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STOCKHOLDERS' EQUITY - Changes to Accumulate Other Comprehensive Income by Components (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Gain (loss) on securities available-for-sale |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Balance at beginning of period | $ (11,542) | $ 5,227 | $ (9,702) | $ 5,227 | $ (9,042)
Unrealized gain (loss) arising during the period | (10,796) |  | 10,923 | (30,478) | 13,149
Reclassification adjustment from other comprehensive income | (278) |  | (1,099) | (5,519) | (4,455)
Tax effect of current period changes | 3,246 |  | (13,231) | 10,904 | (12,761)
Total changes, net of taxes | (7,828) |  | 18,583 | (25,093) | 17,923
Reclassification of stranded tax effects to retained earnings | 0 |  | 0 | 496 | 0
Balance at end of period | (19,370) | $ (11,542) | 8,881 | (19,370) | 8,881
Unrealized gain arising from the reclassification of securities held-to-maturity to securities available-for-sale |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Unrealized gain (loss) arising during the period | $ 0 |  | $ 21,990 | $ 0 | $ 21,990

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- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 + Details
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