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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
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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

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