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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Sep. 30, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities 164 150
Less Than 12 Months, Fair Value $ 253,543 $ 344,216
12 Months or More, Fair Value $ 299,571 $ 67,073
12 Months or Greater, Number of Securities 153 18
Less Than 12 Months, Unrealized Losses $ 28,580 $ 5,354
12 Months or More, Unrealized Losses $ 60,263 $ 2,627
Total, Number of Securities 317 168
Total, Fair Value $ 553,114 $ 411,289
Total, Unrealized Losses $ 88,843 $ 7,981
U.S. Treasury securities    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities | security 16 42
Less Than 12 Months, Fair Value $ 83,156 $ 179,974
12 Months or More, Fair Value $ 141,180  
12 Months or Greater, Number of Securities | security 37  
Less Than 12 Months, Unrealized Losses $ 5,372 $ 2,382
12 Months or More, Unrealized Losses $ 18,104  
Total, Number of Securities | security 53 42
Total, Fair Value $ 224,336 $ 179,974
Total, Unrealized Losses $ 23,476 $ 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 | security 5  
Less Than 12 Months, Fair Value $ 16,351  
Less Than 12 Months, Unrealized Losses $ 625  
Total, Number of Securities | security 5  
Total, Fair Value $ 16,351  
Total, Unrealized Losses $ 625  
State and Municipals, Taxable    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities | security 32 27
Less Than 12 Months, Fair Value $ 27,779 $ 26,827
12 Months or More, Fair Value $ 26,547 $ 8,008
12 Months or Greater, Number of Securities | security 34 8
Less Than 12 Months, Unrealized Losses $ 4,951 $ 718
12 Months or More, Unrealized Losses $ 8,729 $ 364
Total, Number of Securities | security 66 35
Total, Fair Value $ 54,326 $ 34,835
Total, Unrealized Losses $ 13,680 $ 1,082
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities | security 74 61
Less Than 12 Months, Fair Value $ 57,580 $ 38,693
12 Months or More, Fair Value $ 35,886 $ 10,319
12 Months or Greater, Number of Securities | security 58 2
Less Than 12 Months, Unrealized Losses $ 7,835 $ 357
12 Months or More, Unrealized Losses $ 8,944 $ 313
Total, Number of Securities | security 132 63
Total, Fair Value $ 93,466 $ 49,012
Total, Unrealized Losses $ 16,779 $ 670
Mortgage-backed Securities, U.S. Government agencies    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities | security 6 3
Less Than 12 Months, Fair Value $ 1,098 $ 18,398
12 Months or More, Fair Value $ 15,046  
12 Months or Greater, Number of Securities | security 3  
Less Than 12 Months, Unrealized Losses $ 39 $ 392
12 Months or More, Unrealized Losses $ 2,679  
Total, Number of Securities | security 9 3
Total, Fair Value $ 16,144 $ 18,398
Total, Unrealized Losses $ 2,718 $ 392
Mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities | security 26 13
Less Than 12 Months, Fair Value $ 54,953 $ 77,875
12 Months or More, Fair Value $ 78,254 $ 48,276
12 Months or Greater, Number of Securities | security 16 7
Less Than 12 Months, Unrealized Losses $ 9,141 $ 1,454
12 Months or More, Unrealized Losses $ 21,465 $ 1,919
Total, Number of Securities | security 42 20
Total, Fair Value $ 133,207 $ 126,151
Total, Unrealized Losses $ 30,606 $ 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 | security 4  
Less Than 12 Months, Fair Value $ 11,679  
Less Than 12 Months, Unrealized Losses $ 564  
Total, Number of Securities | security 4  
Total, Fair Value $ 11,679  
Total, Unrealized Losses $ 564  
Corporate Debt Securities    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities | security 1 4
Less Than 12 Months, Fair Value $ 947 $ 2,449
12 Months or More, Fair Value $ 2,658 $ 470
12 Months or Greater, Number of Securities | security 5 1
Less Than 12 Months, Unrealized Losses $ 53 $ 51
12 Months or More, Unrealized Losses $ 342 $ 31
Total, Number of Securities | security 6 5
Total, Fair Value $ 3,605 $ 2,919
Total, Unrealized Losses $ 395 $ 82