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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 26,850 | $ 20,532
Amortized cost one to five years | 40,560 | 42,476
Amortized cost for five to ten years | 88,574 | 107,839
Amortized cost for after ten years | 124,740 | 67,020
Total amortized cost | 280,724 | 237,867
Total available for sale investment securities, Amortized Cost | 663,268 | 608,909
Within one year, amortized cost | 2,481 | 70
One to five years, amortized cost | 56,121 | 48,732
Five to ten years, amortized cost | 101,195 | 101,809
After ten years, amortized cost | 35,922 | 40,658
Total amortized cost | 195,719 | 191,269
Total held to maturity investment securities, amortized cost | 213,768 | 210,112
Fair value within one year | 26,836 | 20,448
Fair value for one to five years | 40,333 | 41,705
Fair value for five to ten years | 92,128 | 107,107
Fair value for after ten years | 129,077 | 67,349
Total fair value | 288,374 | 236,609
Investment securities, available for sale | 673,419 | 600,348
Within one year, fair value | 2,499 | 70
One to five years, fair value | 57,124 | 49,324
five to ten years, fair value | 104,168 | 101,533
After ten years, fair value | 37,904 | 38,749
Total fair value | 201,695 | 189,676
Held-to-maturity, Fair Value | 219,891 | 208,273
Federal Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 229,166 | 187,563
Total held to maturity investment securities, amortized cost | 4,884 | 5,144
Investment securities, available for sale | 231,522 | 185,003
Held-to-maturity, Fair Value | 4,877 | 5,030
Federal Agency Mortgage-backed Pools [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total available for sale investment securities, Amortized Cost | 153,378 | 183,479
Total held to maturity investment securities, amortized cost | 13,165 | 13,699
Investment securities, available for sale | 153,523 | 178,736
Held-to-maturity, Fair Value | $ 13,319 | $ 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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