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Loans and Allowance for Credit Losses - Additional Information (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) alternative Loan_modified | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) Loan_modified
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accrued interest on loans | $ 16,900,000 |  | $ 14,700,000
Minimum value of loans individually measured for impairment | $ 250,000 |  |
Number of alternatives for measuring impaired loans receivable | alternative | 3 |  |
Interest lost on nonaccrual loans | $ 94,000 | $ 319,000 |
Troubled debt restructurings balance | 5,012,000 |  | 5,792,000
Loans receivable, modifications, allowance | $ 497,000 |  | $ 765,000
Troubled debt restructurings balance | Loan_modified | 2 |  | 1
Real estate acquired through foreclosure | $ 4,209,000 |  | $ 4,984,000
Mortgage loans secured by real estate In foreclosure | $ 417,000 |  | 411,000
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 | $ 203,000,000.0 |  |
Non-residential Buildings |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 902,000,000.0 |  |
Residential Buildings and Dwellings |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 494,500,000 |  |
Real Estate Loan |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Troubled debt restructurings balance | $ 4,489,000 |  | 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 | $ 492,600,000 |  | 430,800,000
Increase (decrease) in accounts and notes receivable | $ 61,800,000 |  |
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 | $ 366,600,000 |  | 297,400,000
Increase (decrease) in accounts and notes receivable | $ 69,200,000 |  |
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 |  |
Troubled debt restructurings balance | $ 313,000 |  | $ 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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- Definition The ratio used to analyze the amount of debt that can be supported by the cash flow generated from the property. The calculation is the net income generated by the property divided by the commercial mortgage payment. + References No definition available. + Details
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- Definition The increase (decrease) during the reporting period of the sum of amounts due within one year (or one business cycle) from customers for the credit sale of goods and services; and from note holders for outstanding loans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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