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Loans and Allowance for Losses and Concentrations of Credit Risk - Financing Receivables Credit Quality Indicators (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 0 | $ 177,033 |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  | $ 200,000 |
Financing Receivable, Gross | 7,045,397,000 |  | $ 6,867,586,000
Financing Receivable, Recorded Investment, Past Due | 43,076,000 |  | 48,444,000
Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 6,535,139,000 |  | 6,390,271,000
Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 283,718,000 |  | 256,008,000
Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 226,540,000 |  | 221,307,000
Crops [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 3,757,903,000 |  | 3,657,945,000
Financing Receivable, Recorded Investment, Past Due | 23,037,000 |  | 21,853,000
Crops [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 3,462,088,000 |  | 3,407,108,000
Crops [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 185,581,000 |  | 146,841,000
Crops [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 110,234,000 |  | 103,996,000
Permanent Plantings [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 1,391,841,000 |  | 1,367,563,000
Financing Receivable, Recorded Investment, Past Due | 8,363,000 |  | 18,833,000
Permanent Plantings [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 1,292,776,000 |  | 1,250,173,000
Permanent Plantings [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 32,124,000 |  | 49,012,000
Permanent Plantings [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 66,941,000 |  | 68,378,000
Livestock [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 1,354,863,000 |  | 1,334,958,000
Financing Receivable, Recorded Investment, Past Due | 7,739,000 |  | 3,835,000
Livestock [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 1,261,847,000 |  | 1,252,160,000
Livestock [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 59,087,000 |  | 49,856,000
Livestock [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 33,929,000 |  | 32,942,000
Part-Time Farm [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 463,988,000 |  | 433,628,000
Financing Receivable, Recorded Investment, Past Due | 3,937,000 |  | 3,923,000
Part-Time Farm [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 443,722,000 |  | 411,760,000
Part-Time Farm [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 6,768,000 |  | 10,130,000
Part-Time Farm [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 13,498,000 |  | 11,738,000
Agriculture Storage and Processing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 68,558,000 |  | 58,761,000
Financing Receivable, Recorded Investment, Past Due | 0 |  | 0
Agriculture Storage and Processing [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 67,194,000 |  | 55,746,000
Agriculture Storage and Processing [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 0 |  | 0
Agriculture Storage and Processing [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 1,364,000 |  | 3,015,000
Other Commodity [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 8,244,000 |  | 14,731,000
Financing Receivable, Recorded Investment, Past Due | 0 |  | 0
Other Commodity [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 7,512,000 |  | 13,324,000
Other Commodity [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 158,000 |  | 169,000
Other Commodity [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 574,000 |  | 1,238,000
On-balance sheet [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 4,378,958,000 |  | 4,198,733,000
Financing Receivable, Recorded Investment, Past Due | 35,744,000 |  | 47,881,000
On-balance sheet [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 4,099,028,000 |  | 3,946,946,000
On-balance sheet [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 148,916,000 |  | 119,829,000
On-balance sheet [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 131,014,000 |  | 131,958,000
On-balance sheet [Member] | Crops [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 2,490,792,000 |  | 2,412,649,000
Financing Receivable, Recorded Investment, Past Due | 17,290,000 |  | 21,702,000
On-balance sheet [Member] | Crops [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 2,315,593,000 |  | 2,274,912,000
On-balance sheet [Member] | Crops [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 109,471,000 |  | 70,063,000
On-balance sheet [Member] | Crops [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 65,728,000 |  | 67,674,000
On-balance sheet [Member] | Permanent Plantings [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 877,777,000 |  | 832,658,000
Financing Receivable, Recorded Investment, Past Due | 8,363,000 |  | 18,833,000
On-balance sheet [Member] | Permanent Plantings [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 829,733,000 |  | 771,600,000
On-balance sheet [Member] | Permanent Plantings [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 7,350,000 |  | 22,878,000
On-balance sheet [Member] | Permanent Plantings [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 40,694,000 |  | 38,180,000
On-balance sheet [Member] | Livestock [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 694,388,000 |  | 653,534,000
Financing Receivable, Recorded Investment, Past Due | 6,654,000 |  | 3,835,000
On-balance sheet [Member] | Livestock [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 651,584,000 |  | 617,527,000
On-balance sheet [Member] | Livestock [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 26,248,000 |  | 18,405,000
On-balance sheet [Member] | Livestock [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 16,556,000 |  | 17,602,000
On-balance sheet [Member] | Part-Time Farm [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 300,938,000 |  | 277,195,000
Financing Receivable, Recorded Investment, Past Due | 3,437,000 |  | 3,511,000
On-balance sheet [Member] | Part-Time Farm [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 287,055,000 |  | 260,854,000
On-balance sheet [Member] | Part-Time Farm [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 5,847,000 |  | 8,483,000
On-balance sheet [Member] | Part-Time Farm [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 8,036,000 |  | 7,858,000
On-balance sheet [Member] | Agriculture Storage and Processing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 10,496,000 |  | 13,023,000
Financing Receivable, Recorded Investment, Past Due | 0 |  | 0
On-balance sheet [Member] | Agriculture Storage and Processing [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 10,496,000 |  | 13,023,000
On-balance sheet [Member] | Agriculture Storage and Processing [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 0 |  | 0
On-balance sheet [Member] | Agriculture Storage and Processing [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 0 |  | 0
On-balance sheet [Member] | Other Commodity [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 4,567,000 |  | 9,674,000
Financing Receivable, Recorded Investment, Past Due | 0 |  | 0
On-balance sheet [Member] | Other Commodity [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 4,567,000 |  | 9,030,000
On-balance sheet [Member] | Other Commodity [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 0 |  | 0
On-balance sheet [Member] | Other Commodity [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 0 |  | 644,000
Off-balance sheet [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 2,666,439,000 |  | 2,668,853,000
Financing Receivable, Recorded Investment, Past Due | 7,332,000 |  | 563,000
Off-balance sheet [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 2,436,111,000 |  | 2,443,325,000
Off-balance sheet [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 134,802,000 |  | 136,179,000
Off-balance sheet [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 95,526,000 |  | 89,349,000
Off-balance sheet [Member] | Crops [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 1,267,111,000 |  | 1,245,296,000
Financing Receivable, Recorded Investment, Past Due | 5,747,000 |  | 151,000
Off-balance sheet [Member] | Crops [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 1,146,495,000 |  | 1,132,196,000
Off-balance sheet [Member] | Crops [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 76,110,000 |  | 76,778,000
Off-balance sheet [Member] | Crops [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 44,506,000 |  | 36,322,000
Off-balance sheet [Member] | Permanent Plantings [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 514,064,000 |  | 534,905,000
Financing Receivable, Recorded Investment, Past Due | 0 |  | 0
Off-balance sheet [Member] | Permanent Plantings [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 463,043,000 |  | 478,573,000
Off-balance sheet [Member] | Permanent Plantings [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 24,774,000 |  | 26,134,000
Off-balance sheet [Member] | Permanent Plantings [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 26,247,000 |  | 30,198,000
Off-balance sheet [Member] | Livestock [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 660,475,000 |  | 681,424,000
Financing Receivable, Recorded Investment, Past Due | 1,085,000 |  | 0
Off-balance sheet [Member] | Livestock [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 610,263,000 |  | 634,633,000
Off-balance sheet [Member] | Livestock [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 32,839,000 |  | 31,451,000
Off-balance sheet [Member] | Livestock [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 17,373,000 |  | 15,340,000
Off-balance sheet [Member] | Part-Time Farm [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 163,050,000 |  | 156,433,000
Financing Receivable, Recorded Investment, Past Due | 500,000 |  | 412,000
Off-balance sheet [Member] | Part-Time Farm [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 156,667,000 |  | 150,906,000
Off-balance sheet [Member] | Part-Time Farm [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 921,000 |  | 1,647,000
Off-balance sheet [Member] | Part-Time Farm [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 5,462,000 |  | 3,880,000
Off-balance sheet [Member] | Agriculture Storage and Processing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 58,062,000 |  | 45,738,000
Financing Receivable, Recorded Investment, Past Due | 0 |  | 0
Off-balance sheet [Member] | Agriculture Storage and Processing [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 56,698,000 |  | 42,723,000
Off-balance sheet [Member] | Agriculture Storage and Processing [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 0 |  | 0
Off-balance sheet [Member] | Agriculture Storage and Processing [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 1,364,000 |  | 3,015,000
Off-balance sheet [Member] | Other Commodity [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 3,677,000 |  | 5,057,000
Financing Receivable, Recorded Investment, Past Due | 0 |  | 0
Off-balance sheet [Member] | Other Commodity [Member] | Acceptable [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 2,945,000 |  | 4,294,000
Off-balance sheet [Member] | Other Commodity [Member] | Special Mention [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | 158,000 |  | 169,000
Off-balance sheet [Member] | Other Commodity [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Financing Receivable, Gross | $ 574,000 |  | $ 594,000

X
- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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- Definition Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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