Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Accumulated Other Comprehensive Income - Activity in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period $ 5,364 $ 6,199 $ (315) $ 463
Other comprehensive income (loss) 3,757 (3,864) 9,436 4,056
Reclassification from accumulated other comprehensive income   (1,912)   (4,096)
Other comprehensive income, net of tax 3,757 (5,776) 9,436 (40)
Balance at end of period 9,121 423 9,121 423
Accumulated Net Unrealized Investment Gain (Loss) [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period 7,392 8,874 (2,331) (985)
Other comprehensive income (loss) 6,424 (8,041) 16,147 4,002
Reclassification from accumulated other comprehensive income   (1,912)   (4,096)
Other comprehensive income, net of tax   (9,953)   (94)
Balance at end of period 13,816 (1,079) 13,816 (1,079)
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 9 16
Other comprehensive income (loss) (9) 0 (9) 0
Reclassification from accumulated other comprehensive income   0   0
Other comprehensive income, net of tax   0   0
Balance at end of period 0 16 0 16
Tax Benefit (Expense) [Member]        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at beginning of period (2,037) (2,691) 2,007 1,432
Other comprehensive income (loss) (2,658) 4,177 (6,702) 54
Reclassification from accumulated other comprehensive income   0   0
Other comprehensive income, net of tax   4,177   54
Balance at end of period $ (4,695) $ 1,486 $ (4,695) $ 1,486