Loans and Allowance for Credit Losses - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) Alternative Loan_modified	Dec. 31, 2021 USD ($) Loan_modified	Dec. 31, 2020 USD ($)	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (decrease) in accounts and notes receivable	$ 828,700,000
Accrued interest on loans	23,000,000.0	$ 14,700,000
Minimum value of loans individually measured for impairment	$ 250,000,000
Number of alternatives for measuring impaired loans receivable | Alternative	3
Allowance for credit losses	$ 59,093,000	54,655,000	$ 41,910,000		$ 26,911,000
Recorded balance of nonaccrual loans	15,956,000	18,105,000
Interest lost on nonaccrual loans	103,000	308,000	921,000
Troubled debt restructurings balance	5,064,000	5,792,000
Loans receivable, modifications, allowance	$ 500,000	$ 800,000
Troubled debt restructurings balance | Loan_modified	2	1
Real estate acquired through foreclosure	$ 4,261,000	$ 4,984,000
Mortgage loans secured by real estate In foreclosure	$ 425,000	411,000
ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses				$ 28,583,000
ASU 2016-13 | Revision of Prior Period, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses				1,672,000
ASU 2016-13 | Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses				1,198,000
ASU 2016-13 | Financial Asset Acquired with Credit Deterioration | Revision of Prior Period, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses				833,000
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Debt coverage ratio	1.20x
Amortization period of loans	twenty years
Recorded balance of nonaccrual loans	$ 7,640,000	7,920,000
Commercial Real Estate | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses				11,739,000
Commercial Real Estate | ASU 2016-13 | Revision of Prior Period, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses				541,000
Commercial Real Estate | ASU 2016-13 | Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses				818,000
Commercial Real Estate | ASU 2016-13 | Financial Asset Acquired with Credit Deterioration | Revision of Prior Period, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses				459,000
Commercial Real Estate | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum loan-to-value ratio (in hundredths)	65.00%
Commercial Real Estate | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum loan-to-value ratio (in hundredths)	80.00%
1-4 Family Residential Properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period when loans charged-down	180 days
Recorded balance of nonaccrual loans	$ 4,943,000	5,252,000
1-4 Family Residential Properties | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses				2,142,000
1-4 Family Residential Properties | ASU 2016-13 | Revision of Prior Period, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses				756,000
1-4 Family Residential Properties | ASU 2016-13 | Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses				48,000
1-4 Family Residential Properties | ASU 2016-13 | Financial Asset Acquired with Credit Deterioration | Revision of Prior Period, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses				$ 42,000
Jefferson Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans acquired amount	426,400,000
Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings balance	$ 4,435,000	4,953,000
Unsecured Open-end Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period when loans charged-down	180 days
Other Secured Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period when loans charged-down	120 days
Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum loan-to-value ratio (in hundredths)	65.00%
Amortization period of loans	twenty-five years
Loans receivable, time period	one year
Agricultural | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	$ 1,433,000	1,257,000	1,084,000		1,093,000
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum loan-to-value ratio (in hundredths)	80.00%
Amortization period of loans	seven years
Loans receivable, time period	one year
Allowance for credit losses	$ 20,808,000	19,241,000	$ 13,485,000		$ 9,273,000
Troubled debt restructurings balance	$ 591,000	$ 479,000
Residential Properties | Real Estate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum loan-to-value ratio (in hundredths)	80.00%
Amortization period of loans	twenty-five years
Balloon period	five years