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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 9,772 | $ 7,455
Amortized cost one to five years | 44,771 | 37,483
Amortized cost for five to ten years | 44,163 | 21,112
Amortized cost for after ten years | 61,316 | 60,566
Total amortized cost | 160,022 | 126,616
Total available for sale investment securities, Amortized Cost | 510,445 | 445,839
Within one year, amortized cost | 7,383 |
One to five years, amortized cost | 37,402 | 24,594
Five to ten years, amortized cost | 88,399 | 87,645
After ten years, amortized cost | 44,289 | 53,368
Total amortized cost | 177,473 | 165,607
Total held to maturity investment securities, amortized cost | 198,605 | 193,194
Fair value within one year | 9,784 | 7,480
Fair value for one to five years | 44,811 | 37,479
Fair value for five to ten years | 44,851 | 20,984
Fair value for after ten years | 62,315 | 59,967
Total fair value | 161,761 | 125,910
Investment securities, available for sale | 509,844 | 439,831
Within one year, fair value | 7,373 |
One to five years, fair value | 38,645 | 25,271
five to ten years, fair value | 90,371 | 88,805
After ten years, fair value | 44,471 | 51,746
Total fair value | 180,860 | 165,822
Held-to-maturity, fair value | 202,222 | 194,086
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 135,511 | 139,040
Total held to maturity investment securities, amortized cost | 5,902 | 6,530
Investment securities, available for sale | 134,202 | 137,195
Held-to-maturity, fair value | 5,896 | 6,490
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 213,071 | 180,183
Total held to maturity investment securities, amortized cost | 15,230 | 21,057
Investment securities, available for sale | 212,051 | 176,726
Held-to-maturity, fair value | 15,466 | $ 21,774
Private Labeled Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 1,841 |
Investment securities, available for sale | $ 1,830 |

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