Loans and Allowance for Credit Losses - Amortized Cost and Unpaid Principal of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	$ 1,720,091		$ 1,501,785
Allowance for credit losses	(16,491)	$ (15,645)	(13,838)	$ (11,982)	$ (11,537)	$ (11,739)
Net loans	1,703,600		1,487,947
Unpaid Principal	1,728,377		1,510,395
Difference	(8,286)		(8,610)
Commercial & industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	415,898		358,128
Allowance for credit losses	(3,453)	(3,418)	(2,914)	(2,897)	(2,961)	(3,027)
Unpaid Principal	417,695		359,900
Difference	(1,797)		(1,772)
Commercial real estate | Owner occupied properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	357,455		349,973
Allowance for credit losses	(2,792)	(2,807)	(3,094)	(2,760)	(2,573)	(3,176)
Unpaid Principal	359,019		351,580
Difference	(1,564)		(1,607)
Commercial real estate | Non-owner occupied and multifamily properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	506,256		482,270
Allowance for credit losses	(3,224)	(3,260)	(3,615)	(3,227)	(3,107)	(2,930)
Unpaid Principal	509,939		486,021
Difference	(3,683)		(3,751)
Residential real estate | 1-4 family residential properties secured by first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	180,849		73,381
Allowance for credit losses	(3,540)	(3,206)	(1,413)	(698)	(620)	(439)
Unpaid Principal	180,719		73,674
Difference	130		(293)
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	27,535		20,259
Allowance for credit losses	(506)	(423)	(389)	(366)	(327)	(215)
Unpaid Principal	27,342		20,103
Difference	193		156
Residential real estate | 1-4 family residential construction loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	32,185		44,000
Allowance for credit losses	(175)	(206)	(312)	(281)	(231)	(120)
Unpaid Principal	32,374		44,314
Difference	(189)		(314)
Other construction, land development and raw land loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	119,716		99,182
Allowance for credit losses	(2,476)	(1,996)	(1,803)	(1,477)	(1,462)	(1,635)
Unpaid Principal	120,909		100,075
Difference	(1,193)		(893)
Obligations of states and political subdivisions in the US
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	30,463		32,539
Allowance for credit losses	(77)	(88)	(79)	(63)	(59)	(32)
Unpaid Principal	30,465		32,540
Difference	(2)		(1)
Agricultural production, including commercial fishing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	40,923		34,099
Allowance for credit losses	(164)	(162)	(145)	(140)	(127)	(91)
Unpaid Principal	41,143		34,263
Difference	(220)		(164)
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	5,986		4,335
Allowance for credit losses	(79)	(74)	(68)	(66)	(64)	(67)
Unpaid Principal	5,930		4,293
Difference	56		42
Other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost	2,825		3,619
Allowance for credit losses	(5)	$ (5)	(6)	$ (7)	$ (6)	$ (7)
Unpaid Principal	2,842		3,632
Difference	$ (17)		$ (13)