Financial Information of Registrant (Parent Company) (Detail 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Operations
Interest income									$ 4,649	$ 5,024	$ 5,123
Equity in (loss) income of subsidiaries, net of tax									427	396	85
(Loss) income before income taxes	$ (5,822)	$ (327)	$ (30,607)	$ (8,374)	$ 458	$ (4,524)	$ 690	$ 804	(45,130)	(2,572)	9,723
Benefit for income taxes									(15,848)	(642)	(18,345)
Net (loss) income	$ (3,545)	$ (333)	$ (19,899)	$ (5,505)	$ 287	$ (3,018)	$ 315	$ 486	(29,282)	(1,930)	28,068
Parent Company
Statement of Operations
Interest income									2,283	1,328	61
Equity in (loss) income of subsidiaries, net of tax									(27,428)	(441)	23,804
Expenses									(4,508)	(4,238)	(2,887)
(Loss) income before income taxes									(29,653)	(3,351)	20,978
Benefit for income taxes									(371)	(1,421)	(7,090)
Net (loss) income									$ (29,282)	$ (1,930)	$ 28,068