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Securities - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2014 USD ($) Security | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Unrealized loss, other than temporary securities |  | $ 0 |  |
Number of securities | Security | 319 |  |  |
Aggregate fair value of securities | $ 167,100,000 |  |  |
Gain/Loss from net unrealized holdings, Net of tax | 1,300,000 |  |  |
Unrealized gain or loss, Held to maturity | $ 0 |  |  |
Tax effect of the proceeds from sale of securities |  | 13,000 | $ 643,000 | $ 66,000
Pledged of Fair Value of Securities as collateral |  | 74,000,000 |  |
Amortization cost of securities as Collateral not Separately Reported |  | 75,600,000 |  |
Debt Instrument Repurchase Agreement |  | 61,100,000 |  |
Securities Pledged for Federal Home Loan Bank At Fair Value |  | 94,600,000 |  |
Securities for Federal Home Loan Bank Not Separately Reported |  | 93,100,000 |  |
Securities Pledged For Derivative At Fair Value |  | 13,100,000 |  |
Securities Pledged For Derivative At Amortized Cost |  | 13,100,000 |  |
Debt Instrument Derivative Swap Agreement |  | 917,000 |  |
Debt Instrument Federal Home Loan Bank |  | $ 11,000,000 |  |

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- Definition Total of accumulated other comprehensive loss related to that portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized either as available-for-sale or held-to-maturity that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 9A -URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284427-111562 + Details
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- Definition The fair value, as of the date of each statement of financial position presented, of securities which are owned but transferred to serve as collateral for the payment of the FHLB debt obligations, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details
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- Definition The fair value, as of the date of each statement of financial position presented, of securities which are owned but transferred to serve as collateral for the payment of repurchase agreements, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details
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- Definition The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for repurchase agreements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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