Quarterly report pursuant to Section 13 or 15(d)

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

v3.4.0.3
Accumulated Other Comprehensive Income - Activity in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period $ (315) $ 463
Other comprehensive income (loss) before reclassification 5,679 7,920
Reclassification from accumulated other comprehensive income   (2,184)
Other comprehensive income, net of tax 5,679 5,736
Balance at end of period 5,364 6,199
Accumulated Net Unrealized Investment Gain (Loss) [Member]    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period (2,331) (985)
Other comprehensive income (loss) before reclassification 9,723 12,043
Reclassification from accumulated other comprehensive income   (2,184)
Other comprehensive income, net of tax   9,859
Balance at end of period 7,392 8,874
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Interest-Only Strip [Member]    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period 9 16
Other comprehensive income (loss) before reclassification 0 0
Reclassification from accumulated other comprehensive income   0
Other comprehensive income, net of tax   0
Balance at end of period 9 16
Tax Benefit (Expense) [Member]    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at beginning of period 2,007 1,432
Other comprehensive income (loss) before reclassification (4,044) (4,123)
Reclassification from accumulated other comprehensive income   0
Other comprehensive income, net of tax   (4,123)
Balance at end of period $ (2,037) $ (2,691)