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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Investment Securities
Available-for-sale, Amortized Cost	$ 460,085	$ 286,215
Available-for-sale, Gross Unrealized Gains	6,384	9,899
Available-for-sale, Gross Unrealized Losses	5,097	203
Available-for-sale, Fair Value	461,372	295,911
Held-to-maturity, Amortized Cost	32,848	7,225
Held-to-maturity, Gross Unrealized Gains	150	288
Held-to-maturity, Gross Unrealized Losses	442
Held-to-maturity, Fair value	32,556	7,513
U.S. Treasuries
Investment Securities
Available-for-sale, Amortized Cost	135,816	18,478
Available-for-sale, Gross Unrealized Gains	191	427
Available-for-sale, Gross Unrealized Losses	610
Available-for-sale, Fair Value	135,397	18,905
U.S. government-sponsored enterprises state and municipals
Investment Securities
Available-for-sale, Amortized Cost	40,969	63,834
Available-for-sale, Gross Unrealized Gains	621	1,354
Available-for-sale, Fair Value	41,590	65,188
Mortgage-backed Securities, U.S. government agencies
Investment Securities
Available-for-sale, Amortized Cost	2,087	3,553
Available-for-sale, Gross Unrealized Gains	71	154
Available-for-sale, Fair Value	2,158	3,707
Held-to-maturity, Amortized Cost	11,361	21
Held-to-maturity, Gross Unrealized Losses	195
Held-to-maturity, Fair value	11,166	21
Mortgage-backed Securities, U.S. government-sponsored enterprises
Investment Securities
Available-for-sale, Amortized Cost	109,992	79,457
Available-for-sale, Gross Unrealized Gains	1,199	1,930
Available-for-sale, Gross Unrealized Losses	2,471	136
Available-for-sale, Fair Value	108,720	81,251
Held-to-maturity, Amortized Cost	11,103	355
Held-to-maturity, Gross Unrealized Gains	4	13
Held-to-maturity, Gross Unrealized Losses	188
Held-to-maturity, Fair value	10,919	368
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises
Investment Securities
Available-for-sale, Amortized Cost	12,562	12,619
Available-for-sale, Gross Unrealized Gains	598	881
Available-for-sale, Fair Value	13,160	13,500
Corporate debt securities
Investment Securities
Available-for-sale, Amortized Cost	3,000	1,000
Available-for-sale, Gross Unrealized Losses	39
Available-for-sale, Fair Value	2,961	1,000
State and Municipals, Taxable
Investment Securities
Available-for-sale, Amortized Cost	66,535	53,297
Available-for-sale, Gross Unrealized Gains	1,315	2,099
Available-for-sale, Gross Unrealized Losses	949	30
Available-for-sale, Fair Value	66,901	55,366
State and Municipals, Tax-exempt
Investment Securities
Available-for-sale, Amortized Cost	89,124	53,977
Available-for-sale, Gross Unrealized Gains	2,389	3,054
Available-for-sale, Gross Unrealized Losses	1,028	37
Available-for-sale, Fair Value	90,485	56,994
Held-to-maturity, Amortized Cost	10,384	6,849
Held-to-maturity, Gross Unrealized Gains	146	275
Held-to-maturity, Gross Unrealized Losses	59
Held-to-maturity, Fair value	$ 10,471	$ 7,124

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- Definition

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