Comprehensive Income (Details) (USD $) In Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Components of Comprehensive Income
Net earnings	$ 11,886	$ 13,222	$ 22,171	$ 23,292	$ 42,330
Unrealized holding gain arising during the period	36,154	5,635	39,182	15,588
Tax expense	(14,169)	(2,209)	(15,355)	(6,109)
Net after tax	21,985	3,426	23,827	9,479
Reclassification adjustment for losses (gains) included in net earnings	591	(242)	467	(556)
Tax (benefit) expense	(231)	95	(183)	218
Net after tax	360	(147)	284	(338)
Net unrealized gain on securities	22,345	3,279	24,111	9,141
Total comprehensive income	$ 34,231	$ 16,501	$ 46,282	$ 32,433	$ 43,206

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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