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Investment Securities - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Investment Securities [Line Items] |  |  |  |  |
Other-than-temporary impairment charge |  |  | $ 0 |  | $ 0
Impairment charges on securities in continuous unrealized loss position for 12 months or longer | 0 |  | 0 |  | 0
Net realized gain (loss) on redemption or sale of investment securities | 67,000 | 611,000 | 1,852,000 | 923,000 |
Recognized in earnings resulting from the redemption of investment securities | 23,000 | 899,000 | 498,000 | 2,400,000 |
Investment securities available-for-sale, carrying values | 1,128,624,000 |  | 1,128,624,000 |  | 530,926,000
Collateralized mortgage obligations [Member] |  |  |  |  |
Investment Securities [Line Items] |  |  |  |  |
Investment securities available-for-sale, carrying values | 196,211,000 |  | 196,211,000 |  | 127,693,000
Mortgage-backed securities [Member] |  |  |  |  |
Investment Securities [Line Items] |  |  |  |  |
Investment securities available-for-sale, carrying values | 584,157,000 |  | 584,157,000 |  | 217,059,000
Mortgage-backed securities [Member] | Collateralized mortgage obligations [Member] |  |  |  |  |
Investment Securities [Line Items] |  |  |  |  |
contractual maturities |  |  | 2064 |  |
Securities Pledged as Collateral [Member] |  |  |  |  |
Investment Securities [Line Items] |  |  |  |  |
Investment securities available-for-sale, carrying values | $ 79,900,000 |  | $ 79,900,000 |  | $ 47,600,000

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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for twelve months or longer. + References No definition available. + Details
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- Definition Investment Maturity Date End + References No definition available. + Details
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- Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560 + Details
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- Definition Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities and unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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