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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, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 13,347 | $ 7,455
Amortized cost one to five years | 40,468 | 37,483
Amortized cost for five to ten years | 50,473 | 21,112
Amortized cost for after ten years | 63,306 | 60,566
Total amortized cost | 167,594 | 126,616
Total available for sale investment securities, Amortized Cost | 513,602 | 445,839
Within one year, amortized cost | 1,948 |
One to five years, amortized cost | 40,603 | 24,594
Five to ten years, amortized cost | 89,801 | 87,645
After ten years, amortized cost | 47,484 | 53,368
Total amortized cost | 179,836 | 165,607
Total held to maturity investment securities, amortized cost | 200,448 | 193,194
Fair value within one year | 13,326 | 7,480
Fair value for one to five years | 40,193 | 37,479
Fair value for five to ten years | 51,156 | 20,984
Fair value for after ten years | 64,326 | 59,967
Total fair value | 169,001 | 125,910
Investment securities, available for sale | 509,665 | 439,831
Within one year, fair value | 1,934 |
One to five years, fair value | 41,531 | 25,271
five to ten years, fair value | 91,249 | 88,805
After ten years, fair value | 45,683 | 51,746
Total fair value | 180,397 | 165,822
Held-to-maturity, Fair Value | 201,085 | 194,086
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 132,871 | 139,040
Total held to maturity investment securities, amortized cost | 5,734 | 6,530
Investment securities, available for sale | 130,365 | 137,195
Held-to-maturity, Fair Value | 5,682 | 6,490
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 211,487 | 180,183
Total held to maturity investment securities, amortized cost | 14,878 | 21,057
Investment securities, available for sale | 208,657 | 176,726
Held-to-maturity, Fair Value | 15,006 | $ 21,774
Private Labeled Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 1,650 |
Investment securities, available for sale | $ 1,642 |

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