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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 8,277 | $ 7,455
Amortized cost one to five years | 40,343 | 37,483
Amortized cost for five to ten years | 28,390 | 21,112
Amortized cost for after ten years | 64,880 | 60,566
Total amortized cost | 141,890 | 126,616
Total available for sale investment securities, Amortized Cost | 477,670 | 445,839
Within one year, amortized cost | 9,941 |
One to five years, amortized cost | 30,869 | 24,594
Five to ten years, amortized cost | 86,470 | 87,645
After ten years, amortized cost | 49,351 | 53,368
Total amortized cost | 176,631 | 165,607
Total held to maturity investment securities, amortized cost | 198,868 | 193,194
Fair value within one year | 8,311 | 7,480
Fair value for one to five years | 40,404 | 37,479
Fair value for five to ten years | 28,380 | 20,984
Fair value for after ten years | 65,345 | 59,967
Total fair value | 142,440 | 125,910
Investment securities, available for sale | 474,222 | 439,831
Within one year, fair value | 9,941 |
One to five years, fair value | 31,892 | 25,271
five to ten years, fair value | 87,885 | 88,805
After ten years, fair value | 48,282 | 51,746
Total fair value | 178,000 | 165,822
Held-to-maturity, Fair Value | 200,482 | 194,086
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 137,815 | 139,040
Total held to maturity investment securities, amortized cost | 6,297 | 6,530
Investment securities, available for sale | 136,189 | 137,195
Held-to-maturity, Fair Value | 6,262 | 6,490
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 196,064 | 180,183
Total held to maturity investment securities, amortized cost | 15,940 | 21,057
Investment securities, available for sale | 193,711 | 176,726
Held-to-maturity, Fair Value | 16,220 | $ 21,774
Private Labeled Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 1,901 |
Investment securities, available for sale | $ 1,882 |

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