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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Investment Securities
Available-for-sale, Amortized Cost	$ 453,248	$ 543,953
Available-for-sale, Gross Unrealized Gains		93
Available-for-sale, Gross Unrealized Losses	71,021	66,343
Available-for-sale, Fair Value	382,227	477,703
Held-to-maturity, Amortized Cost	86,246	91,179
Held-to-maturity, Gross Unrealized Gains		1
Held-to-maturity, Gross Unrealized Losses	17,438	14,617
Held-to-maturity, Fair value	68,808	76,563
U.S. Treasury securities
Investment Securities
Available-for-sale, Amortized Cost	197,833	199,937
Available-for-sale, Gross Unrealized Losses	18,687	19,640
Available-for-sale, Fair Value	179,146	180,297
U.S. Government-sponsored enterprises state and municipals
Investment Securities
Available-for-sale, Amortized Cost	2,542	16,955
Available-for-sale, Gross Unrealized Losses	504	585
Available-for-sale, Fair Value	2,038	16,370
State and municipals, Taxable
Investment Securities
Available-for-sale, Amortized Cost	67,866	68,946
Available-for-sale, Gross Unrealized Losses	13,879	13,588
Available-for-sale, Fair Value	53,987	55,358
State and municipals, Tax-exempt
Investment Securities
Available-for-sale, Amortized Cost	76,343	99,774
Available-for-sale, Gross Unrealized Gains		93
Available-for-sale, Gross Unrealized Losses	14,545	11,460
Available-for-sale, Fair Value	61,798	88,407
Tax-exempt state and municipals
Investment Securities
Held-to-maturity, Amortized Cost	11,210	11,237
Held-to-maturity, Gross Unrealized Gains		1
Held-to-maturity, Gross Unrealized Losses	1,304	841
Held-to-maturity, Fair value	9,906	10,397
Residential mortgage-backed securities, U.S. government agencies
Investment Securities
Available-for-sale, Amortized Cost	796	982
Available-for-sale, Gross Unrealized Losses	47	40
Available-for-sale, Fair Value	749	942
Held-to-maturity, Amortized Cost	15,752	17,304
Held-to-maturity, Gross Unrealized Losses	3,344	3,016
Held-to-maturity, Fair value	12,408	14,288
Residential mortgage-backed securities, U.S. government-sponsored enterprises
Investment Securities
Available-for-sale, Amortized Cost	91,814	141,231
Available-for-sale, Gross Unrealized Losses	22,398	20,112
Available-for-sale, Fair Value	69,416	121,119
Held-to-maturity, Amortized Cost	59,284	62,638
Held-to-maturity, Gross Unrealized Losses	12,790	10,760
Held-to-maturity, Fair value	46,494	51,878
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises
Investment Securities
Available-for-sale, Amortized Cost	12,054	12,128
Available-for-sale, Gross Unrealized Losses	578	544
Available-for-sale, Fair Value	11,476	11,584
Corporate debt securities
Investment Securities
Available-for-sale, Amortized Cost	4,000	4,000
Available-for-sale, Gross Unrealized Losses	383	374
Available-for-sale, Fair Value	$ 3,617	$ 3,626

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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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