Loans and Allowance for Credit Losses - Amortized Cost and Unpaid Principal of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 2,007,565		$ 1,789,497
Allowance for credit losses	(19,528)	$ (17,694)	(17,270)	$ (16,491)	$ (15,645)	$ (13,838)
Net loans	1,988,037		1,772,227
Unpaid Principal	2,016,311		1,798,053
Difference	(8,746)		(8,556)
Commercial & industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	414,201		411,387
Allowance for credit losses	(4,304)	(4,047)	(3,438)	(3,453)	(3,418)	(2,914)
Unpaid Principal	416,184		413,293
Difference	(1,983)		(1,906)
Commercial real estate | Owner occupied properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	410,924		366,741
Allowance for credit losses	(2,921)	(2,963)	(2,867)	(2,792)	(2,807)	(3,094)
Unpaid Principal	412,827		368,357
Difference	(1,903)		(1,616)
Commercial real estate | Non-owner occupied and multifamily properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	580,702		515,528
Allowance for credit losses	(3,772)	(3,499)	(3,294)	(3,224)	(3,260)	(3,615)
Unpaid Principal	584,302		519,115
Difference	(3,600)		(3,587)
Residential real estate | 1-4 family residential properties secured by first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	248,906		203,738
Allowance for credit losses	(4,060)	(3,489)	(3,470)	(3,540)	(3,206)	(1,413)
Unpaid Principal	248,514		203,534
Difference	392		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	45,531		33,996
Allowance for credit losses	(733)	(665)	(551)	(506)	(423)	(389)
Unpaid Principal	45,262		33,783
Difference	269		213
Residential real estate | 1-4 family residential construction loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	39,557		30,976
Allowance for credit losses	(242)	(180)	(191)	(175)	(206)	(312)
Unpaid Principal	39,794		31,239
Difference	(237)		(263)
Other construction, land development and raw land loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	183,849		148,373
Allowance for credit losses	(3,165)	(2,526)	(3,127)	(2,476)	(1,996)	(1,803)
Unpaid Principal	185,362		149,788
Difference	(1,513)		(1,415)
Obligations of states and political subdivisions in the US
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	29,586		30,407
Allowance for credit losses	(100)	(100)	(80)	(77)	(88)	(79)
Unpaid Principal	29,582		30,409
Difference	4		(2)
Agricultural production, including commercial fishing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	44,489		41,007
Allowance for credit losses	(155)	(157)	(168)	(164)	(162)	(145)
Unpaid Principal	44,719		41,237
Difference	(230)		(230)
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	7,907		6,241
Allowance for credit losses	(71)	(61)	(81)	(79)	(74)	(68)
Unpaid Principal	7,836		6,180
Difference	71		61
Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	1,913		1,103
Allowance for credit losses	(5)	$ (7)	(3)	$ (5)	$ (5)	$ (6)
Unpaid Principal	1,929		1,118
Difference	$ (16)		$ (15)