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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
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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

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