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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Investment Securities
Available-for-sale, Amortized Cost	$ 332,032	$ 286,215
Available-for-sale, Gross Unrealized Gains	7,452	9,899
Available-for-sale, Gross Unrealized Losses	3,035	203
Available-for-sale, Fair Value	336,449	295,911
Held-to-maturity, Amortized Cost	7,104	7,225
Held-to-maturity, Gross Unrealized Gains	190	288
Held-to-maturity, Fair value	7,294	7,513
U.S. Treasuries
Investment Securities
Available-for-sale, Amortized Cost	16,483	18,478
Available-for-sale, Gross Unrealized Gains	260	427
Available-for-sale, Fair Value	16,743	18,905
U.S. government-sponsored enterprises state and municipals
Investment Securities
Available-for-sale, Amortized Cost	56,591	63,834
Available-for-sale, Gross Unrealized Gains	868	1,354
Available-for-sale, Fair Value	57,459	65,188
Mortgage-backed Securities, U.S. government agencies
Investment Securities
Available-for-sale, Amortized Cost	2,618	3,553
Available-for-sale, Gross Unrealized Gains	96	154
Available-for-sale, Fair Value	2,714	3,707
Held-to-maturity, Amortized Cost	16	21
Held-to-maturity, Fair value	16	21
Mortgage-backed Securities, U.S. government-sponsored enterprises
Investment Securities
Available-for-sale, Amortized Cost	108,269	79,457
Available-for-sale, Gross Unrealized Gains	1,340	1,930
Available-for-sale, Gross Unrealized Losses	1,864	136
Available-for-sale, Fair Value	107,745	81,251
Held-to-maturity, Amortized Cost	241	355
Held-to-maturity, Gross Unrealized Gains	7	13
Held-to-maturity, Fair value	248	368
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises
Investment Securities
Available-for-sale, Amortized Cost	12,581	12,619
Available-for-sale, Gross Unrealized Gains	684	881
Available-for-sale, Fair Value	13,265	13,500
Corporate debt securities
Investment Securities
Available-for-sale, Amortized Cost	3,000	1,000
Available-for-sale, Gross Unrealized Losses	36
Available-for-sale, Fair Value	2,964	1,000
State and Municipals, Taxable
Investment Securities
Available-for-sale, Amortized Cost	59,423	53,297
Available-for-sale, Gross Unrealized Gains	1,544	2,099
Available-for-sale, Gross Unrealized Losses	514	30
Available-for-sale, Fair Value	60,453	55,366
State and Municipals, Tax-exempt
Investment Securities
Available-for-sale, Amortized Cost	73,067	53,977
Available-for-sale, Gross Unrealized Gains	2,660	3,054
Available-for-sale, Gross Unrealized Losses	621	37
Available-for-sale, Fair Value	75,106	56,994
Held-to-maturity, Amortized Cost	6,847	6,849
Held-to-maturity, Gross Unrealized Gains	183	275
Held-to-maturity, Fair value	$ 7,030	$ 7,124

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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).

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