Fair Value Measurements (Detail 2) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Total realized/unrealized gains (losses):
Transfers into/out of level 3, assets	$ 0	$ 0
Transfers into/out of level 3, liabilities	0	0
Securities Available-for-Sale
Level 3 Assets Measured on a Recurring Basis
Balance, beginning of period	3,547	3,633
Total realized/unrealized gains (losses):
Included in other comprehensive income	23	(9)
Settlements	(100)	(100)
Balance, end of period	3,470	3,524
Equity Warrants
Level 3 Assets Measured on a Recurring Basis
Balance, beginning of period	882
Total realized/unrealized gains (losses):
Included in earnings	65	78
Additions	1,288	631
Settlements		(29)
Balance, end of period	2,235	680
Contingent Consideration Asset
Level 3 Assets Measured on a Recurring Basis
Balance, beginning of period	2,930
Total realized/unrealized gains (losses):
Included in earnings	(325)
Additions		2,930
Balance, end of period	$ 2,605	$ 2,930