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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, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost within one year | $ 19,958 | $ 13,347
Amortized cost one to five years | 34,822 | 40,468
Amortized cost for five to ten years | 96,035 | 50,473
Amortized cost for after ten years | 36,441 | 63,306
Total amortized cost | 187,256 | 167,594
Total available for sale investment securities, Amortized Cost | 558,786 | 513,602
Within one year, amortized cost | 5,646 | 1,948
One to five years, amortized cost | 48,383 | 40,603
Five to ten years, amortized cost | 102,816 | 89,801
After ten years, amortized cost | 47,774 | 47,484
Total amortized cost | 204,619 | 179,836
Total held to maturity investment securities, amortized cost | 223,848 | 200,448
Fair value within one year | 19,861 | 13,326
Fair value for one to five years | 34,019 | 40,193
Fair value for five to ten years | 94,103 | 51,156
Fair value for after ten years | 35,676 | 64,326
Total fair value | 183,659 | 169,001
Investment securities, available for sale | 542,305 | 509,665
Within one year, fair value | 5,628 | 1,934
One to five years, fair value | 48,788 | 41,531
five to ten years, fair value | 101,199 | 91,249
After ten years, fair value | 44,809 | 45,683
Total fair value | 200,424 | 180,397
Held-to-maturity, Fair Value | 219,158 | 201,085
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 178,069 | 132,871
Total held to maturity investment securities, amortized cost | 5,262 | 5,734
Investment securities, available for sale | 172,671 | 130,365
Held-to-maturity, Fair Value | 5,083 | 5,682
Federal Agency Mortgage-backed Pools [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 193,461 | 211,487
Total held to maturity investment securities, amortized cost | 13,967 | 14,878
Investment securities, available for sale | 185,975 | 208,657
Held-to-maturity, Fair Value | $ 13,651 | 15,006
Private Labeled Mortgage-backed Pools [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total available for sale investment securities, Amortized Cost |  | 1,650
Investment securities, available for sale |  | $ 1,642

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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