Loans and Allowance for Credit Losses - Amortized Cost and Unpaid Principal of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 1,875,907		$ 1,789,497
Allowance for credit losses	(17,694)	$ (17,533)	(17,270)	$ (15,645)	$ (14,157)	$ (13,838)
Net loans	1,858,213		1,772,227
Unpaid Principal	1,884,225		1,798,053
Difference	(8,318)		(8,556)
Commercial & industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	415,931		411,387
Allowance for credit losses	(4,047)	(4,052)	(3,438)	(3,418)	(3,080)	(2,914)
Unpaid Principal	417,858		413,293
Difference	(1,927)		(1,906)
Commercial real estate | Owner occupied properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	382,050		366,741
Allowance for credit losses	(2,963)	(2,893)	(2,867)	(2,807)	(2,778)	(3,094)
Unpaid Principal	383,832		368,357
Difference	(1,782)		(1,616)
Commercial real estate | Non-owner occupied and multifamily properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	547,488		515,528
Allowance for credit losses	(3,499)	(3,419)	(3,294)	(3,260)	(3,174)	(3,615)
Unpaid Principal	551,130		519,115
Difference	(3,642)		(3,587)
Residential real estate | 1-4 family residential properties secured by first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	222,488		203,738
Allowance for credit losses	(3,489)	(3,425)	(3,470)	(3,206)	(2,226)	(1,413)
Unpaid Principal	222,026		203,534
Difference	462		204
Residential real estate | 1-4 family residential properties secured by junior liens and revolving secured by 1-4 family first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	41,500		33,996
Allowance for credit losses	(665)	(581)	(551)	(423)	(392)	(389)
Unpaid Principal	41,258		33,783
Difference	242		213
Residential real estate | 1-4 family residential construction loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	29,281		30,976
Allowance for credit losses	(180)	(159)	(191)	(206)	(260)	(312)
Unpaid Principal	29,510		31,239
Difference	(229)		(263)
Other construction, land development and raw land loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	152,767		148,373
Allowance for credit losses	(2,526)	(2,675)	(3,127)	(1,996)	(1,925)	(1,803)
Unpaid Principal	154,009		149,788
Difference	(1,242)		(1,415)
Obligations of states and political subdivisions in the US
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	29,671		30,407
Allowance for credit losses	(100)	(105)	(80)	(88)	(106)	(79)
Unpaid Principal	29,673		30,409
Difference	(2)		(2)
Agricultural production, including commercial fishing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	45,079		41,007
Allowance for credit losses	(157)	(156)	(168)	(162)	(150)	(145)
Unpaid Principal	45,320		41,237
Difference	(241)		(230)
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	6,743		6,241
Allowance for credit losses	(61)	(60)	(81)	(74)	(61)	(68)
Unpaid Principal	6,679		6,180
Difference	64		61
Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	2,909		1,103
Allowance for credit losses	(7)	$ (8)	(3)	$ (5)	$ (5)	$ (6)
Unpaid Principal	2,930		1,118
Difference	$ (21)		$ (15)