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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details)
$ in Thousands
Jun. 30, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities 247 150
Less Than 12 Months, Fair Value $ 488,118 $ 344,216
12 Months or More, Fair Value $ 77,567 $ 67,073
12 Months or Greater, Number of Securities 49 18
Less Than 12 Months, Unrealized Losses $ 46,818 $ 5,354
12 Months or More, Unrealized Losses $ 16,789 $ 2,627
Total, Number of Securities 296 168
Total, Fair Value $ 565,685 $ 411,289
Total, Unrealized Losses $ 63,607 $ 7,981
U.S. Treasury securities    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities | security 53 42
Less Than 12 Months, Fair Value $ 232,013 $ 179,974
Less Than 12 Months, Unrealized Losses $ 16,272 $ 2,382
Total, Number of Securities | security 53 42
Total, Fair Value $ 232,013 $ 179,974
Total, Unrealized Losses $ 16,272 $ 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 $ 16,662  
Less Than 12 Months, Unrealized Losses $ 453  
Total, Number of Securities | security 5  
Total, Fair Value $ 16,662  
Total, Unrealized Losses $ 453  
State and Municipals, Taxable    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities | security 50 27
Less Than 12 Months, Fair Value $ 45,783 $ 26,827
12 Months or More, Fair Value $ 10,707 $ 8,008
12 Months or Greater, Number of Securities | security 14 8
Less Than 12 Months, Unrealized Losses $ 7,083 $ 718
12 Months or More, Unrealized Losses $ 2,944 $ 364
Total, Number of Securities | security 64 35
Total, Fair Value $ 56,490 $ 34,835
Total, Unrealized Losses $ 10,027 $ 1,082
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities | security 92 61
Less Than 12 Months, Fair Value $ 70,020 $ 38,693
12 Months or More, Fair Value $ 12,370 $ 10,319
12 Months or Greater, Number of Securities | security 23 2
Less Than 12 Months, Unrealized Losses $ 9,523 $ 358
12 Months or More, Unrealized Losses $ 2,810 $ 313
Total, Number of Securities | security 115 63
Total, Fair Value $ 82,390 $ 49,012
Total, Unrealized Losses $ 12,333 $ 671
Mortgage-backed Securities, U.S. Government agencies    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities | security 9 3
Less Than 12 Months, Fair Value $ 17,550 $ 18,398
Less Than 12 Months, Unrealized Losses $ 1,908 $ 391
Total, Number of Securities | security 9 3
Total, Fair Value $ 17,550 $ 18,398
Total, Unrealized Losses $ 1,908 $ 391
Mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities | security 30 13
Less Than 12 Months, Fair Value $ 91,177 $ 77,875
12 Months or More, Fair Value $ 53,591 $ 48,276
12 Months or Greater, Number of Securities | security 10 7
Less Than 12 Months, Unrealized Losses $ 11,118 $ 1,454
12 Months or More, Unrealized Losses $ 10,934 $ 1,920
Total, Number of Securities | security 40 20
Total, Fair Value $ 144,768 $ 126,151
Total, Unrealized Losses $ 22,052 $ 3,374
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 $ 12,102  
Less Than 12 Months, Unrealized Losses $ 272  
Total, Number of Securities | security 4  
Total, Fair Value $ 12,102  
Total, Unrealized Losses $ 272  
Corporate Debt Securities    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Number of Securities | security 4 4
Less Than 12 Months, Fair Value $ 2,811 $ 2,449
12 Months or More, Fair Value $ 899 $ 470
12 Months or Greater, Number of Securities | security 2 1
Less Than 12 Months, Unrealized Losses $ 189 $ 51
12 Months or More, Unrealized Losses $ 101 $ 30
Total, Number of Securities | security 6 5
Total, Fair Value $ 3,710 $ 2,919
Total, Unrealized Losses $ 290 $ 81