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Debt Securities - Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Feb. 28, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Total, Face Amount | $ 674,883 |  | $ 699,190
Total, Amortized Cost | 665,906 |  | 688,509
Total, Gross Unrealized Gain | 5,752 |  | 7,322
Total, Gross Unrealized Loss | (5,374) |  | (1,713)
Total, Carrying Value | 666,284 |  | 694,118
Commercial Mortgage Backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Face Amount |  |  | 17,013
Amortized cost |  | $ 24,038 | 17,783
Gross Unrealized Gain |  |  | 0
Gross Unrealized Loss |  |  | (678)
Carrying Value/Estimated Fair Value |  |  | 17,105
Held to Maturity, Face Amount | 154,000 |  | 155,000
Held to Maturity, Amortized Cost | 153,799 |  | 154,283
Held to Maturity, Gross Unrealized Gain | 0 |  | 0
Held to Maturity, Gross Unrealized Loss | 0 |  | 0
Held to Maturity, Carrying Value | 153,799 |  | 154,283
Commercial Mortgage Backed Securities [Member] | Estimated Fair Value [Member] | Available-for-sale Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Face Amount | 520,883 |  | 527,177
Amortized cost | 512,107 |  | 516,443
Gross Unrealized Gain | 5,752 |  | 7,322
Gross Unrealized Loss | (5,374) |  | (1,035)
Carrying Value/Estimated Fair Value | $ 512,485 |  | $ 522,730

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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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