Loans and Allowance for Loan Losses - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	$ 4,063,495,000		$ 4,063,495,000		$ 3,645,162,000
Interest receivable	32,914,000		32,914,000		39,145,000
Reversal of interest income on nonaccrual loans	10,000	$ 5,000	33,000	$ 13,000
Nonaccrual loans, no allowance	1,000,000		1,000,000		1,200,000
Collateral-dependent loans	8,700,000		8,700,000		8,500,000
Commitments to lend additional funds on Troubled Debt Restructurings (TDR)	0	$ 0	0	$ 0
Mortgage Loans in Process of Foreclosure, Amount	171,000		171,000		21,000
Accrued interest receivable on our loan portfolio	14,800,000		14,800,000		13,300,000
Commercial Real Estate Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	1,901,921,000		1,901,921,000		1,598,172,000
Owner and nonowner-occupied real estate	1,570,000,000		1,570,000,000
Loans secured by multi-family properties	307,100,000		307,100,000
Loans secured by farmland	24,800,000		$ 24,800,000
General Loan Term			20 years
1-4 Family Residential Real Estate Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	646,692,000		$ 646,692,000		651,140,000
1-4 Family Residential Real Estate Loans | Minimum
Financing Receivable, Allowance for Credit Loss [Line Items]
General Loan Term			15 years
1-4 Family Residential Real Estate Loans | Maximum
Financing Receivable, Allowance for Credit Loss [Line Items]
General Loan Term			30 years
Paycheck Protection Program
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	306,000		$ 306,000		31,000,000
Commercial loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans	$ 433,538,000		$ 433,538,000		$ 418,998,000