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Securities Available-for-Sale (Tables) | 6 Months Ended
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Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract] |
Comparative Summary of Mortgage-Backed Securities and Other Securities Available-for-Sale | The following is a comparative summary of mortgage-backed securities and other securities available-for-sale at June 30, 2015, and December 31, 2014 (in thousands).
| June 30, 2015
|  |  | Gross |  | Gross |  | Estimated
| Amortized |  | unrealized |  | unrealized |  | fair
| cost |  | gains |  | losses |  | value
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Pass-through certificates: |  |  |  |  |  |  |  |  |  |  |
Government sponsored enterprises (GSE) | $ | 259,523 |  |  | $ | 6,710 |  |  | $ | 1,417 |  |  | $ | 264,816 |
Real estate mortgage investment conduits (REMICs): |  |  |  |  |  |  |  |  |  |  |
GSE | 348,813 |  |  | 1,081 |  |  | 8,378 |  |  | 341,516 |
Non-GSE | 844 |  |  | — |  |  | 33 |  |  | 811 |
| 609,180 |  |  | 7,791 |  |  | 9,828 |  |  | 607,143 |
Other securities: |  |  |  |  |  |  |
Equity investments-mutual funds | 329 |  |  | — |  |  | — |  |  | 329 |
Corporate bonds | 32,717 |  |  | 25 |  |  | 2 |  |  | 32,740 |
| 33,046 |  |  | 25 |  |  | 2 |  |  | 33,069 |
Total securities available-for-sale | $ | 642,226 |  |  | $ | 7,816 |  |  | $ | 9,830 |  |  | $ | 640,212 |
| December 31, 2014
|  |  | Gross |  | Gross |  | Estimated
| Amortized |  | unrealized |  | unrealized |  | fair
| cost |  | gains |  | losses |  | value
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Pass-through certificates: |  |  |  |  |  |  |  |  |  |  |
GSE | $ | 292,162 |  |  | $ | 8,309 |  |  | $ | 1,131 |  |  | $ | 299,340 |
REMICs: |  |  |  |  |  |  |  |  |  |  |
GSE | 408,328 |  |  | 1,314 |  |  | 9,192 |  |  | 400,450 |
Non-GSE | 1,060 |  |  | — |  |  | 34 |  |  | 1,026 |
| 701,550 |  |  | 9,623 |  |  | 10,357 |  |  | 700,816 |
Other securities: |  |  |  |  |  |  |
Equity investments-mutual funds | 410 |  |  | — |  |  | — |  |  | 410 |
Corporate bonds | 69,975 |  |  | 40 |  |  | 2 |  |  | 70,013 |
| 70,385 |  |  | 40 |  |  | 2 |  |  | 70,423 |
Total securities available-for-sale | $ | 771,935 |  |  | $ | 9,663 |  |  | $ | 10,359 |  |  | $ | 771,239 |
Summary of Expected Maturity Distribution of Debt Securities Available-for-Sale, Other Than Mortgage-Backed Securities | The following is a summary of the expected maturity distribution of debt securities available-for-sale, other than mortgage-backed securities, at June 30, 2015 (in thousands).
Available-for-sale | Amortized cost |  | Estimated fair value
Due in one year or less | $ | 27,627 |  |  | $ | 27,639 |
Due after one year through five years | 5,090 |  |  | 5,101 |
| $ | 32,717 |  |  | $ | 32,740 |
Gross Unrealized Losses on Mortgage-Backed Securities | Gross unrealized losses on mortgage-backed securities and corporate bonds available-for-sale, and the estimated fair value of the related securities, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position, at June 30, 2015, and December 31, 2014, were as follows (in thousands).
| June 30, 2015
| Less than 12 months |  | 12 months or more |  | Total
| Unrealized |  | Estimated |  | Unrealized |  | Estimated |  | Unrealized |  | Estimated
| losses |  | fair value |  | losses |  | fair value |  | losses |  | fair value
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Pass-through certificates: |  |  |  |  |  |  |  |  |  |  |
GSE | $ | 84 |  |  | $ | 15,157 |  |  | $ | 1,333 |  |  | $ | 56,575 |  |  | $ | 1,417 |  |  | $ | 71,732 |
REMICs: |  |  |  |  |  |  |  |  |  |  |
GSE | 18 |  |  | 16,860 |  |  | 8,360 |  |  | 187,705 |  |  | 8,378 |  |  | 204,565 |
Non-GSE | — |  |  | — |  |  | 33 |  |  | 811 |  |  | 33 |  |  | 811 |
Other securities: |  |  |  |  |  |  |  |  |  |  |
Corporate bonds | 2 |  |  | 11,605 |  |  | — |  |  | — |  |  | 2 |  |  | 11,605 |
Total | $ | 104 |  |  | $ | 43,622 |  |  | $ | 9,726 |  |  | $ | 245,091 |  |  | $ | 9,830 |  |  | $ | 288,713 |
| December 31, 2014
| Less than 12 months |  | 12 months or more |  | Total
| Unrealized |  | Estimated |  | Unrealized |  | Estimated |  | Unrealized |  | Estimated
| losses |  | fair value |  | losses |  | fair value |  | losses |  | fair value
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Pass-through certificates: |  |  |  |  |  |  |  |  |  |  |
GSE | $ | 1 |  |  | $ | 181 |  |  | $ | 1,130 |  |  | $ | 61,526 |  |  | $ | 1,131 |  |  | $ | 61,707 |
REMICs: |  |  |  |  |  |  |  |  |  |  |
GSE | 30 |  |  | 3,179 |  |  | 9,162 |  |  | 229,896 |  |  | 9,192 |  |  | 233,075 |
Non-GSE | — |  |  | — |  |  | 34 |  |  | 1,026 |  |  | 34 |  |  | 1,026 |
Other Securities: |  |  |  |  |  |  |  |  |  |  |
Corporate Bonds | 2 |  |  | 9,996 |  |  | — |  |  | — |  |  | 2 |  |  | 9,996 |
Total | $ | 33 |  |  | $ | 13,356 |  |  | $ | 10,326 |  |  | $ | 292,448 |  |  | $ | 10,359 |  |  | $ | 305,804 |

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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