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Loans and Allowance for Losses - Schedule of Concentrations of Risk by Risk Factor (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | $ 7,776,950 | $ 7,233,971
Less than $1,000,000 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 2,455,109 | 2,431,296
$1,000,000 to $4,999,999 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 2,812,060 | 2,755,996
$5,000,000 to $9,999,999 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 1,003,021 | 916,422
$10,000,000 to $24,999,999 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 773,658 | 601,349
$25,000,000 and greater |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 733,102 | 528,908
0.00% to 40.00% |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | $ 1,418,075 | 1,333,790
Loan-to-value ratio range, lower range limit | 0.00% |
Loan-to-value ratio range, upper range limit | 40.00% |
40.01% to 50.00% |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | $ 2,008,307 | 1,811,166
Loan-to-value ratio range, lower range limit | 40.01% |
Loan-to-value ratio range, upper range limit | 50.00% |
50.01% to 60.00% |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | $ 2,616,272 | 2,530,484
Loan-to-value ratio range, lower range limit | 50.01% |
Loan-to-value ratio range, upper range limit | 60.00% |
60.01% to 70.00% |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | $ 1,385,116 | 1,244,823
Loan-to-value ratio range, lower range limit | 60.01% |
Loan-to-value ratio range, upper range limit | 70.00% |
70.01% to 80.00% |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | $ 329,979 | 289,427
Loan-to-value ratio range, lower range limit | 70.01% |
Loan-to-value ratio range, upper range limit | 80.00% |
80.01% to 90.00% |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | $ 19,201 | 24,281
Loan-to-value ratio range, lower range limit | 80.01% |
Loan-to-value ratio range, upper range limit | 90.00% |
Crops |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | $ 3,930,858 | 3,771,627
Permanent Plantings |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 1,727,261 | 1,509,821
Livestock |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 1,502,887 | 1,355,372
Part-time Farm |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 532,065 | 504,138
Ag. Storage and Processing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 76,466 | 85,181
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 7,413 | 7,832
Northwest |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 982,222 | 855,596
Southwest |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 2,573,691 | 2,273,184
Mid-North |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 2,358,592 | 2,296,073
Mid-South |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 947,544 | 883,279
Northeast |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 321,794 | 332,370
Southeast |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | $ 593,107 | $ 593,469

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