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Accounting Policies - Changes in Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax | $ 3,536 |  | $ 4,225 |  | $ 31,863 |  | $ 57,610 |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
AOCI Beginning Balance | 42,428 |  | 12,384 |  | 33,758 |  | (11,019) |
Other comprehensive income/(loss) before reclassifications | 2,201 |  | 3,273 |  | 19,189 |  | 32,310 |
Amounts reclassified from AOCI | (3,834) |  | (2,093) |  | (12,152) |  | (7,727) |
Net other comprehensive income/(loss) | (1,633) |  | 1,180 |  | 7,037 |  | 24,583 |
AOCI Ending Balance | 40,795 |  | 13,564 |  | 40,795 |  | 13,564 |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax | 1,238 |  | 1,479 |  | 11,152 |  | 20,164 |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax | 2,298 |  | 2,746 |  | 20,711 |  | 37,446 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 400 |  | 500 |  | 1,400 |  | 1,500 |
Other Comprehensive Income (Loss), before Tax | (2,512) |  | 1,815 |  | 10,826 |  | 37,821 |
Other Comprehensive Income (Loss), Tax | (879) |  | 635 |  | 3,789 |  | 13,238 |
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
AOCI Beginning Balance | (1,276) |  | 19,704 |  | (14,387) |  | (10,035) |
Other comprehensive income/(loss) before reclassifications | 2,298 |  | 2,746 |  | 20,711 |  | 37,446 |
Amounts reclassified from AOCI | (2,875) |  | (2,388) |  | (8,177) |  | (7,349) |
Net other comprehensive income/(loss) | (577) |  | 358 |  | 12,534 |  | 30,097 |
AOCI Ending Balance | (1,853) |  | 20,062 |  | (1,853) |  | 20,062 |
Other Comprehensive Income (Loss), before Tax | (886) |  | 552 |  | 19,283 |  | 46,305 |
Other Comprehensive Income (Loss), Tax | (309) |  | 194 |  | 6,749 |  | 16,208 |
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Held-to-maturity Securities [Member] |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
AOCI Beginning Balance | 42,104 |  | (1,781) |  | 45,752 |  | (476) |
Other comprehensive income/(loss) before reclassifications | 0 |  | 0 |  | 0 |  | 0 |
Amounts reclassified from AOCI | (1,221) |  | (47) |  | (4,869) |  | (1,352) |
Net other comprehensive income/(loss) | (1,221) |  | (47) |  | (4,869) |  | (1,352) |
AOCI Ending Balance | 40,883 |  | (1,828) |  | 40,883 |  | (1,828) |
Other Comprehensive Income (Loss), before Tax | (1,879) |  | (73) |  | (7,491) |  | (2,081) |
Other Comprehensive Income (Loss), Tax | (658) |  | (26) |  | (2,622) |  | (729) |
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
AOCI Beginning Balance | 1,600 |  | (5,539) |  | 2,393 |  | (508) |
Other comprehensive income/(loss) before reclassifications | (97) |  | 527 |  | (1,522) |  | (5,136) |
Amounts reclassified from AOCI | 262 |  | 342 |  | 894 |  | 974 |
Net other comprehensive income/(loss) | 165 |  | 869 |  | (628) |  | (4,162) |
AOCI Ending Balance | 1,765 |  | (4,670) |  | 1,765 |  | (4,670) |
Other Comprehensive Income (Loss), before Tax | 253 |  | 1,336 |  | (966) |  | (6,403) |
Other Comprehensive Income (Loss), Tax | 88 |  | 467 |  | (338) |  | (2,241) |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (150) |  | 810 |  | (2,342) |  | (7,901) |
Other Comprehensive Income (Loss) before Reclassifications, Tax | (53) |  | 283 |  | (820) |  | (2,765) |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gain (Loss) on Derivative Instruments [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Amounts reclassified from AOCI | (2,812) | [1] | (2,374) | [1] | (8,105) | [2] | (7,535) | [2]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (4,326) | [1] | (3,652) | [1] | (12,470) | [2] | (11,591) | [2]
Reclassification from AOCI, Current Period, Tax | (1,514) | [1] | (1,278) | [1] | (4,365) | [2] | (4,056) | [2]
Reclassification out of Accumulated Other Comprehensive Income [Member] | Other Income [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Amounts reclassified from AOCI | (5) | [3] | (14) | [3] | (14) | [4] | 180 | [4]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (7) | [3] | (21) | [3] | (21) | [4] | 277 | [4]
Reclassification from AOCI, Current Period, Tax | (2) | [3] | (7) | [3] | (7) | [4] | 97 | [4]
Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Income [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Held-to-maturity Securities [Member] |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Amounts reclassified from AOCI | (1,221) | [5] | (47) | [5] | (4,869) | [6] | (1,352) | [6]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (1,879) | [5] | (73) | [5] | (7,491) | [6] | (2,081) | [6]
Reclassification from AOCI, Current Period, Tax | (658) | [5] | (26) | [5] | (2,622) | [6] | (729) | [6]
Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Expense [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Amounts reclassified from AOCI | 262 | [7] | 342 | [7] | 894 | [8] | 974 | [8]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 403 | [7] | 526 | [7] | 1,376 | [8] | 1,498 | [8]
Reclassification from AOCI, Current Period, Tax | 141 | [7] | 184 | [7] | 482 | [8] | 524 | [8]
Reclassification out of Accumulated Other Comprehensive Income [Member] | Gain (Loss) on Investments [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Amounts reclassified from AOCI | (58) | [3] | 0 | [3] | (58) | [9] | 6 | [9]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (89) |  | 0 |  | (89) | [9] | 9 | [9]
Reclassification from AOCI, Current Period, Tax | $ (31) |  | $ 0 |  | $ (31) | [9] | $ 3 | [9]
[1] | (1) Relates to the amortization of unrealized gains on hedged items prior to the application of fair value hedge accounting.
[2] | Relates to the amortization of unrealized gains on hedged items prior to the application of fair value hedge accounting.
[3] | Represents amortization of deferred gains related to certain available-for-sale USDA Securities and Farmer Mac Guaranteed USDA Securities.
[4] | Represents amortization of deferred gains related to certain available-for-sale USDA Securities and Farmer Mac Guaranteed USDA Securities.
[5] | Relates to the amortization of unrealized gains or losses prior to the reclassification of these securities from available-for-sale to held-to-maturity. The amortization of unrealized gains or losses reported in AOCI for held-to-maturity securities will be offset by the amortization of the premium or discount created from the transfer into held-to-maturity securities, which occurred at fair value. These unrealized gains or losses will be recorded over the remaining life of the security with no impact on future net income.
[6] | Relates to the amortization of unrealized gains or losses prior to the reclassification of these securities from available-for-sale to held-to-maturity. The amortization of unrealized gains or losses reported in AOCI for held-to-maturity securities will be offset by the amortization of the premium or discount created from the transfer into held-to-maturity securities, which occurred at fair value. These unrealized gains or losses will be recorded over the remaining life of the security with no impact on future net income.
[7] | Relates to the recognition of unrealized gains and losses on cash flow hedges recorded in AOCI.
[8] | Relates to the recognition of unrealized gains and losses on cash flow hedges recorded in AOCI.
[9] | Represents unrealized losses on sales of available-for-sale investment securities.

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