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Investment Securities Held to Maturity - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($) security | Dec. 31, 2016 USD ($) security | Dec. 31, 2015 USD ($)
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held to maturity securities at carrying value | $ 409,700,000 | $ 384,800,000 |
Investment securities held to maturity | 477,652,000 | 488,183,000 |
Fair value | 485,039,000 | 489,287,000 |
Proceeds from the calls | $ 55,720,000 | $ 62,975,000 | $ 37,271,000
Number of securities in an unrealized loss position | security | 184 | 332 |
Held-to-maturity Securities [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Recognized gain on calls of securities held to maturity portfolio | $ 60,000 | $ 15,000 | 8,000
Recognized loss on calls of securities held to maturity portfolio | 3,000 | 1,000 | 0
Proceeds from the calls | 32,900,000 | 45,900,000 | $ 27,000,000
Mortgage-backed securities [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Investment securities held to maturity | 382,000 | 893,000 |
Fair value | $ 396,000 | $ 924,000 |

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- Definition Held To Maturity Securities At Carrying Value. + References No definition available. + Details
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- Definition Recognized Gain (Loss) on Calls of Securities, Held-to-Maturity Portfolio + References No definition available. + Details
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- Definition Recognized Loss On Calls Of Securities Held To Maturity Portfolio + References No definition available. + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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