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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value $ 344,216 $ 27,585
12 Months or More, Fair Value 67,073 284
Less Than 12 Months, Unrealized Losses 5,354 202
12 Months or More, Unrealized Losses 2,627 1
Total, Fair Value 411,289 27,869
Total, Unrealized Losses 7,981 203
State and Municipals, Taxable    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 26,827 9,246
12 Months or More, Fair Value 8,008  
Less Than 12 Months, Unrealized Losses 718 30
12 Months or More, Unrealized Losses 364  
Total, Fair Value 34,835 9,246
Total, Unrealized Losses 1,082 30
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 38,693 6,786
12 Months or More, Fair Value 10,319  
Less Than 12 Months, Unrealized Losses 357 37
12 Months or More, Unrealized Losses 313  
Total, Fair Value 49,012 6,786
Total, Unrealized Losses 670 37
U.S. Treasury securities    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 179,974  
Less Than 12 Months, Unrealized Losses 2,382  
Total, Fair Value 179,974  
Total, Unrealized Losses 2,382  
Mortgage-backed Securities, U.S. Government agencies    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 18,398  
Less Than 12 Months, Unrealized Losses 392  
Total, Fair Value 18,398  
Total, Unrealized Losses 392  
Mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 77,875 11,553
12 Months or More, Fair Value 48,276 284
Less Than 12 Months, Unrealized Losses 1,454 135
12 Months or More, Unrealized Losses 1,919 1
Total, Fair Value 126,151 11,837
Total, Unrealized Losses 3,373 $ 136
Corporate Debt Securities    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 2,449  
12 Months or More, Fair Value 470  
Less Than 12 Months, Unrealized Losses 51  
12 Months or More, Unrealized Losses 31  
Total, Fair Value 2,919  
Total, Unrealized Losses $ 82