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Loans and Allowance for Losses and Concentrations of Credit Risk - Concentrations of Credit Risk (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | $ 6,932,002 | $ 6,867,586
Financing Receivables, Borrower Exposure, Range One [Member] [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 2,404,191 | 2,379,596
Financing Receivables, Borrower Exposure, Range Two [Member] [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 2,663,554 | 2,627,617
Financing Receivables, Borrower Exposure, Range Three [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 887,986 | 867,574
Financing Receivables, Borrower Exposure, Range Four [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 571,315 | 584,896
Financing Receivables, Borrower Exposure, Range Five [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 404,956 | 407,903
Financing Receivables, Original Loan-To-Value Ratio, Range One [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | $ 1,328,529 | 1,322,422
Financing Receivables, Loan-To-Value Ratio Range, Lower Range Limit | 0.00% |
Financing Receivables, 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] |  |
Financing Receivable, Gross | $ 1,717,932 | 1,733,671
Financing Receivables, Loan-To-Value Ratio Range, Lower Range Limit | 40.01% |
Financing Receivables, 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] |  |
Financing Receivable, Gross | $ 2,395,568 | 2,385,605
Financing Receivables, Loan-To-Value Ratio Range, Lower Range Limit | 50.01% |
Financing Receivables, 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] |  |
Financing Receivable, Gross | $ 1,195,017 | 1,150,914
Financing Receivables, Loan-To-Value Ratio Range, Lower Range Limit | 60.01% |
Financing Receivables, 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] |  |
Financing Receivable, Gross | $ 269,716 | 248,799
Financing Receivables, Loan-To-Value Ratio Range, Lower Range Limit | 70.01% |
Financing Receivables, 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] |  |
Financing Receivable, Gross | $ 25,240 | 26,175
Financing Receivables, Loan-To-Value Ratio Range, Lower Range Limit | 80.01% |
Financing Receivables, Loan-To-Value Ratio Range, Upper Range Limit | 90.00% |
Northwest [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | $ 799,823 | 740,991
Southwest [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 2,096,948 | 2,093,213
Mid-North [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 2,249,763 | 2,244,094
Mid-South [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 901,231 | 908,603
Northeast [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 300,731 | 296,264
Southeast [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 583,506 | 584,421
Crops [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 3,679,822 | 3,657,945
Permanent Plantings [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 1,353,338 | 1,367,563
Livestock [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 1,347,310 | 1,334,958
Part-Time Farm [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 469,023 | 433,628
Agriculture Storage and Processing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 68,909 | 58,761
Other Commodity [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | $ 13,600 | $ 14,731

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