Income Taxes Reconciliation of Expected Federal Tax Expense to Actual (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate									$ 2,113	$ 3,966	$ 6,436
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance									0	0	(2,462)
Release of Tax Valuation Allowance in Other Comprehensive Income									(188)	(570)	(1,858)
Tax on Intercompany Stock Sale									182	405	1,369
Income Tax Reconciliation, Tax Exempt Income									(364)	(251)	(203)
Tax on Change in Fair Value of Warrants									(158)	(398)	(81)
Income Tax Reconciliation, Prior Year Income Taxes									0	(280)	566
Tax Effect of Graduated Income Tax Rates									(100)	0	0
Income Tax Reconciliation, Other Reconciling Items									22	(24)	(82)
Federal income tax expense	$ (144)	$ 1,134	$ (64)	$ 581	$ (119)	$ 729	$ 1,369	$ 869	$ 1,507	$ 2,848	$ 3,685