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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Investment Securities |  |
Available-for-sale, Amortized Cost | $ 569,885 | $ 519,112
Available-for-sale, Gross Unrealized Gains | 743 | 5,294
Available-for-sale, Gross Unrealized Losses | 35,146 | 7,085
Available-for-sale, Fair Value | 535,482 | 517,321
Held-to-maturity, Amortized Cost | 95,829 | 71,213
Held-to-maturity, Gross Unrealized Gains | 31 | 129
Held-to-maturity, Gross Unrealized Losses | 6,580 | 896
Held-to-maturity, Fair value | 89,280 | 70,446
U.S. Treasury securities |  |
Investment Securities |  |
Available-for-sale, Amortized Cost | 250,268 | 193,849
Available-for-sale, Gross Unrealized Gains | 28 | 107
Available-for-sale, Gross Unrealized Losses | 12,624 | 2,382
Available-for-sale, Fair Value | 237,672 | 191,574
U.S. Government-sponsored enterprises state and municipals |  |
Investment Securities |  |
Available-for-sale, Amortized Cost | 28,174 | 33,435
Available-for-sale, Gross Unrealized Gains | 31 | 343
Available-for-sale, Gross Unrealized Losses | 184 |
Available-for-sale, Fair Value | 28,021 | 33,778
Mortgage-backed Securities, U.S. Government agencies |  |
Investment Securities |  |
Available-for-sale, Amortized Cost | 1,563 | 1,790
Available-for-sale, Gross Unrealized Gains | 9 | 53
Available-for-sale, Gross Unrealized Losses | 1 |
Available-for-sale, Fair Value | 1,571 | 1,843
Held-to-maturity, Amortized Cost | 18,511 | 18,802
Held-to-maturity, Gross Unrealized Losses | 1,315 | 392
Held-to-maturity, Fair value | 17,196 | 18,410
Mortgage-backed Securities, U.S. Government-sponsored enterprises |  |
Investment Securities |  |
Available-for-sale, Amortized Cost | 105,652 | 109,018
Available-for-sale, Gross Unrealized Gains | 50 | 939
Available-for-sale, Gross Unrealized Losses | 9,168 | 2,925
Available-for-sale, Fair Value | 96,534 | 107,032
Held-to-maturity, Amortized Cost | 66,052 | 40,935
Held-to-maturity, Gross Unrealized Gains | 1 | 3
Held-to-maturity, Gross Unrealized Losses | 4,612 | 448
Held-to-maturity, Fair value | 61,441 | 40,490
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises |  |
Investment Securities |  |
Available-for-sale, Amortized Cost | 12,396 | 12,542
Available-for-sale, Gross Unrealized Gains | 14 | 406
Available-for-sale, Gross Unrealized Losses | 129 |
Available-for-sale, Fair Value | 12,281 | 12,948
Corporate Debt Securities |  |
Investment Securities |  |
Available-for-sale, Amortized Cost | 3,000 | 3,000
Available-for-sale, Gross Unrealized Losses | 176 | 82
Available-for-sale, Fair Value | 2,824 | 2,918
State and Municipals, Taxable |  |
Investment Securities |  |
Available-for-sale, Amortized Cost | 69,027 | 69,066
Available-for-sale, Gross Unrealized Gains | 106 | 994
Available-for-sale, Gross Unrealized Losses | 6,021 | 1,082
Available-for-sale, Fair Value | 63,112 | 68,978
State and Municipals, Tax-exempt |  |
Investment Securities |  |
Available-for-sale, Amortized Cost | 99,805 | 96,412
Available-for-sale, Gross Unrealized Gains | 505 | 2,452
Available-for-sale, Gross Unrealized Losses | 6,843 | 614
Available-for-sale, Fair Value | 93,467 | 98,250
Held-to-maturity, Amortized Cost | 11,266 | 11,476
Held-to-maturity, Gross Unrealized Gains | 30 | 126
Held-to-maturity, Gross Unrealized Losses | 653 | 56
Held-to-maturity, Fair value | $ 10,643 | $ 11,546

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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