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Loans and Allowance for Losses and Concentrations of Credit Risk - Concentrations of Credit Risk (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | $ 6,867,586 | $ 6,139,304
Financing Receivables, Borrower Exposure, Range One [Member] [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 2,379,596 | 2,195,103
Financing Receivables, Borrower Exposure, Range Two [Member] [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 2,627,617 | 2,398,843
Financing Receivables, Borrower Exposure, Range Three [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 867,574 | 782,171
Financing Receivables, Borrower Exposure, Range Four [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 584,896 | 469,681
Financing Receivables, Borrower Exposure, Range Five [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 407,903 | 293,506
Financing Receivables, Original Loan-To-Value Ratio, Range One [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | $ 1,322,422 | 1,220,432
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 | $ 1,733,671 | 1,466,047
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 | $ 2,385,605 | 2,078,099
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 | $ 1,150,914 | 1,167,395
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 | $ 248,799 | 191,664
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 | $ 26,175 | 15,667
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 | $ 740,991 | 657,403
Southwest [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 2,093,213 | 1,791,745
Mid-North [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 2,244,094 | 2,104,867
Mid-South [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 908,603 | 837,121
Northeast [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 296,264 | 229,679
Southeast [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 584,421 | 518,489
Crops [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 3,657,945 | 3,410,498
Permanent Plantings [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 1,367,563 | 1,037,440
Livestock [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 1,334,958 | 1,305,844
Part-Time Farm [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 433,628 | 324,074
Agriculture Storage and Processing [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | 58,761 | 48,051
Other Commodity [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Gross | $ 14,731 | $ 13,397

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