Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Accumulated Other Comprehensive Income - Activity in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period $ 463 $ (9,380) $ 5,418
Other comprehensive income (loss) before reclassification 5,833 11,854 (13,759)
Reclassification from accumulated other comprehensive income (6,611) (2,011) (1,039)
Other comprehensive (loss) income (778) 9,843 (14,798)
Balance at end of period (315) 463 (9,380)
Accumulated Net Unrealized Investment Gain (Loss) [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period (985) (18,187) 7,348
Other comprehensive income (loss) before reclassification 5,265 19,213 (24,496)
Reclassification from accumulated other comprehensive income (6,611) (2,011) (1,039)
Other comprehensive (loss) income (1,346) 17,202 (25,535)
Balance at end of period (2,331) (985) (18,187)
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 16 16 16
Other comprehensive income (loss) before reclassification $ (7) 0 0
Reclassification from accumulated other comprehensive income 0 0
Other comprehensive (loss) income $ (7) 0 0
Balance at end of period 9 16 16
Tax (Expense) Benefit [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at beginning of period 1,432 8,791 (1,946)
Other comprehensive income (loss) before reclassification 575 (7,359) 10,737
Reclassification from accumulated other comprehensive income 0 0 0
Other comprehensive (loss) income 575 (7,359) 10,737
Balance at end of period $ 2,007 $ 1,432 $ 8,791