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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 | Mar. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 4,449 | $ 3,643
Amortized cost one to five years | 43,451 | 49,198
Amortized cost for five to ten years | 111,942 | 106,225
Amortized cost for after ten years | 58,764 | 62,120
Total amortized cost | 218,606 | 221,186
Total available for sale investment securities, Amortized Cost | 514,839 | 508,427
Within one year, amortized cost | 9,910 | 9,910
One to five years, amortized cost |  |
Total held to maturity investment securities, amortized cost | 9,910 | 9,910
Fair value within one year | 4,486 | 3,663
Fair value for one to five years | 43,959 | 49,627
Fair value for five to ten years | 114,654 | 107,424
Fair value for after ten years | 58,866 | 61,051
Total fair value | 221,965 | 221,765
Investment securities, available for sale | 519,430 | 508,591
Within one year, fair value | 9,910 | 9,910
One to five years, fair value |  |
Held-to-maturity, fair value | 9,910 | 9,910
Federal agency collateralized mortgage obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 115,584 | 116,047
Investment securities, available for sale | 114,836 | 114,706
Federal agency mortgage-backed pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 179,625 | 170,006
Investment securities, available for sale | 181,573 | 170,894
Private labeled mortgage-backed pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 1,024 | 1,188
Investment securities, available for sale | $ 1,056 | $ 1,226

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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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