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Time Deposits - Summary of Large time Deposits and time Deposits Meet or Exceed Current FDIC Insurance Limit for Periods Presented (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Investments Schedule [Abstract] |  |
Time deposits of $100,000 or more | $ 319,811 | $ 328,363
Time deposits of $250,000 or more | $ 122,391 | $ 122,211

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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations of $100,000 or more. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 3 -Section V -Paragraph D-E + Details
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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818 + Details
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