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Debt Securities - Amortized Cost and Estimated Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Commercial Mortgage Backed Securities [Member] | Dec. 31, 2012 Commercial Mortgage Backed Securities [Member] | Mar. 31, 2012 Commercial Mortgage Backed Securities [Member] | Jun. 30, 2012 Commercial Mortgage Backed Securities [Member] Hilton Commercial Mortgage Backed Securities [Member] | Dec. 31, 2013 Commercial Mortgage Backed Securities [Member] Portion at Fair Value Measurement [Member] | Dec. 31, 2012 Commercial Mortgage Backed Securities [Member] Portion at Fair Value Measurement [Member] AAA Commercial Mortage Backed Securities [Member] | Dec. 31, 2012 Commercial Mortgage Backed Securities [Member] Portion at Fair Value Measurement [Member] Hilton Commercial Mortgage Backed Securities [Member]
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |
Face Amount | $ 188,643 | $ 273,343 | $ 33,066 | $ 65,410 |  | $ 74,854 | $ 155,577 | $ 134,694 | $ 73,239
Amortized cost | 190,178 | 273,713 | 34,232 | 67,109 | 137,423 |  | 155,946 | 136,354 | 70,250
Gross Unrealized Gain | 2,313 | 5,621 | 0 | 249 |  |  | 2,313 | 2,061 | 3,311
Gross Unrealized Loss | (1,043) | (446) | (870) | (279) |  |  | (173) | (167) | 0
Securities available-for-sale, at estimated fair value | $ 191,448 | $ 278,888 | $ 33,362 | $ 67,079 |  |  | $ 158,086 | $ 138,248 | $ 73,561

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- Definition Available-for-sale Debt Securities, Face Amount + References No definition available. + Details
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- Definition Available-for-sale Securities, Gross Unrealized Gain1 + References No definition available. + Details
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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 No definition available. + Details
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