PARENT COMPANY FINANCIALS ONLY (Details 1) (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
Expenses
Interest expense	$ 5,935	$ 5,717	$ 5,798	$ 5,943	$ 6,528	$ 7,261	$ 7,398	$ 7,485	$ 23,393		$ 28,672		$ 38,763
Income tax benefit	3,127	3,687	3,238	4,621	4,248	4,607	4,092	4,201	14,673		17,148		12,227
Net income	9,968	11,601	8,874	12,183	11,169	11,959	11,120	11,188	42,627		45,436		40,240
Parent Company [Member]
Income
Dividends received from subsidiaries(1)									28,709	[1]	20,962	[1]	18,857	[1]
Interest income(2)									83	[2]	74	[2]	85	[2]
Total income									28,792		21,036		18,942
Expenses
Interest expense									3,795		3,820		3,692
Other expenses									6		1		1
Total expenses									3,801		3,821		3,693
Income before income taxes and equity in undistributed income of subsidiaries									24,991		17,215		15,249
Income tax benefit									(1,636)		(1,409)		(1,184)
Income of parent company									26,627		18,624		16,433
Equity in undistributed income of subsidiaries									16,000		26,812		23,807
Net income									42,627		45,436		40,240
Consolidation, Eliminations [Member]
Income
Dividends received from subsidiaries(1)									$ 28,664		$ 20,924		$ 18,819

[1] Income of $28,664, $20,924 and $18,819 eliminated in consolidation for the years ended December 31, 2012, 2011, and 2010, respectively.

[2] Entire balance eliminated in consolidation.