11,584  
Total, Unrealized Losses $ 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 4
Less Than 12 Months, Fair Value $ 953 $ 2,449
Less Than 12 Months, Unrealized Losses $ 47 $ 51
12 Months or Greater, Number of Securities in a Loss Position | security 5 1
12 Months or Greater, Fair Value $ 2,673 $ 470
12 Months or Greater, Unrealized Losses $ 327 $ 31
Total, Number of Securities in a Loss Position | security 6 5
Total, Fair Value $ 3,626 $ 2,919
Total, Unrealized Losses $ 374 $ 82