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Loans and Allowance for Losses and Concentrations of Credit Risk - Concentrations of Credit Risk (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | $ 7,072,018 | $ 6,867,586
Financing Receivables, Borrower Exposure, Range One [Member] [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 2,423,394 | 2,379,596
Financing Receivables, Borrower Exposure, Range Two [Member] [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 2,696,431 | 2,627,617
Financing Receivables, Borrower Exposure, Range Three [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 917,198 | 867,574
Financing Receivables, Borrower Exposure, Range Four [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 587,618 | 584,896
Financing Receivables, Borrower Exposure, Range Five [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 447,377 | 407,903
Financing Receivables, Original Loan-To-Value Ratio, Range One [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 1,317,118 | 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 |  | 1,769,124 | 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 |  | 2,456,766 | 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 |  | 1,227,092 | 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 |  | 277,204 | 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 |  | 24,714 | 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 |  | 815,346 | 740,991
Southwest [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 2,198,744 | 2,093,213
Mid-North [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 2,276,100 | 2,244,094
Mid-South [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 876,960 | 908,603
Northeast [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 315,685 | 296,264
Southeast [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 589,183 | 584,421
Crops [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 3,746,077 | 3,657,945
Permanent Plantings [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 1,400,976 | 1,367,563
Livestock [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 1,353,141 | 1,334,958
Part-Time Farm [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 484,227 | 433,628
Agriculture Storage and Processing [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | 79,475 | 58,761
Other Commodity [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Gross |  | $ 8,122 | $ 14,731

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