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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, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 29,589 | $ 20,532
Amortized cost one to five years | 52,250 | 42,476
Amortized cost for five to ten years | 100,190 | 107,839
Amortized cost for after ten years | 95,233 | 67,020
Total amortized cost | 277,262 | 237,867
Total available for sale investment securities, Amortized Cost | 684,023 | 608,909
Within one year, amortized cost | 150 | 70
One to five years, amortized cost | 50,317 | 48,732
Five to ten years, amortized cost | 99,413 | 101,809
After ten years, amortized cost | 37,967 | 40,658
Total amortized cost | 187,847 | 191,269
Total held to maturity investment securities, amortized cost | 206,327 | 210,112
Fair value within one year | 29,552 | 20,448
Fair value for one to five years | 51,759 | 41,705
Fair value for five to ten years | 102,334 | 107,107
Fair value for after ten years | 98,189 | 67,349
Total fair value | 281,834 | 236,609
Investment securities, available for sale | 687,142 | 600,348
Within one year, fair value | 150 | 70
One to five years, fair value | 51,152 | 49,324
five to ten years, fair value | 101,178 | 101,533
After ten years, fair value | 37,207 | 38,749
Total fair value | 189,687 | 189,676
Held-to-maturity, Fair Value | 210,106 | 208,273
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 212,829 | 187,563
Total held to maturity investment securities, amortized cost | 5,019 | 5,144
Investment securities, available for sale | 213,043 | 185,003
Held-to-maturity, Fair Value | 4,979 | 5,030
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 193,932 | 183,479
Total held to maturity investment securities, amortized cost | 13,461 | 13,699
Investment securities, available for sale | 192,265 | 178,736
Held-to-maturity, Fair Value | $ 13,557 | $ 13,567

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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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