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Investment in Securities (Tables) | 12 Months Ended
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Mar. 31, 2014
Investment in Securities | Investment in securities at March 31, 2013 and 2014 consists of the following:
|  | Millions of yen |
|  | 2013 |  |  | 2014 |
Trading securities |  | ¥ | 33,041 |  |  | ¥ | 16,079 |
Available-for-sale securities |  |  | 757,299 |  |  |  | 881,606 |
Held-to-maturity securities |  |  | 89,451 |  |  |  | 96,731 |
Other securities |  |  | 213,877 |  |  |  | 220,160 |
Total |  | ¥ | 1,093,668 |  |  | ¥ | 1,214,576 |
Amortized Cost Basis Amounts, Gross Unrealized Holding Gains, Gross Unrealized Holding Losses and Fair Values of Available-for-Sale Securities and Held-to-Maturity Securities in Each Major Security Type | The amortized cost basis amounts, gross unrealized holding gains, gross unrealized holding losses and fair values of available-for-sale securities and held-to-maturity securities in each major security type at March 31, 2013 and 2014 are as follows: March 31, 2013
|  | Millions of yen |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Japanese and foreign government bond securities |  | ¥ | 276,832 |  |  | ¥ | 1,906 |  |  | ¥ | (21 | ) |  | ¥ | 278,717 |
Japanese prefectural and foreign municipal bond securities |  |  | 58,571 |  |  |  | 2,519 |  |  |  | 0 |  |  |  | 61,090 |
Corporate debt securities |  |  | 193,973 |  |  |  | 3,809 |  |  |  | (947 | ) |  |  | 196,835 |
Specified bonds issued by SPEs in Japan |  |  | 64,159 |  |  |  | 116 |  |  |  | (1,031 | ) |  |  | 63,244 |
CMBS and RMBS in the U.S., and other asset-backed securities |  |  | 59,419 |  |  |  | 3,480 |  |  |  | (2,208 | ) |  |  | 60,691 |
Other debt securities |  |  | 7,367 |  |  |  | 944 |  |  |  | 0 |  |  |  | 8,311 |
Equity securities |  |  | 53,869 |  |  |  | 34,703 |  |  |  | (161 | ) |  |  | 88,411 |
|  |  | 714,190 |  |  |  | 47,477 |  |  |  | (4,368 | ) |  |  | 757,299 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Japanese government bond securities and other |  |  | 89,451 |  |  |  | 9,020 |  |  |  | 0 |  |  |  | 98,471 |
|  | ¥ | 803,641 |  |  | ¥ | 56,497 |  |  | ¥ | (4,368 | ) |  | ¥ | 855,770 |
March 31, 2014
|  | Millions of yen |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Japanese and foreign government bond securities |  | ¥ | 359,148 |  |  | ¥ | 1,230 |  |  | ¥ | (18 | ) |  | ¥ | 360,360 |
Japanese prefectural and foreign municipal bond securities |  |  | 93,927 |  |  |  | 2,913 |  |  |  | (143 | ) |  |  | 96,697 |
Corporate debt securities |  |  | 199,340 |  |  |  | 2,601 |  |  |  | (555 | ) |  |  | 201,386 |
Specified bonds issued by SPEs in Japan |  |  | 6,850 |  |  |  | 70 |  |  |  | (148 | ) |  |  | 6,772 |
CMBS and RMBS in the U.S., and other asset-backed securities |  |  | 64,789 |  |  |  | 1,883 |  |  |  | (1,041 | ) |  |  | 65,631 |
Other debt securities |  |  | 9,508 |  |  |  | 2,042 |  |  |  | 0 |  |  |  | 11,550 |
Equity securities |  |  | 87,988 |  |  |  | 51,783 |  |  |  | (561 | ) |  |  | 139,210 |
|  |  | 821,550 |  |  |  | 62,522 |  |  |  | (2,466 | ) |  |  | 881,606 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Japanese government bond securities and other |  |  | 96,731 |  |  |  | 7,305 |  |  |  | 0 |  |  |  | 104,036 |
|  | ¥ | 918,281 |  |  | ¥ | 69,827 |  |  | ¥ | (2,466 | ) |  | ¥ | 985,642 |
Information about Available-for-Sale Securities and Held-to-Maturity Securities with Gross Unrealized Losses and Length of Time Individual Securities Have Been in Continuous Unrealized Loss Position | The following table provides information about available-for-sale securities with gross unrealized losses and the length of time that individual securities have been in a continuous unrealized loss position as of March 31, 2013 and 2014, respectively: March 31, 2013
|  | Millions of yen |
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
|  | Fair value |  |  | Gross unrealized losses |  |  | Fair value |  |  | Gross unrealized losses |  |  | Fair value |  |  | Gross unrealized losses |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Japanese and foreign government bond securities |  | ¥ | 85,842 |  |  | ¥ | (21 | ) |  | ¥ | 0 |  |  | ¥ | 0 |  |  | ¥ | 85,842 |  |  | ¥ | (21 | )
Japanese prefectural and foreign municipal bond securities |  |  | 10,118 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 10,118 |  |  |  | 0 |
Corporate debt securities |  |  | 4,490 |  |  |  | (69 | ) |  |  | 16,329 |  |  |  | (878 | ) |  |  | 20,819 |  |  |  | (947 | )
Specified bonds issued by SPEs in Japan |  |  | 3,929 |  |  |  | (106 | ) |  |  | 34,226 |  |  |  | (925 | ) |  |  | 38,155 |  |  |  | (1,031 | )
CMBS and RMBS in the U.S., and other asset-backed securities |  |  | 2,142 |  |  |  | (44 | ) |  |  | 8,141 |  |  |  | (2,164 | ) |  |  | 10,283 |  |  |  | (2,208 | )
Equity securities |  |  | 1,315 |  |  |  | (142 | ) |  |  | 318 |  |  |  | (19 | ) |  |  | 1,633 |  |  |  | (161 | )
|  | ¥ | 107,836 |  |  | ¥ | (382 | ) |  | ¥ | 59,014 |  |  | ¥ | (3,986 | ) |  | ¥ | 166,850 |  |  | ¥ | (4,368 | )
March 31, 2014
|  | Millions of yen |
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
|  | Fair value |  |  | Gross unrealized losses |  |  | Fair value |  |  | Gross unrealized losses |  |  | Fair value |  |  | Gross unrealized losses |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Japanese and foreign government bond securities |  | ¥ | 140,133 |  |  | ¥ | (10 | ) |  | ¥ | 14,977 |  |  | ¥ | (8 | ) |  | ¥ | 155,110 |  |  | ¥ | (18 | )
Japanese prefectural and foreign municipal bond securities |  |  | 31,407 |  |  |  | (143 | ) |  |  | 0 |  |  |  | 0 |  |  |  | 31,407 |  |  |  | (143 | )
Corporate debt securities |  |  | 27,496 |  |  |  | (31 | ) |  |  | 10,968 |  |  |  | (524 | ) |  |  | 38,464 |  |  |  | (555 | )
Specified bonds issued by SPEs in Japan |  |  | 0 |  |  |  | 0 |  |  |  | 2,138 |  |  |  | (148 | ) |  |  | 2,138 |  |  |  | (148 | )
CMBS and RMBS in the U.S., and other asset-backed securities |  |  | 15,891 |  |  |  | (91 | ) |  |  | 2,540 |  |  |  | (950 | ) |  |  | 18,431 |  |  |  | (1,041 | )
Equity securities |  |  | 15,957 |  |  |  | (541 | ) |  |  | 99 |  |  |  | (20 | ) |  |  | 16,056 |  |  |  | (561 | )
|  | ¥ | 230,884 |  |  | ¥ | (816 | ) |  | ¥ | 30,722 |  |  | ¥ | (1,650 | ) |  | ¥ | 261,606 |  |  | ¥ | (2,466 | )
Total Other-Than-Temporary Impairment with Offset for Amount of Total Other-Than-Temporary Impairment Recognized in Other Comprehensive Income | The total other-than-temporary impairment with an offset for the amount of the total other-than-temporary impairment recognized in other comprehensive income (loss) for fiscal 2012, 2013 and 2014 are as follows:
|  | Millions of yen |
|  | 2012 |  |  | 2013 |  |  | 2014 |
Total other-than-temporary impairment losses |  | ¥ | 17,100 |  |  | ¥ | 23,180 |  |  | ¥ | 7,992 |
Portion of loss recognized in other comprehensive income (before taxes) |  |  | (630 | ) |  |  | (342 | ) |  |  | (3 | )
Net impairment losses recognized in earnings |  | ¥ | 16,470 |  |  | ¥ | 22,838 |  |  | ¥ | 7,989 |
Roll-Forwards of Amount Related to Credit Losses on Other-Than-Temporarily Impaired Debt Securities Recognized in Earnings | Roll-forwards of the amount related to credit losses on other-than-temporarily impaired debt securities recognized in earnings for fiscal 2012, 2013 and 2014 are as follows:
|  | Millions of yen |
|  | 2012 |  |  | 2013 |  |  | 2014 |
Beginning |  | ¥ | 9,022 |  |  | ¥ | 8,199 |  |  | ¥ | 7,809 |
Addition during the period: |  |  |  |  |  |  |  |  |  |  |  |
Credit loss for which an other-than-temporary impairment was not previously recognized |  |  | 3,524 |  |  |  | 110 |  |  |  | 8 |
Credit loss for which an other-than-temporary impairment was previously recognized |  |  | 320 |  |  |  | 1,171 |  |  |  | 239 |
Reduction during the period: |  |  |  |  |  |  |  |  |  |  |  |
For securities sold or redeemed |  |  | (3,530 | ) |  |  | (1,049 | ) |  |  | (3,609 | )
Due to change in intent to sell or requirement to sell |  |  | (1,137 | ) |  |  | (622 | ) |  |  | (2,456 | )
Ending |  | ¥ | 8,199 |  |  | ¥ | 7,809 |  |  | ¥ | 1,991 |
Summary of Contractual Maturities of Debt Securities Classified as Available-for-Sale Securities and Held-to-Maturity Securities | The following is a summary of the contractual maturities of debt securities classified as available-for-sale securities and held-to-maturity securities held at March 31, 2014: Available-for-sale securities held at March 31, 2014:
|  | Millions of yen |
|  | Amortized cost |  |  | Fair value |
Due within one year |  | ¥ | 195,067 |  |  | ¥ | 195,211 |
Due after one to five years |  |  | 303,126 |  |  |  | 306,286 |
Due after five to ten years |  |  | 130,614 |  |  |  | 132,370 |
Due after ten years |  |  | 104,755 |  |  |  | 108,529 |
|  | ¥ | 733,562 |  |  | ¥ | 742,396 |
Held-to-maturity securities held at March 31, 2014:
|  | Millions of yen |
|  | Amortized cost |  |  | Fair value |
Due within one year |  | ¥ | 1,422 |  |  | ¥ | 1,423 |
Due after one to five years |  |  | 5 |  |  |  | 5 |
Due after ten years |  |  | 95,304 |  |  |  | 102,608 |
|  | ¥ | 96,731 |  |  | ¥ | 104,036 |

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