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Loans and Allowance for Credit Losses - Additional Information (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2022 USD ($) alternative Loan_modified | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) Loan_modified | Dec. 31, 2020 USD ($) | Jan. 01, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Accrued interest on loans | $ 15,200,000 |  | $ 14,700,000 |  |
Minimum value of loans individually measured for impairment | $ 250,000 |  |  |  |
Number of alternatives for measuring impaired loans receivable | alternative | 3 |  |  |  |
Allowance for credit losses | $ 58,474,000 | $ 55,418,000 | 54,655,000 | $ 41,910,000 |
Interest lost on nonaccrual loans | 95,000 | 154,000 |  |  |
Troubled debt restructurings balance | 5,450,000 |  | 5,792,000 |  |
Loans receivable, modifications, allowance | $ 581,000 |  | $ 765,000,000,000 |  |
Troubled debt restructurings balance | Loan_modified | 3 |  | 1 |  |
Real estate acquired through foreclosure | $ 4,794,000 |  | $ 4,984,000 |  |
Mortgage loans secured by real estate In foreclosure | $ 410,000 |  | 411,000 |  |
Accounting Standards Update 2016-13 | Financial Asset Acquired with Credit Deterioration | Restatement Adjustment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for credit losses |  |  |  |  | $ 833,000
Maximum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Amortization period of loans | 25 years |  |  |  |
Commercial Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Debt coverage ratio | 1.20x |  |  |  |
Commercial Real Estate | Minimum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Maximum loan-to-value ratio (in hundredths) | 65.00% |  |  |  |
Amortization period of loans | 20 years |  |  |  |
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 |  |  |  |
Motels and Hotels Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | $ 208,800,000 |  |  |  |
Non-residential Buildings |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 874,100,000 |  |  |  |
Residential Buildings and Dwellings |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 537,700,000 |  |  |  |
Real Estate Loan |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Troubled debt restructurings balance | $ 4,704,000 |  | 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] |  |  |  |  |
Gross loans | $ 402,700,000 |  | 430,800,000 |  |
Increase (decrease) in accounts and notes receivable | $ (28,100,000) |  |  |  |
Maximum loan-to-value ratio (in hundredths) | 65.00% |  |  |  |
Amortization period of loans | 25 years |  |  |  |
Loans receivable, time period | 1 year |  |  |  |
Agricultural | Corn and Other Grain Farming |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | $ 283,600,000 |  | 297,400,000 |  |
Increase (decrease) in accounts and notes receivable | (13,800,000) |  |  |  |
Agricultural | Real Estate Loan |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for credit losses | $ 1,971,000 | 1,628,000 | 1,257,000 | 1,084,000 |
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 | 7 years |  |  |  |
Loans receivable, time period | 1 year |  |  |  |
Allowance for credit losses | $ 17,348,000 | $ 18,954,000 | 19,241,000 | $ 13,485,000 |
Troubled debt restructurings balance | $ 459,000 |  | $ 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 | 25 years |  |  |  |

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