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Debt Securities - Amortized Cost and Estimated Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Face Amount | $ 171,778 | $ 188,643
Amortized cost | 173,174 | 190,178
Gross Unrealized Gain | 4,432 | 2,313
Gross Unrealized Loss | (995) | (1,043)
Securities available-for-sale, at estimated fair value | 176,611 | 191,448
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Face Amount | 25,281 | 33,066
Amortized cost | 26,364 | 34,232
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | (887) | (870)
Securities available-for-sale, at estimated fair value | 25,477 | 33,362
Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Face Amount | 146,497 | 155,577
Amortized cost | 146,810 | 155,946
Gross Unrealized Gain | 4,432 | 2,313
Gross Unrealized Loss | (108) | (173)
Securities available-for-sale, at estimated fair value | $ 151,134 | $ 158,086

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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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