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Investment securities - Fair Value and Unrealized Losses of Investment Securities in Continuous Unrealized Loss Position (Details) $ in Thousands | Sep. 30, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
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Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Number of Securities in a Loss Position | 11 | 98
Less Than 12 Months, Fair Value | $ 6,068 | $ 159,303
Less Than 12 Months, Unrealized Losses | $ 281 | $ 9,341
12 Months or Greater, Number of Securities in a Loss Position | 272 | 204
12 Months or Greater, Fair Value | $ 444,812 | $ 385,821
12 Months or Greater, Unrealized Losses | $ 88,178 | $ 71,619
Total, Number of Securities in a Loss Position | 283 | 302
Total, Fair Value | $ 450,880 | $ 545,124
Total, Unrealized Losses | $ 88,459 | $ 80,960
U.S. Treasury securities |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Number of Securities in a Loss Position | security |  | 5
Less Than 12 Months, Fair Value |  | $ 23,700
Less Than 12 Months, Unrealized Losses |  | $ 1,887
12 Months or Greater, Number of Securities in a Loss Position | security | 43 | 40
12 Months or Greater, Fair Value | $ 179,146 | $ 156,597
12 Months or Greater, Unrealized Losses | $ 18,687 | $ 17,753
Total, Number of Securities in a Loss Position | security | 43 | 45
Total, Fair Value | $ 179,146 | $ 180,297
Total, Unrealized Losses | $ 18,687 | $ 19,640
U.S. Government-sponsored enterprises state and municipals |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Number of Securities in a Loss Position | security |  | 4
Less Than 12 Months, Fair Value |  | $ 14,104
Less Than 12 Months, Unrealized Losses |  | $ 197
12 Months or Greater, Number of Securities in a Loss Position | security | 2 | 1
12 Months or Greater, Fair Value | $ 2,038 | $ 2,266
12 Months or Greater, Unrealized Losses | $ 504 | $ 388
Total, Number of Securities in a Loss Position | security | 2 | 5
Total, Fair Value | $ 2,038 | $ 16,370
Total, Unrealized Losses | $ 504 | $ 585
State and Municipals, Taxable |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Number of Securities in a Loss Position | security | 1 | 21
Less Than 12 Months, Fair Value | $ 985 | $ 19,919
Less Than 12 Months, Unrealized Losses | $ 16 | $ 2,908
12 Months or Greater, Number of Securities in a Loss Position | security | 65 | 45
12 Months or Greater, Fair Value | $ 53,002 | $ 34,464
12 Months or Greater, Unrealized Losses | $ 13,863 | $ 10,680
Total, Number of Securities in a Loss Position | security | 66 | 66
Total, Fair Value | $ 53,987 | $ 54,383
Total, Unrealized Losses | $ 13,879 | $ 13,588
State and Municipals, Tax-exempt |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Number of Securities in a Loss Position | security | 10 | 39
Less Than 12 Months, Fair Value | $ 5,083 | $ 30,973
Less Than 12 Months, Unrealized Losses | $ 265 | $ 1,690
12 Months or Greater, Number of Securities in a Loss Position | security | 103 | 84
12 Months or Greater, Fair Value | $ 66,465 | $ 59,664
12 Months or Greater, Unrealized Losses | $ 15,584 | $ 10,611
Total, Number of Securities in a Loss Position | security | 113 | 123
Total, Fair Value | $ 71,548 | $ 90,637
Total, Unrealized Losses | $ 15,849 | $ 12,301
Residential mortgage-backed securities, U.S. government agencies |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Number of Securities in a Loss Position | security |  | 5
Less Than 12 Months, Fair Value |  | $ 904
Less Than 12 Months, Unrealized Losses |  | $ 39
12 Months or Greater, Number of Securities in a Loss Position | security | 8 | 4
12 Months or Greater, Fair Value | $ 13,157 | $ 14,326
12 Months or Greater, Unrealized Losses | $ 3,391 | $ 3,017
Total, Number of Securities in a Loss Position | security | 8 | 9
Total, Fair Value | $ 13,157 | $ 15,230
Total, Unrealized Losses | $ 3,391 | $ 3,056
Residential mortgage-backed securities, U.S. government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Number of Securities in a Loss Position | security |  | 19
Less Than 12 Months, Fair Value |  | $ 57,166
Less Than 12 Months, Unrealized Losses |  | $ 2,029
12 Months or Greater, Number of Securities in a Loss Position | security | 41 | 25
12 Months or Greater, Fair Value | $ 115,911 | $ 115,831
12 Months or Greater, Unrealized Losses | $ 35,188 | $ 28,843
Total, Number of Securities in a Loss Position | security | 41 | 44
Total, Fair Value | $ 115,911 | $ 172,997
Total, Unrealized Losses | $ 35,188 | $ 30,872
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Number of Securities in a Loss Position | security |  | 4
Less Than 12 Months, Fair Value |  | $ 11,584
Less Than 12 Months, Unrealized Losses |  | $ 544
12 Months or Greater, Number of Securities in a Loss Position | security | 4 |
12 Months or Greater, Fair Value | $ 11,476 |
12 Months or Greater, Unrealized Losses | $ 578 |
Total, Number of Securities in a Loss Position | security | 4 | 4
Total, Fair Value | $ 11,476 | $ 11,584
Total, Unrealized Losses | $ 578 | $ 544
Corporate debt securities |  |
Available-for-sale and Held-to-maturity securities |  |
Less Than 12 Months, Number of Securities in a Loss Position | security |  | 1
Less Than 12 Months, Fair Value |  | $ 953
Less Than 12 Months, Unrealized Losses |  | $ 47
12 Months or Greater, Number of Securities in a Loss Position | security | 6 | 5
12 Months or Greater, Fair Value | $ 3,617 | $ 2,673
12 Months or Greater, Unrealized Losses | $ 383 | $ 327
Total, Number of Securities in a Loss Position | security | 6 | 6
Total, Fair Value | $ 3,617 | $ 3,626
Total, Unrealized Losses | $ 383 | $ 374

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