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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
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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 |

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