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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value $ 472,750 $ 344,216
12 Months or More, Fair Value 84,084 67,073
Less Than 12 Months, Unrealized Losses 30,442 5,354
12 Months or More, Unrealized Losses 11,284 2,627
Total, Fair Value 556,834 411,289
Total, Unrealized Losses 41,726 7,981
State and Municipals, Taxable    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 47,356 26,827
12 Months or More, Fair Value 11,711 8,008
Less Than 12 Months, Unrealized Losses 4,074 718
12 Months or More, Unrealized Losses 1,947 364
Total, Fair Value 59,067 34,835
Total, Unrealized Losses 6,021 1,082
State and Municipals, Tax-exempt    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 59,847 38,693
12 Months or More, Fair Value 13,125 10,319
Less Than 12 Months, Unrealized Losses 5,420 357
12 Months or More, Unrealized Losses 2,076 313
Total, Fair Value 72,972 49,012
Total, Unrealized Losses 7,496 670
U.S. Treasury securities    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 230,144 179,974
Less Than 12 Months, Unrealized Losses 12,624 2,382
Total, Fair Value 230,144 179,974
Total, Unrealized Losses 12,624 2,382
U.S. Government-sponsored enterprises state and municipals    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 13,918  
Less Than 12 Months, Unrealized Losses 184  
Total, Fair Value 13,918  
Total, Unrealized Losses 184  
Mortgage-backed Securities, U.S. Government agencies    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 17,193 18,398
Less Than 12 Months, Unrealized Losses 1,316 392
Total, Fair Value 17,193 18,398
Total, Unrealized Losses 1,316 392
Mortgage-backed Securities, U.S. Government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 91,894 77,875
12 Months or More, Fair Value 58,780 48,276
Less Than 12 Months, Unrealized Losses 6,551 1,454
12 Months or More, Unrealized Losses 7,229 1,919
Total, Fair Value 150,674 126,151
Total, Unrealized Losses 13,780 3,373
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 10,042  
Less Than 12 Months, Unrealized Losses 129  
Total, Fair Value 10,042  
Total, Unrealized Losses 129  
Corporate Debt Securities    
Available-for-sale and Held-to-maturity securities    
Less Than 12 Months, Fair Value 2,356 2,449
12 Months or More, Fair Value 468 470
Less Than 12 Months, Unrealized Losses 144 51
12 Months or More, Unrealized Losses 32 31
Total, Fair Value 2,824 2,919
Total, Unrealized Losses $ 176 $ 82