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Debt Securities - Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Feb. 28, 2015
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Total, Face Amount | $ 657,634 | $ 664,732 |
Total, Amortized Cost | 651,081 | 657,446 |
Total, Gross Unrealized Gain | 1,575 | 2,614 |
Total, Gross Unrealized Loss | (27,741) | (13,718) |
Total, Carrying Value | 624,915 | 646,342 |
Commercial Mortgage Backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized cost |  |  | $ 24,038
Held to Maturity, Face Amount | 152,500 | 153,250 |
Held to Maturity, Amortized Cost | 152,451 | 153,193 |
Held to Maturity, Gross Unrealized Gain | 0 | 0 |
Held to Maturity, Gross Unrealized Loss | 0 | 0 |
Held to Maturity, Carrying Value | 152,451 | 153,193 |
Commercial Mortgage Backed Securities [Member] | Estimated Fair Value [Member] | Available-for-sale Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Face Amount | 505,134 | 511,482 |
Amortized cost | 498,630 | 504,253 |
Gross Unrealized Gain | 1,575 | 2,614 |
Gross Unrealized Loss | (27,741) | (13,718) |
Carrying Value/Estimated Fair Value | $ 472,464 | $ 493,149 |

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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