Annual report pursuant to Section 13 and 15(d)

Accumulated Other Comprehensive Income (Loss) - Activity in Accumulated Other Comprehensive Income (Detail)

v3.6.0.2
Accumulated Other Comprehensive Income (Loss) - Activity in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period $ (315) $ 463 $ (9,380)
Other comprehensive loss before reclassification (2,033) 5,833 11,854
Reclassification from accumulated other comprehensive loss (46) (6,611) (2,011)
Other comprehensive (loss) income (2,079) (778) 9,843
Balance at end of period (2,394) (315) 463
Accumulated Net Unrealized Investment Gain (Loss) [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (2,331) (985) (18,187)
Other comprehensive loss before reclassification (1,712) 5,265 19,213
Reclassification from accumulated other comprehensive loss (46) (6,611) (2,011)
Other comprehensive (loss) income (1,758) (1,346) 17,202
Balance at end of period (4,089) (2,331) (985)
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 9 16 16
Other comprehensive loss before reclassification (9) (7) 0
Reclassification from accumulated other comprehensive loss 0 0
Other comprehensive (loss) income (9) (7) 0
Balance at end of period 0 9 16
Tax (Expense) Benefit [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period 2,007 1,432 8,791
Other comprehensive loss before reclassification (312) 575 (7,359)
Reclassification from accumulated other comprehensive loss 0 0 0
Other comprehensive (loss) income (312) 575 (7,359)
Balance at end of period $ 1,695 $ 2,007 $ 1,432