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Debt Securities - Amortized Cost and Estimated Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Face Amount | $ 343,596 | $ 188,643
Amortized cost | 339,724 | 190,178
Gross Unrealized Gain | 9,143 | 2,313
Gross Unrealized Loss | (862) | (1,043)
Securities available-for-sale, at estimated fair value | 348,005 | 191,448
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Face Amount | 23,097 | 33,066
Amortized cost | 24,074 | 34,232
Gross Unrealized Gain | 0 | 0
Gross Unrealized Loss | (793) | (870)
Securities available-for-sale, at estimated fair value | 23,281 | 33,362
Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Face Amount | 320,499 | 155,577
Amortized cost | 315,650 | 155,946
Gross Unrealized Gain | 9,143 | 2,313
Gross Unrealized Loss | (69) | (173)
Securities available-for-sale, at estimated fair value | $ 324,724 | $ 158,086

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- Definition Available-for-sale Securities, Fair Value + References No definition available. + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + 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 (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + 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 (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + 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 Reference 1: 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 Reference 2: 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 + Details
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