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Securities - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2013
Investment [Line Items] |  |  |  |
Available-for-sale securities transferred to held-to-maturity securities | $ 536,000,000 |  |  | $ 536,000,000
Unrealized net loss on securities reclassified from available-for-sale to held-to-maturity, Gross | $ 13,300,000 |  |  | $ 13,300,000
Realized gains on sale of investment securities |  | $ 248,000 | $ 0 |
Corporate debt securities, callable, amortized cost |  | 55,800,000 |  |
Corporate debt securities, callable, estimated fair value |  | 51,100,000 |  |
Estimated fair value of securities pledged for deposits and other purposes |  | 563,100,000 | 466,400,000 |
Reverse Repurchase Agreements |  |  |  |
Investment [Line Items] |  |  |  |
Estimated fair value of securities pledged for reverse repurchase agreements |  | $ 74,100,000 | $ 58,000,000 |

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- Definition Available For Sale And Held To Maturity Securities Amount Callable Amortized Cost + References No definition available. + Details
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- Definition Other Comprehensive Income Reclassification Adjustment For Held To Maturity Transferred From Available For Sale Securities Before Tax + References No definition available. + Details
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- Definition Amount of realized gain on 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 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition The fair value, as of the date of each statement of financial position presented, of securities that are restricted as collateral for the payment of other 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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