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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 | Sep. 30, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 4,623 | $ 3,643
Amortized cost one to five years | 45,741 | 49,198
Amortized cost for five to ten years | 17,166 | 106,225
Amortized cost for after ten years | 6,601 | 62,120
Total amortized cost | 74,131 | 221,186
Total available for sale investment securities, Amortized Cost | 321,203 | 508,427
Within one year, amortized cost | 5,951 | 9,910
One to five years, amortized cost | 381 |
Five to ten years, amortized cost | 93,628 |
After ten years, amortized cost | 45,662 |
Total amortized cost | 145,622 | 9,910
Total held to maturity investment securities, amortized cost | 172,449 | 9,910
Fair value within one year | 4,670 | 3,663
Fair value for one to five years | 46,156 | 49,627
Fair value for five to ten years | 17,888 | 107,424
Fair value for after ten years | 6,755 | 61,051
Total fair value | 75,469 | 221,765
Investment securities, available for sale | 323,492 | 508,591
Within one year, fair value | 6,136 | 9,910
One to five years, fair value | 382 |
five to ten years, fair value | 95,216 |
After ten years, fair value | 46,869 |
Total fair value | 148,603 | 9,910
Held-to-maturity, Fair Value | 175,838 | 9,910
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 123,916 | 116,047
Total held to maturity investment securities, amortized cost | 4,193 |
Investment securities, available for sale | 123,128 | 114,706
Held-to-maturity, Fair Value | 4,202 |
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 122,393 | 170,006
Total held to maturity investment securities, amortized cost | 22,634 |
Investment securities, available for sale | 124,109 | 170,894
Held-to-maturity, Fair Value | 23,033 |
Private Labeled Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 763 | 1,188
Investment securities, available for sale | $ 786 | $ 1,226

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