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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investment Securities
Available-for-sale, Amortized Cost	$ 331,807	$ 286,215
Available-for-sale, Gross Unrealized Gains	6,844	9,899
Available-for-sale, Gross Unrealized Losses	4,898	203
Available-for-sale, Fair Value	333,753	295,911
Held-to-maturity, Amortized Cost	7,166	7,225
Held-to-maturity, Gross Unrealized Gains	223	288
Held-to-maturity, Fair value	7,389	7,513
U.S. Treasuries
Investment Securities
Available-for-sale, Amortized Cost	18,481	18,478
Available-for-sale, Gross Unrealized Gains	344	427
Available-for-sale, Fair Value	18,825	18,905
U.S. government-sponsored enterprises state and municipals
Investment Securities
Available-for-sale, Amortized Cost	56,620	63,834
Available-for-sale, Gross Unrealized Gains	963	1,354
Available-for-sale, Fair Value	57,583	65,188
Mortgage-backed Securities, U.S. government agencies
Investment Securities
Available-for-sale, Amortized Cost	3,061	3,553
Available-for-sale, Gross Unrealized Gains	125	154
Available-for-sale, Fair Value	3,186	3,707
Held-to-maturity, Amortized Cost	18	21
Held-to-maturity, Fair value	18	21
Mortgage-backed Securities, U.S. government-sponsored enterprises
Investment Securities
Available-for-sale, Amortized Cost	112,501	79,457
Available-for-sale, Gross Unrealized Gains	1,363	1,930
Available-for-sale, Gross Unrealized Losses	2,855	136
Available-for-sale, Fair Value	111,009	81,251
Held-to-maturity, Amortized Cost	300	355
Held-to-maturity, Gross Unrealized Gains	9	13
Held-to-maturity, Fair value	309	368
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises
Investment Securities
Available-for-sale, Amortized Cost	12,600	12,619
Available-for-sale, Gross Unrealized Gains	677	881
Available-for-sale, Fair Value	13,277	13,500
Corporate debt securities
Investment Securities
Available-for-sale, Amortized Cost	1,500	1,000
Available-for-sale, Gross Unrealized Gains	2
Available-for-sale, Gross Unrealized Losses	13
Available-for-sale, Fair Value	1,489	1,000
State and Municipals, Taxable
Investment Securities
Available-for-sale, Amortized Cost	56,931	53,297
Available-for-sale, Gross Unrealized Gains	944	2,099
Available-for-sale, Gross Unrealized Losses	1,251	30
Available-for-sale, Fair Value	56,624	55,366
State and Municipals, Tax-exempt
Investment Securities
Available-for-sale, Amortized Cost	70,113	53,977
Available-for-sale, Gross Unrealized Gains	2,426	3,054
Available-for-sale, Gross Unrealized Losses	779	37
Available-for-sale, Fair Value	71,760	56,994
Held-to-maturity, Amortized Cost	6,848	6,849
Held-to-maturity, Gross Unrealized Gains	214	275
Held-to-maturity, Fair value	$ 7,062	$ 7,124

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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).

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