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Securities - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Investment Securities [Line Items] |  |  |  |  |
Other-than-temporary impairment charge |  |  | $ 0 | $ 0 | $ 0
Impairment charges on securities in continuous unrealized loss position for 12 months or longer | $ 0 |  | 0 |  | 0
Net realized gains on sales of securities | 2,048,000 | $ 67,000 | 6,144,000 | 1,852,000 |
Recognized in earnings resulting from the sale of securities | 1,200,000 | $ 23,000 | 2,000,000 | $ 498,000 |
Securities available for sale | 669,340,000 |  | 669,340,000 |  | 1,060,717,000
Collateralized mortgage obligations [Member] |  |  |  |  |
Investment Securities [Line Items] |  |  |  |  |
Securities available for sale | 116,314,000 |  | 116,314,000 |  | 188,047,000
Mortgage-backed securities [Member] |  |  |  |  |
Investment Securities [Line Items] |  |  |  |  |
Securities available for sale | 324,504,000 |  | $ 324,504,000 |  | 573,286,000
Mortgage-backed securities [Member] | Collateralized mortgage obligations [Member] |  |  |  |  |
Investment Securities [Line Items] |  |  |  |  |
Contractual maturities |  |  | 2064 |  |
Securities Pledged as Collateral [Member] |  |  |  |  |
Investment Securities [Line Items] |  |  |  |  |
Securities available for sale | $ 71,600,000 |  | $ 71,600,000 |  | $ 76,200,000

X
- 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 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=51813488&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=49167202&loc=d3e26610-111562 + 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=56944662&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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