Consolidated Statements of Income and Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest and dividend income
Interest and fees on loans (includes tax-exempt income of $1,913,000 in 2023, $1,181,000 in 2022, and $1,102,000 in 2021)	$ 108,274	$ 75,805	$ 62,195
Interest on deposits with other banks	517	315	72
Interest and dividends on investments (includes tax-exempt income of $8,032,000 in 2023, $7,571,000 in 2022, and $7,644,000 in 2021)	19,383	16,915	14,814
Total interest and dividend income	128,174	93,035	77,081
Interest expense
Interest on deposits	61,004	15,359	7,314
Interest on borrowed funds	1,963	1,510	3,464
Total interest expense	62,967	16,869	10,778
Net interest income	65,207	76,166	66,303
Provision for (reduction in) credit losses - loans	1,330	1,750	(375)
Provision for (reduction in) credit losses - debt securities held to maturity	(4)	0	0
Provision for (reduction in) credit losses - off-balance sheet credit exposures	(142)	0	0
Total provision for (reduction in) credit losses	1,184	1,750	(375)
Net interest income after provision credit losses	64,023	74,416	66,678
Non-interest income
Net securities gains	0	7	23
Other operating income	2,699	2,670	2,819
Total non-interest income	15,437	16,874	19,383
Non-interest expense
Salaries and employee benefits	21,942	23,316	21,152
Occupancy expense	3,319	3,052	2,841
Furniture and equipment expense	5,391	5,058	4,788
FDIC insurance premiums	1,962	1,068	824
Amortization of identified intangibles	26	69	69
Other operating expense	11,118	11,341	12,474
Total non-interest expense	43,758	43,904	42,148
Income before income taxes	35,702	47,386	43,913
Applicable tax expense	6,184	8,396	7,644
Net income	$ 29,518	$ 38,990	$ 36,269
Basic earnings per common share (in usd per share)	$ 2.68	$ 3.56	$ 3.33
Diluted earnings per common share (in usd per share)	$ 2.66	$ 3.53	$ 3.30
Other comprehensive income (loss), net of tax
Net unrealized gain (loss) on securities available for sale	$ 5,143	$ (43,000)	$ (6,727)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of amortization	8	23	46
Net (loss) gain on cash flow hedging derivative instruments	(244)	544	4,932
Net unrecognized gain on postretirement benefits	30	168	77
Other comprehensive income (loss)	4,937	(42,265)	(1,672)
Comprehensive income (loss)	34,455	(3,275)	34,597
Fiduciary and investment management income
Non-interest income
Non-interest income	4,654	4,600	4,529
Service charges on deposit accounts
Non-interest income
Non-interest income	1,887	1,825	1,568
Mortgage origination and servicing income
Non-interest income
Non-interest income	813	1,424	5,236
Debit card income
Non-interest income
Non-interest income	$ 5,384	$ 6,348	$ 5,208