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Investment Securities Held to Maturity - Disclosure Regarding Length of Time on Investment Securities with Temporary Impairment (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Held-to-maturity Securities [Line Items] |  |
Less than 12 months, fair value | $ 50,800 | $ 180,374
12 months or longer, Fair value | 49,488 | 6,617
Total, fair value | 100,288 | 186,991
Less than 12 months, gross unrealized losses | (465) | (5,267)
12 months or longer, gross unrealized losses | (1,443) | (304)
Total, gross unrealized losses | (1,908) | (5,571)
Agency Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Less than 12 months, fair value | 3,821 | 3,525
12 months or longer, Fair value | 0 | 0
Total, fair value | 3,821 | 3,525
Less than 12 months, gross unrealized losses | (87) | (83)
12 months or longer, gross unrealized losses | 0 | 0
Total, gross unrealized losses | (87) | (83)
State and municipal obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Less than 12 months, fair value | 37,317 | 172,152
12 months or longer, Fair value | 49,488 | 6,617
Total, fair value | 86,805 | 178,769
Less than 12 months, gross unrealized losses | (295) | (5,132)
12 months or longer, gross unrealized losses | (1,443) | (304)
Total, gross unrealized losses | (1,738) | (5,436)
Corporate Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Less than 12 months, fair value | 9,662 | 4,697
12 months or longer, Fair value | 0 | 0
Total, fair value | 9,662 | 4,697
Less than 12 months, gross unrealized losses | (83) | (52)
12 months or longer, gross unrealized losses |  |
Total, gross unrealized losses | $ (83) | $ (52)

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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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