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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 7,192 | $ 6,098
Amortized cost one to five years | 38,197 | 44,720
Amortized cost for five to ten years | 16,807 | 16,147
Amortized cost for after ten years | 17,605 | 6,598
Total amortized cost | 79,801 | 73,563
Total available for sale investment securities, Amortized Cost | 444,062 | 319,746
Within one year, amortized cost | 0 | 0
One to five years, amortized cost | 17,815 | 592
Five to ten years, amortized cost | 106,167 | 99,225
After ten years, amortized cost | 28,208 | 39,582
Total amortized cost | 152,190 | 139,399
Total held to maturity investment securities, amortized cost | 187,629 | 165,767
Fair value within one year | 7,232 | 6,169
Fair value for one to five years | 38,894 | 45,093
Fair value for five to ten years | 17,152 | 16,768
Fair value for after ten years | 17,797 | 6,790
Total fair value | 81,075 | 74,820
Investment securities, available for sale | 444,982 | 323,764
Within one year, fair value | 0 | 0
One to five years, fair value | 18,403 | 593
five to ten years, fair value | 110,026 | 101,323
After ten years, fair value | 28,976 | 40,857
Total fair value | 157,404 | 142,773
Held-to-maturity, Fair Value | 193,703 | 169,904
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 157,291 | 122,930
Total held to maturity investment securities, amortized cost | 9,051 | 4,039
Investment securities, available for sale | 156,203 | 122,860
Held-to-maturity, Fair Value | 8,954 | 4,073
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 206,970 | 122,583
Total held to maturity investment securities, amortized cost | 26,388 | 22,329
Investment securities, available for sale | 207,704 | 125,395
Held-to-maturity, Fair Value | $ 27,344 | 23,058
Private Labeled Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost |  | 670
Investment securities, available for sale |  | $ 689

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