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Loans and Allowance for Loan Losses - Additional Information (Details) | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) alternative | Jun. 30, 2019 USD ($) | Mar. 31, 2020 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Accrued interest on loans | $ 14,100,000 |  |  |  | $ 12,400,000 |  |
Minimum value of loans individually measured for impairment | $ 250,000 |  |  |  |  |  |
Number of alternatives for measuring impaired loans receivable | alternative | 3 |  |  |  |  |  |
Allowance for credit losses | $ 38,381,000 | $ 26,359,000 | $ 32,876,000 |  | 26,911,000 | $ 26,704,000 | $ 26,189,000
Financing receivable modifications performing recorded investment | 2,656,000 | 2,800,000 |  |  | 2,701,000 |  |
Interest lost on nonaccrual loans | 1,044,000 | 1,335,000 |  |  |  |  |
Troubled debt restructurings balance | 6,839,000 |  |  |  | 5,803,000 |  |
Loans receivable, modifications, allowance | 239,000 |  |  |  | 381,000 |  |
Real estate acquired through foreclosure | 2,256,000 |  |  |  | 3,644,000 |  |
Mortgage loans secured by real estate In foreclosure | 1,146,000 |  |  |  | 667,000 |  |
Financial Asset, Equal to or Greater than 90 Days Past Due |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Troubled debt restructurings balance | $ 0 |  |  |  | 0 |  |
Financial Asset Acquired with Credit Deterioration |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses |  |  |  |  | 365,000 |  |
Financing receivable, allowance for credit losses reversed |  |  |  |  | 1,229,000 |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses |  |  |  | $ 28,583,000 |  |  |
Accounting Standards Update 2016-13 | Impact of ASU |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses |  |  |  | 1,672,000 |  |  |
Accounting Standards Update 2016-13 | Financial Asset Acquired with Credit Deterioration |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses |  |  |  | 1,198,000 |  |  |
Accounting Standards Update 2016-13 | Financial Asset Acquired with Credit Deterioration | Impact of ASU |  |  |  |  |  |  |
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 | 20 years |  |  |  |  |  |
Commercial Real Estate | Accounting Standards Update 2016-13 |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses |  |  |  | 11,739,000 |  |  |
Commercial Real Estate | Accounting Standards Update 2016-13 | Impact of ASU |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses |  |  |  | 541,000 |  |  |
Commercial Real Estate | Accounting Standards Update 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 | Accounting Standards Update 2016-13 | Financial Asset Acquired with Credit Deterioration | Impact of ASU |  |  |  |  |  |  |
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 |  |  |  |  |  |
1-4 Family Residential Properties | Accounting Standards Update 2016-13 |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses |  |  |  | 2,142,000 |  |  |
1-4 Family Residential Properties | Accounting Standards Update 2016-13 | Impact of ASU |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses |  |  |  | 756,000 |  |  |
1-4 Family Residential Properties | Accounting Standards Update 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 | Accounting Standards Update 2016-13 | Financial Asset Acquired with Credit Deterioration | Impact of ASU |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses |  |  |  | $ 42,000 |  |  |
Motels and Hotels Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | $ 126,500,000 |  |  |  |  |  |
Non-residential Buildings |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 401,500,000 |  |  |  |  |  |
Residential Buildings and Dwellings |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 293,700,000 |  |  |  |  |  |
Nursing Care Facilities |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 117,400,000 |  |  |  |  |  |
Other Gambling Industries |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 124,900,000 |  |  |  |  |  |
Real Estate Loan |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Financing receivable modifications performing recorded investment | 2,484,000 |  |  |  | 2,528,000 |  |
Troubled debt restructurings balance | $ 3,716,000 |  |  |  | 3,651,000 |  |
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 | $ 400,800,000 |  |  |  | 376,400,000 |  |
Increase (decrease) in accounts and notes receivable | $ 24,400,000 |  |  |  |  |  |
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 | $ 330,500,000 |  |  |  | 301,500,000 |  |
Increase (decrease) in accounts and notes receivable | 29,000,000.0 |  |  |  |  |  |
Agricultural | Real Estate Loan |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses | $ 1,634,000 | 1,284,000 | 1,335,000 |  | 1,093,000 | 1,282,000 | 1,246,000
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 | $ 12,360,000 | $ 9,129,000 | $ 11,294,000 |  | 9,273,000 | $ 10,830,000 | $ 9,893,000
Financing receivable modifications performing recorded investment | 81,000 |  |  |  | 128,000 |  |
Troubled debt restructurings balance | $ 2,673,000 |  |  |  | $ 1,349,000 |  |
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 |  |  |  |  |  |
Balloon period | five years |  |  |  |  |  |

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