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Securities - Available for Sale Securities, Continuous Unrealized Loss Position, Fair value (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) Security | Dec. 31, 2017 USD ($) Security
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 8,532 | $ 2,691
Available-for-Sale Within One Year, Estimated Fair Value | $ 399,643 | $ 276,372
Available-for-Sale Within One Year, Number of Securities | Security | 142 | 93
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 3,224 | $ 2,593
Available-for-Sale More than One Year, Estimated Fair Value | $ 114,722 | $ 138,033
Available-for-Sale More than One Year, Number of Securities | Security | 68 | 67
Available-for-Sale, Gross Unrealized Loss | $ 11,756 | $ 5,284
Available-for-Sale, Estimated Fair Value | $ 514,365 | $ 414,405
Available-for-Sale, Number of Securities | Security | 210 | 160
Mortgage-backed securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 5,777 | $ 1,855
Available-for-Sale Within One Year, Estimated Fair Value | $ 243,061 | $ 197,621
Available-for-Sale Within One Year, Number of Securities | Security | 83 | 66
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 1,446 | $ 847
Available-for-Sale More than One Year, Estimated Fair Value | $ 54,871 | $ 56,998
Available-for-Sale More than One Year, Number of Securities | Security | 28 | 25
Available-for-Sale, Gross Unrealized Loss | $ 7,223 | $ 2,702
Available-for-Sale, Estimated Fair Value | $ 297,932 | $ 254,619
Available-for-Sale, Number of Securities | Security | 111 | 91
Collateralized mortgage obligations [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 1,388 | $ 773
Available-for-Sale Within One Year, Estimated Fair Value | $ 65,798 | $ 65,726
Available-for-Sale Within One Year, Number of Securities | Security | 18 | 20
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 1,557 | $ 1,125
Available-for-Sale More than One Year, Estimated Fair Value | $ 51,314 | $ 49,986
Available-for-Sale More than One Year, Number of Securities | Security | 36 | 32
Available-for-Sale, Gross Unrealized Loss | $ 2,945 | $ 1,898
Available-for-Sale, Estimated Fair Value | $ 117,112 | $ 115,712
Available-for-Sale, Number of Securities | Security | 54 | 52
U.S. government agency securities [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Available-for-Sale Within One Year, Gross Unrealized Loss | $ 36 | $ 15
Available-for-Sale Within One Year, Estimated Fair Value | $ 1,464 | $ 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 | $ 131 | $ 85
Available-for-Sale, Estimated Fair Value | $ 7,369 | $ 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 | $ 1,331 | $ 48
Available-for-Sale Within One Year, Estimated Fair Value | $ 89,320 | $ 11,541
Available-for-Sale Within One Year, Number of Securities | Security | 40 | 6
Available-for-Sale More than One Year, Gross Unrealized Loss | $ 126 | $ 21
Available-for-Sale More than One Year, Estimated Fair Value | $ 2,632 | $ 2,737
Available-for-Sale More than One Year, Number of Securities | Security | 2 | 2
Available-for-Sale, Gross Unrealized Loss | $ 1,457 | $ 69
Available-for-Sale, Estimated Fair Value | $ 91,952 | $ 14,278
Available-for-Sale, Number of Securities | Security | 42 | 8
Municipal bonds-taxable [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 |  | $ 0
Available-for-Sale More than One Year, Estimated Fair Value |  | $ 0
Available-for-Sale More than One Year, Number of Securities | Security |  | 0
Available-for-Sale, Gross Unrealized Loss |  | $ 0
Available-for-Sale, Estimated Fair Value |  | $ 0
Available-for-Sale, Number of Securities | Security |  | 0
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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