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Accumulated Other Comprehensive Income (Loss) - Activity in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period, before tax | $ (4,089) | $ (2,331) |
Balance at end of period, before tax | (3,188) | (4,089) | $ (2,331)
Beginning balance | 531,025 | 493,918 | 453,387
Other comprehensive loss before reclassification | 2,273 | (2,033) | 5,833
Reclassification from accumulated other comprehensive loss | (1,748) | (46) | (6,611)
Other comprehensive income (loss) | 525 | (2,079) | (778)
Ending balance | 562,477 | 531,025 | 493,918
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period, before tax | (4,089) | (2,331) | (985)
Other comprehensive loss before reclassification, before tax | 2,649 | (1,712) | 5,265
Reclassification from accumulated other comprehensive loss, before tax | (1,748) | (46) | (6,611)
Period change, before tax | 901 | (1,758) | (1,346)
Balance at end of period, before tax |  | (4,089) | (2,331)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Interest-Only Strip [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period, before tax | 0 | 9 | 16
Other comprehensive loss before reclassification, before tax | 0 | (9) | (7)
Reclassification from accumulated other comprehensive loss, before tax | 0 | 0 |
Period change, before tax | 0 | (9) | (7)
Balance at end of period, before tax | 0 | 0 | 9
Tax (Expense) Benefit [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period, tax | 1,695 | 2,007 | 1,432
Other comprehensive loss before reclassification, tax | (376) | (312) | 575
Reclassification from accumulated other comprehensive loss, tax | 0 | 0 | 0
Period change, tax | (376) | (312) | 575
Balance at end of period, tax | 1,319 | 1,695 | 2,007
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (2,394) | (315) | 463
Other comprehensive income (loss) | 525 | (2,079) | (778)
Ending balance | $ (1,869) | $ (2,394) | $ (315)

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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