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Securities - Available for Sale Securities, Continuous Unrealized Loss Position, Fair value (Detail) $ in Thousands | Jun. 30, 2018 USD ($) Security | Dec. 31, 2017 USD ($) Security
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 9,027 | $ 2,691
Available-for-Sale Within One Year, Estimated Fair Value | $ 412,019 | $ 276,372
Available-for-Sale Within One Year, Number of Securities | Security | 144 | 93
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 4,147 | $ 2,593
Available-for-Sale More than One Year, Estimated Fair Value | $ 126,945 | $ 138,033
Available-for-Sale More than One Year, Number of Securities | Security | 72 | 67
Available-for-Sale, Gross Unrealized Loss | $ 13,174 | $ 5,284
Available-for-Sale, Estimated Fair Value | $ 538,964 | $ 414,405
Available-for-Sale, Number of Securities | Security | 216 | 160
Mortgage-backed securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 6,475 | $ 1,855
Available-for-Sale Within One Year, Estimated Fair Value | $ 266,671 | $ 197,621
Available-for-Sale Within One Year, Number of Securities | Security | 90 | 66
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 1,801 | $ 847
Available-for-Sale More than One Year, Estimated Fair Value | $ 55,820 | $ 56,998
Available-for-Sale More than One Year, Number of Securities | Security | 29 | 25
Available-for-Sale, Gross Unrealized Loss | $ 8,276 | $ 2,702
Available-for-Sale, Estimated Fair Value | $ 322,491 | $ 254,619
Available-for-Sale, Number of Securities | Security | 119 | 91
Collateralized mortgage obligations [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 1,259 | $ 773
Available-for-Sale Within One Year, Estimated Fair Value | $ 56,947 | $ 65,726
Available-for-Sale Within One Year, Number of Securities | Security | 14 | 20
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 2,120 | $ 1,125
Available-for-Sale More than One Year, Estimated Fair Value | $ 62,593 | $ 49,986
Available-for-Sale More than One Year, Number of Securities | Security | 39 | 32
Available-for-Sale, Gross Unrealized Loss | $ 3,379 | $ 1,898
Available-for-Sale, Estimated Fair Value | $ 119,540 | $ 115,712
Available-for-Sale, Number of Securities | Security | 53 | 52
U.S. government agency securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 44 | $ 15
Available-for-Sale Within One Year, Estimated Fair Value | $ 1,455 | $ 1,484
Available-for-Sale Within One Year, Number of Securities | Security | 1 | 1
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 95 | $ 70
Available-for-Sale More than One Year, Estimated Fair Value | $ 5,905 | $ 5,930
Available-for-Sale More than One Year, Number of Securities | Security | 2 | 2
Available-for-Sale, Gross Unrealized Loss | $ 139 | $ 85
Available-for-Sale, Estimated Fair Value | $ 7,360 | $ 7,414
Available-for-Sale, Number of Securities | Security | 3 | 3
Municipal bonds-tax exempt [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 1,249 | $ 48
Available-for-Sale Within One Year, Estimated Fair Value | $ 86,946 | $ 11,541
Available-for-Sale Within One Year, Number of Securities | Security | 39 | 6
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 131 | $ 21
Available-for-Sale More than One Year, Estimated Fair Value | $ 2,627 | $ 2,737
Available-for-Sale More than One Year, Number of Securities | Security | 2 | 2
Available-for-Sale, Gross Unrealized Loss | $ 1,380 | $ 69
Available-for-Sale, Estimated Fair Value | $ 89,573 | $ 14,278
Available-for-Sale, Number of Securities | Security | 41 | 8
Mutual funds [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss |  | $ 0
Available-for-Sale Within One Year, Estimated Fair Value |  | $ 0
Available-for-Sale Within One Year, Number of Securities | Security |  | 0
Available-for-Sale More than One Year, Gross Unrealized Loss |  | $ 530
Available-for-Sale More than One Year, Estimated Fair Value |  | $ 22,382
Available-for-Sale More than One Year, Number of Securities | Security |  | 6
Available-for-Sale, Gross Unrealized Loss |  | $ 530
Available-for-Sale, Estimated Fair Value |  | $ 22,382
Available-for-Sale, Number of Securities | Security |  | 6

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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