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Loans and Allowance for Losses - Schedule of Concentrations of Risk by Risk Factor (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | $ 7,393,728 | $ 7,233,971
Less than $1,000,000 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 2,436,975 | 2,431,296
$1,000,000 to $4,999,999 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 2,731,458 | 2,755,996
$5,000,000 to $9,999,999 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 957,901 | 916,422
$10,000,000 to $24,999,999 [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 644,231 | 601,349
$25,000,000 and greater [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 623,163 | 528,908
Financing Receivables, Original Loan-To-Value Ratio, Range One [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | $ 1,332,719 | 1,333,790
Loan-to-value ratio range, lower range limit | 0.00% |
Loan-to-value ratio range, upper range limit | 40.00% |
Financing Receivables, Original Loan-To-Value Ratio, Range Two [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | $ 1,864,787 | 1,811,166
Loan-to-value ratio range, lower range limit | 40.01% |
Loan-to-value ratio range, upper range limit | 50.00% |
Financing Receivables, Original Loan-To-Value Ratio, Range Three [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | $ 2,557,798 | 2,530,484
Loan-to-value ratio range, lower range limit | 50.01% |
Loan-to-value ratio range, upper range limit | 60.00% |
Financing Receivables, Original Loan-To-Value Ratio, Range Four [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | $ 1,300,301 | 1,244,823
Loan-to-value ratio range, lower range limit | 60.01% |
Loan-to-value ratio range, upper range limit | 70.00% |
Financing Receivables, Original Loan-To-Value Ratio, Range Five [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | $ 318,671 | 289,427
Loan-to-value ratio range, lower range limit | 70.01% |
Loan-to-value ratio range, upper range limit | 80.00% |
Financing Receivables, Original Loan-To-Value Ratio, Range Six [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | $ 19,452 | 24,281
Loan-to-value ratio range, lower range limit | 80.01% |
Loan-to-value ratio range, upper range limit | 90.00% |
Crops [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | $ 3,795,614 | 3,771,627
Permanent Plantings [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 1,614,897 | 1,509,821
Livestock [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 1,391,679 | 1,355,372
Part-Time Farm [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 508,260 | 504,138
Agriculture Storage and Processing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 78,941 | 85,181
Other Commodity [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 4,337 | 7,832
Northwest [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 850,862 | 855,596
Southwest [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 2,417,144 | 2,273,184
Mid-North [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 2,297,159 | 2,296,073
Mid-South [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 917,889 | 883,279
Northeast [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | 325,674 | 332,370
Southeast [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross financing receivables | $ 585,000 | $ 593,469

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