Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 3,839	$ 40,159
Other comprehensive income:
Net change in unrealized gain	28,972	5,413
Reclassification adjustment for net losses realized and included in earnings	1,091	605
Amortization of unrealized net gain on securities transferred to held to maturity	798	647
Other comprehensive income before income taxes	30,861	6,665
Income tax	11,332	2,360
Other comprehensive income net of income taxes	19,529	4,305
Comprehensive income	$ 23,368	$ 44,464