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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 3,643 | $ 4,358
Amortized cost one to five years | 49,198 | 49,415
Amortized cost for five to ten years | 106,225 | 98,551
Amortized cost for after ten years | 62,120 | 61,313
Total amortized cost | 221,186 | 213,637
Total available for sale investment securities, Amortized Cost | 508,427 | 463,306
Within one year, amortized cost | 9,910 |
One to five years, amortized cost |  |
Total held to maturity investment securities, amortized cost | 9,910 |
Fair value within one year | 3,663 | 4,368
Fair value for one to five years | 49,627 | 50,673
Fair value for five to ten years | 107,424 | 104,258
Fair value for after ten years | 61,051 | 65,436
Total fair value | 221,765 | 224,735
Investment securities, available for sale | 508,591 | 482,801
Within one year, fair value | 9,910 |
One to five years, fair value |  |
Held-to-maturity, fair value | 9,910 | 0
Federal agency collateralized mortgage obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 116,047 | 95,337
Investment securities, available for sale | 114,706 | 96,831
Federal agency mortgage-backed pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 170,006 | 152,372
Investment securities, available for sale | 170,894 | 159,204
Private labeled mortgage-backed pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 1,188 | 1,960
Investment securities, available for sale | $ 1,226 | $ 2,031

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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + 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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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second rolling twelve months through the fifth rolling twelve months following the latest balance sheet presented. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References No definition available. + Details
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