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Fair Value Disclosures - Fair Value Measurements, Recurring and Nonrecurring (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial derivatives | $ 7,834 | $ 5,709
Financial derivatives | 105,087 | 27,385
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading | 8,913 | 9,999
Financial derivatives | 10,519 | 7,487
Total Assets at fair value | 10,122,300 | 8,209,835
Financial derivatives | 27,042 | 19,633
Total Liabilities at fair value | 27,042 | 19,633
Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading | 0 | 0
Financial derivatives | 0 | 0
Total Assets at fair value | 1,296,923 | 792,602
Financial derivatives | 51 | 188
Total Liabilities at fair value | 51 | 188
Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading | 0 | 0
Financial derivatives | 10,519 | 7,487
Total Assets at fair value | 1,654,527 | 1,414,022
Financial derivatives | 26,991 | 19,445
Total Liabilities at fair value | 26,991 | 19,445
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading | 8,913 | 9,999
Financial derivatives | 0 | 0
Total Assets at fair value | 7,170,850 | 6,003,211
Financial derivatives | 0 | 0
Total Liabilities at fair value | 0 | 0
Debt Securities | Available-for-Sale Securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 2,959,843 | 2,217,852
Debt Securities | Available-for-Sale Securities | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 1,296,923 | 792,602
Debt Securities | Available-for-Sale Securities | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 1,644,008 | 1,406,535
Debt Securities | Available-for-Sale Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 18,912 | 18,715
Farmer Mac Guaranteed Securities | Available-for-Sale Securities | Institutional Credit | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 7,143,025 | 5,974,497
Farmer Mac Guaranteed Securities | Available-for-Sale Securities | Institutional Credit | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 0 | 0
Farmer Mac Guaranteed Securities | Available-for-Sale Securities | Institutional Credit | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 0 | 0
Farmer Mac Guaranteed Securities | Available-for-Sale Securities | Institutional Credit | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 7,143,025 | 5,974,497
Farmer Mac Guaranteed Securities | Available-for-Sale Securities | USDA Guarantees | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 7,143,025 | 5,974,497
Farmer Mac Guaranteed Securities | Available-for-Sale Securities | USDA Guarantees | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 0 | 0
Farmer Mac Guaranteed Securities | Available-for-Sale Securities | USDA Guarantees | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 0 | 0
Farmer Mac Guaranteed Securities | Available-for-Sale Securities | USDA Guarantees | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 7,143,025 | 5,974,497
USDA Securities: | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading | 8,913 | 9,999
USDA Securities: | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading | 0 | 0
USDA Securities: | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading | 0 | 0
USDA Securities: | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading | 8,913 | 9,999
Floating Interest Rate | Floating rate auction-rate certificates backed by Government guaranteed student loans | Available-for-Sale Securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 18,912 | 18,715
Floating Interest Rate | Floating rate auction-rate certificates backed by Government guaranteed student loans | Available-for-Sale Securities | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 0 | 0
Floating Interest Rate | Floating rate auction-rate certificates backed by Government guaranteed student loans | Available-for-Sale Securities | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 0 | 0
Floating Interest Rate | Floating rate auction-rate certificates backed by Government guaranteed student loans | Available-for-Sale Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 18,912 | 18,715
Floating Interest Rate | Floating rate asset-backed securities | Available-for-Sale Securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 11,085 | 28,678
Floating Interest Rate | Floating rate asset-backed securities | Available-for-Sale Securities | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 0 | 0
Floating Interest Rate | Floating rate asset-backed securities | Available-for-Sale Securities | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 11,085 | 28,678
Floating Interest Rate | Floating rate asset-backed securities | Available-for-Sale Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 0 | 0
Floating Interest Rate | Government/GSE Guaranteed Mortgage Backed Securities | Available-for-Sale Securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 1,632,583 | 1,377,454
Floating Interest Rate | Government/GSE Guaranteed Mortgage Backed Securities | Available-for-Sale Securities | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 0 | 0
Floating Interest Rate | Government/GSE Guaranteed Mortgage Backed Securities | Available-for-Sale Securities | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 1,632,583 | 1,377,454
Floating Interest Rate | Government/GSE Guaranteed Mortgage Backed Securities | Available-for-Sale Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 0 | 0
Fixed Interest Rate | Government/GSE Guaranteed Mortgage Backed Securities | Available-for-Sale Securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 340 | 403
Fixed Interest Rate | Government/GSE Guaranteed Mortgage Backed Securities | Available-for-Sale Securities | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 0 | 0
Fixed Interest Rate | Government/GSE Guaranteed Mortgage Backed Securities | Available-for-Sale Securities | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 340 | 403
Fixed Interest Rate | Government/GSE Guaranteed Mortgage Backed Securities | Available-for-Sale Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 0 | 0
Fixed Interest Rate | Fixed rate U.S. Treasuries | Available-for-Sale Securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 1,296,923 | 792,602
Fixed Interest Rate | Fixed rate U.S. Treasuries | Available-for-Sale Securities | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 1,296,923 | 792,602
Fixed Interest Rate | Fixed rate U.S. Treasuries | Available-for-Sale Securities | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | 0 | 0
Fixed Interest Rate | Fixed rate U.S. Treasuries | Available-for-Sale Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment securities fair value | $ 0 | $ 0

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