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Securities - Carrying Value of Held-to-Maturity Investment Securities (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |  |
Amortized cost | $ 823,717 | $ 851,903
Net loss on date of transfer from available-for-sale | (13,347) | (13,347)
Accretion of net unrealized loss on securities reclassified as held-to-maturity | 8,883 | 8,254
Carrying value | $ 819,253 | $ 846,810

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- Definition Unrealized holding gain (loss) related to transfers of securities into held-to-maturity classification and out of the available-for-sale classification. + References No definition available. + Details
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- Definition Other comprehensive income reclassification of accretion of net unrealized losses to held to maturity securities. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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- Definition Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity). + References No definition available. + Details
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- References No definition available. + Details
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