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Business Segment Reporting - Core Earnings - Business Segments (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Operating Segments |  |  |  |  |  |  |  |  | 4 |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net interest income | $ 41,283 | $ 39,562 | $ 39,731 | $ 37,071 | $ 36,713 | $ 35,563 | $ 34,358 | $ 33,640 | $ 157,647 | $ 140,274 | $ 125,807
Less: reconciling adjustments(1)(2)(3) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Effective Spread |  |  |  |  |  |  |  |  | 0 | 0 | 0
Guaranty Fee Income | 3,484 | 3,314 | 3,472 | 3,844 | 3,789 | 3,798 | 3,655 | 3,626 | 14,114 | 14,868 | 14,077
Other Non-Interest Income (Expense), Excluding Guarantee and Commitment Fees |  |  |  |  |  |  |  |  | 3,398 | 5,600 | 6,064
Non-interest income | 2,673 | 4,299 | 3,744 | 6,796 | 19,307 | 4,101 | (234) | (2,706) | 17,512 | 20,468 | 20,141
Provision for loan losses | (474) | (270) | (327) | (637) | (461) | (191) | (364) | (49) | (1,708) | (1,065) | (2,388)
Provision for Other Credit Losses |  |  |  |  |  |  |  |  | (50) | 63 | 2,180
Noninterest Expense, Excluding Loan, Lease and Other Losses |  |  |  |  |  |  |  |  | (42,715) | (40,383) | (37,662)
Non-interest expense | (10,210) | (10,616) | (11,390) | (10,549) | (10,977) | (9,303) | (10,074) | (9,966) | (42,765) | (40,320) | (35,482)
Income Tax Expense (Benefit) | (13,266) | (11,193) | (11,124) | (10,786) | (15,793) | (10,529) | (8,400) | (7,335) | (46,369) | (42,057) | (34,239)
Net income | 20,006 | 21,782 | 20,634 | 21,895 | 28,789 | 19,641 | 15,286 | 13,584 | 84,317 | 77,300 | 73,839
Net income | 33,272 | 32,975 | 31,758 | 32,681 | 44,582 | 30,170 | 23,686 | 20,919 | 130,686 | 119,357 | 108,078
Preferred Stock Dividends, Income Statement Impact | (3,296) | (3,295) | (3,296) | (3,295) | (3,296) | (3,295) | (3,296) | (3,295) | (13,182) | (13,182) | (13,182)
Less: Net loss/(income) attributable to non-controlling interest | 0 | 0 | 150 | 15 | (28) | 18 | 16 | 28 | 165 | 34 | (5,139)
Preferred Stock Redemption Premium |  |  |  |  |  |  |  |  | 0 | 0 | 8,147
Net Income (Loss) Available to Common Stockholders, Basic | 16,710 | $ 18,487 | $ 17,488 | $ 18,615 | 25,465 | $ 16,364 | $ 12,006 | $ 10,317 | 71,300 | 64,152 | 47,371
Segment Reporting Information, Additional Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total Assets | 17,792,274 |  |  |  | 15,606,020 |  |  |  | 17,792,274 | 15,606,020 | 15,540,354
On and Off Balance Sheet Program Assets, At Principal Balance | 19,007,311 |  |  |  | 17,399,475 |  |  |  | 19,007,311 | 17,399,475 | 15,898,820
Farm & Ranch [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | 54,290 | 47,219 | 43,271
Less: reconciling adjustments(1)(2)(3) |  |  |  |  |  |  |  |  | (8,922) | (7,729) | (5,308)
Net Effective Spread |  |  |  |  |  |  |  |  | 45,368 | 39,490 | 37,963
Guaranty Fee Income |  |  |  |  |  |  |  |  | 17,175 | 15,542 | 15,076
Other Non-Interest Income (Expense), Excluding Guarantee and Commitment Fees |  |  |  |  |  |  |  |  | 2,449 | 539 | 1,039
Non-interest income |  |  |  |  |  |  |  |  | 19,624 | 16,081 | 16,115
Provision for loan losses |  |  |  |  |  |  |  |  | (1,708) | (1,065) | (2,388)
Provision for Other Credit Losses |  |  |  |  |  |  |  |  | (50) | 63 | 2,180
Noninterest Expense, Excluding Loan, Lease and Other Losses |  |  |  |  |  |  |  |  | (16,554) | (16,206) | (16,876)
Non-interest expense |  |  |  |  |  |  |  |  | (16,604) | (16,143) | (14,696)
Segment core earnings before income taxes |  |  |  |  |  |  |  |  | 46,680 | 38,363 | 36,994
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (16,338) | (13,428) | (12,956)
Segment core earnings before preferred stock dividends and attibution of income to non-controlling interest - preferred stock dividends |  |  |  |  |  |  |  |  | 30,342 | 24,935 | 24,038
Preferred Stock Dividends, Income Statement Impact |  |  |  |  |  |  |  |  | 0 | 0 | 0
Less: Net loss/(income) attributable to non-controlling interest |  |  |  |  |  |  |  |  | 0 | 0 | 0
Preferred Stock Redemption Premium |  |  |  |  |  |  |  |  |  |  | 0
Segment core earnings |  |  |  |  |  |  |  |  | 30,342 | 24,935 | 24,038
Segment Reporting Information, Additional Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total Assets | 4,274,693 |  |  |  | 3,582,098 |  |  |  | 4,274,693 | 3,582,098 | 3,041,386
On and Off Balance Sheet Program Assets, At Principal Balance | 6,867,586 |  |  |  | 6,139,304 |  |  |  | 6,867,586 | 6,139,304 | 5,725,299
USDA Guarantees [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | 21,106 | 21,865 | 17,750
Less: reconciling adjustments(1)(2)(3) |  |  |  |  |  |  |  |  | (2,287) | (3,210) | (638)
Net Effective Spread |  |  |  |  |  |  |  |  | 18,819 | 18,655 | 17,112
Guaranty Fee Income |  |  |  |  |  |  |  |  | 456 | 101 | 17
Other Non-Interest Income (Expense), Excluding Guarantee and Commitment Fees |  |  |  |  |  |  |  |  | 43 | 222 | 100
Non-interest income |  |  |  |  |  |  |  |  | 499 | 323 | 117
Provision for loan losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Provision for Other Credit Losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Noninterest Expense, Excluding Loan, Lease and Other Losses |  |  |  |  |  |  |  |  | (4,384) | (4,200) | (3,449)
Non-interest expense |  |  |  |  |  |  |  |  | (4,384) | (4,200) | (3,449)
Segment core earnings before income taxes |  |  |  |  |  |  |  |  | 14,934 | 14,778 | 13,780
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (5,227) | (5,173) | (4,826)
Segment core earnings before preferred stock dividends and attibution of income to non-controlling interest - preferred stock dividends |  |  |  |  |  |  |  |  | 9,707 | 9,605 | 8,954
Preferred Stock Dividends, Income Statement Impact |  |  |  |  |  |  |  |  | 0 | 0 | 0
Less: Net loss/(income) attributable to non-controlling interest |  |  |  |  |  |  |  |  | 0 | 0 | 0
Preferred Stock Redemption Premium |  |  |  |  |  |  |  |  |  |  | 0
Segment core earnings |  |  |  |  |  |  |  |  | 9,707 | 9,605 | 8,954
Segment Reporting Information, Additional Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total Assets | 2,195,189 |  |  |  | 2,096,503 |  |  |  | 2,195,189 | 2,096,503 | 1,977,609
On and Off Balance Sheet Program Assets, At Principal Balance | 2,352,214 |  |  |  | 2,094,375 |  |  |  | 2,352,214 | 2,094,375 | 1,918,277
Rural Utilities [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | 11,598 | 11,739 | 11,728
Less: reconciling adjustments(1)(2)(3) |  |  |  |  |  |  |  |  | (539) | (1,771) | (723)
Net Effective Spread |  |  |  |  |  |  |  |  | 11,059 | 9,968 | 11,005
Guaranty Fee Income |  |  |  |  |  |  |  |  | 1,914 | 1,694 | 397
Other Non-Interest Income (Expense), Excluding Guarantee and Commitment Fees |  |  |  |  |  |  |  |  | 20 | 2 | 25
Non-interest income |  |  |  |  |  |  |  |  | 1,934 | 1,696 | 422
Provision for loan losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Provision for Other Credit Losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Noninterest Expense, Excluding Loan, Lease and Other Losses |  |  |  |  |  |  |  |  | (2,430) | (2,856) | (3,364)
Non-interest expense |  |  |  |  |  |  |  |  | (2,430) | (2,856) | (3,364)
Segment core earnings before income taxes |  |  |  |  |  |  |  |  | 10,563 | 8,808 | 8,063
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (3,696) | (3,083) | (2,828)
Segment core earnings before preferred stock dividends and attibution of income to non-controlling interest - preferred stock dividends |  |  |  |  |  |  |  |  | 6,867 | 5,725 | 5,235
Preferred Stock Dividends, Income Statement Impact |  |  |  |  |  |  |  |  | 0 | 0 | 0
Less: Net loss/(income) attributable to non-controlling interest |  |  |  |  |  |  |  |  | 0 | 0 | 0
Preferred Stock Redemption Premium |  |  |  |  |  |  |  |  |  |  | 0
Segment core earnings |  |  |  |  |  |  |  |  | 6,867 | 5,725 | 5,235
Segment Reporting Information, Additional Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total Assets | 1,088,986 |  |  |  | 1,012,014 |  |  |  | 1,088,986 | 1,012,014 | 1,019,279
On and Off Balance Sheet Program Assets, At Principal Balance | 1,882,633 |  |  |  | 1,878,110 |  |  |  | 1,882,633 | 1,878,110 | 1,530,990
Institutional Credit [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | 59,842 | 48,756 | 44,971
Less: reconciling adjustments(1)(2)(3) |  |  |  |  |  |  |  |  | (3,505) | (3,184) | (1,512)
Net Effective Spread |  |  |  |  |  |  |  |  | 56,337 | 45,572 | 43,459
Guaranty Fee Income |  |  |  |  |  |  |  |  | 805 | 1,833 | 1,665
Other Non-Interest Income (Expense), Excluding Guarantee and Commitment Fees |  |  |  |  |  |  |  |  | 0 | 0 | 0
Non-interest income |  |  |  |  |  |  |  |  | 805 | 1,833 | 1,665
Provision for loan losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Provision for Other Credit Losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Noninterest Expense, Excluding Loan, Lease and Other Losses |  |  |  |  |  |  |  |  | (6,439) | (3,786) | (2,109)
Non-interest expense |  |  |  |  |  |  |  |  | (6,439) | (3,786) | (2,109)
Segment core earnings before income taxes |  |  |  |  |  |  |  |  | 50,703 | 43,619 | 43,015
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (17,746) | (15,265) | (15,038)
Segment core earnings before preferred stock dividends and attibution of income to non-controlling interest - preferred stock dividends |  |  |  |  |  |  |  |  | 32,957 | 28,354 | 27,977
Preferred Stock Dividends, Income Statement Impact |  |  |  |  |  |  |  |  | 0 | 0 | 0
Less: Net loss/(income) attributable to non-controlling interest |  |  |  |  |  |  |  |  | 0 | 0 | 0
Preferred Stock Redemption Premium |  |  |  |  |  |  |  |  |  |  | 0
Segment core earnings |  |  |  |  |  |  |  |  | 32,957 | 28,354 | 27,977
Segment Reporting Information, Additional Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total Assets | 7,627,749 |  |  |  | 6,008,574 |  |  |  | 7,627,749 | 6,008,574 | 5,420,195
On and Off Balance Sheet Program Assets, At Principal Balance | 7,904,878 |  |  |  | 7,287,686 |  |  |  | 7,904,878 | 7,287,686 | 6,724,254
Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | 10,811 | 10,695 | 8,087
Less: reconciling adjustments(1)(2)(3) |  |  |  |  |  |  |  |  | (1,091) | (1,308) | (198)
Net Effective Spread |  |  |  |  |  |  |  |  | 9,720 | 9,387 | 7,889
Guaranty Fee Income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other Non-Interest Income (Expense), Excluding Guarantee and Commitment Fees |  |  |  |  |  |  |  |  | 171 | 1,322 | 74
Non-interest income |  |  |  |  |  |  |  |  | 171 | 1,322 | 74
Provision for loan losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Provision for Other Credit Losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Noninterest Expense, Excluding Loan, Lease and Other Losses |  |  |  |  |  |  |  |  | (12,908) | (13,335) | (11,864)
Non-interest expense |  |  |  |  |  |  |  |  | (12,908) | (13,335) | (11,864)
Segment core earnings before income taxes |  |  |  |  |  |  |  |  | (3,017) | (2,626) | (3,901)
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 1,792 | 636 | 3,053
Segment core earnings before preferred stock dividends and attibution of income to non-controlling interest - preferred stock dividends |  |  |  |  |  |  |  |  | (1,225) | (1,990) | (848)
Preferred Stock Dividends, Income Statement Impact |  |  |  |  |  |  |  |  | (13,182) | (13,182) | (13,182)
Less: Net loss/(income) attributable to non-controlling interest |  |  |  |  |  |  |  |  | 165 | 34 | (5,139)
Preferred Stock Redemption Premium |  |  |  |  |  |  |  |  |  |  | 0
Segment core earnings |  |  |  |  |  |  |  |  | (14,242) | (15,138) | (19,169)
Segment Reporting Information, Additional Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total Assets | 2,605,657 |  |  |  | 2,906,831 |  |  |  | 2,605,657 | 2,906,831 | 4,081,885
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Less: reconciling adjustments(1)(2)(3) |  |  |  |  |  |  |  |  | 16,344 | 17,202 | 8,379
Net Effective Spread |  |  |  |  |  |  |  |  | 16,344 | 17,202 | 8,379
Guaranty Fee Income |  |  |  |  |  |  |  |  | (6,236) | (4,302) | (3,078)
Other Non-Interest Income (Expense), Excluding Guarantee and Commitment Fees |  |  |  |  |  |  |  |  | 715 | 3,515 | 4,826
Non-interest income |  |  |  |  |  |  |  |  | (5,521) | (787) | 1,748
Provision for loan losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Provision for Other Credit Losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Noninterest Expense, Excluding Loan, Lease and Other Losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Non-interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Segment core earnings before income taxes |  |  |  |  |  |  |  |  | 10,823 | 16,415 | 10,127
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (5,154) | (5,744) | (1,644)
Segment core earnings before preferred stock dividends and attibution of income to non-controlling interest - preferred stock dividends |  |  |  |  |  |  |  |  | 5,669 | 10,671 | 8,483
Preferred Stock Dividends, Income Statement Impact |  |  |  |  |  |  |  |  | 0 | 0 | 0
Less: Net loss/(income) attributable to non-controlling interest |  |  |  |  |  |  |  |  | 0 | 0 | 0
Preferred Stock Redemption Premium |  |  |  |  |  |  |  |  |  |  | 8,147
Segment core earnings |  |  |  |  |  |  |  |  | 5,669 | 10,671 | 336
Segment Reporting Information, Additional Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total Assets | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
On and Off Balance Sheet Program Assets, At Principal Balance | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 | $ 0

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- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details
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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1377-109256 + Details
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- Definition Total aggregate amount of all noninterest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders. + References No definition available. + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details
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- Definition Amount of expense related to loss from loan transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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