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Investment securities - Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Investment Securities
Available-for-sale, Amortized Cost	$ 456,469	$ 543,953
Available-for-sale, Gross Unrealized Gains		93
Available-for-sale, Gross Unrealized Losses	60,643	66,343
Available-for-sale, Fair Value	395,826	477,703
Held-to-maturity, Amortized Cost	88,211	91,179
Held-to-maturity, Gross Unrealized Gains	1	1
Held-to-maturity, Gross Unrealized Losses	14,199	14,617
Held-to-maturity, Fair value	74,013	76,563
U.S. Treasury securities
Investment Securities
Available-for-sale, Amortized Cost	197,746	199,937
Available-for-sale, Gross Unrealized Losses	18,642	19,640
Available-for-sale, Fair Value	179,104	180,297
U.S. Government-sponsored enterprises state and municipals
Investment Securities
Available-for-sale, Amortized Cost	2,605	16,955
Available-for-sale, Gross Unrealized Losses	404	585
Available-for-sale, Fair Value	2,201	16,370
State and municipals, Taxable
Investment Securities
Available-for-sale, Amortized Cost	68,391	68,946
Available-for-sale, Gross Unrealized Losses	12,029	13,588
Available-for-sale, Fair Value	56,362	55,358
State and municipals, Tax-exempt
Investment Securities
Available-for-sale, Amortized Cost	76,683	99,774
Available-for-sale, Gross Unrealized Gains		93
Available-for-sale, Gross Unrealized Losses	9,819	11,460
Available-for-sale, Fair Value	66,864	88,407
Tax-exempt state and municipals
Investment Securities
Held-to-maturity, Amortized Cost	11,219	11,237
Held-to-maturity, Gross Unrealized Gains	1	1
Held-to-maturity, Gross Unrealized Losses	788	841
Held-to-maturity, Fair value	10,432	10,397
Residential mortgage-backed securities, U.S. government agencies
Investment Securities
Available-for-sale, Amortized Cost	897	982
Available-for-sale, Gross Unrealized Losses	48	40
Available-for-sale, Fair Value	849	942
Held-to-maturity, Amortized Cost	16,360	17,304
Held-to-maturity, Gross Unrealized Losses	2,859	3,016
Held-to-maturity, Fair value	13,501	14,288
Residential mortgage-backed securities, U.S. government-sponsored enterprises
Investment Securities
Available-for-sale, Amortized Cost	94,065	141,231
Available-for-sale, Gross Unrealized Losses	18,692	20,112
Available-for-sale, Fair Value	75,373	121,119
Held-to-maturity, Amortized Cost	60,632	62,638
Held-to-maturity, Gross Unrealized Losses	10,552	10,760
Held-to-maturity, Fair value	50,080	51,878
Commercial mortgage-backed Securities, U.S. government-sponsored enterprises
Investment Securities
Available-for-sale, Amortized Cost	12,082	12,128
Available-for-sale, Gross Unrealized Losses	584	544
Available-for-sale, Fair Value	11,498	11,584
Corporate debt securities
Investment Securities
Available-for-sale, Amortized Cost	4,000	4,000
Available-for-sale, Gross Unrealized Losses	425	374
Available-for-sale, Fair Value	$ 3,575	$ 3,626

X

- 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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