Consolidated Statements of Comprehensive Income (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Consolidated Statements of Comprehensive Income (unaudited) [Abstract]
Net earnings	$ 6,858	$ 3,428
Unrealized gains on securities available-for-sale:
Unrealized holding gains arising during the year	2,946	(1,115)
Less: reclassification adjustment for gains on sales of securities available-for-sale	0	(204)
Total other comprehensive income (loss), before tax	2,946	(1,319)
Income tax effect related to items of other comprehensive income (loss)	(1,031)	461
Total other comprehensive income (loss), net of tax	1,915	(858)
Total comprehensive income	$ 8,773	$ 2,570