Consolidated Statement of Comprehensive Income - (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statement of Comprehensive Income [Abstract]
Net income	$ 6,636	$ 2,345	$ 16,252	$ 811
Other comprehensive income (loss):
Unrealized holding gains on securities arising during the period	1,597	646	2,226	6,573
Income tax effect	(559)	(220)	(779)	(2,235)
Unrealized holding gain on securities transferred from the held-to-maturity category into the available-for-sale category	0	0	8,509	0
Income tax effect	0	0	(2,978)	0
Reclassification adjustment for gains included in net income	0	(1,413)	(9,006)	(1,413)
Income tax effect	0	477	3,152	480
Other comprehensive income (loss), net of tax	1,038	(510)	1,124	3,405
Comprehensive income	$ 7,674	$ 1,835	$ 17,376	$ 4,216