Parent Company Financial Statements (Statements of Income) (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
Condensed Financial Statements, Captions [Line Items]
Interest on borrowings									$ 5,363	$ 8,948	$ 12,257
Salaries and employee benefits									29,689	28,627	26,337
Net occupancy									4,365	3,949	3,833
Furniture, equipment and data processing									5,079	4,773	4,647
Income before income taxes	6,082	9,247	9,306	9,675	8,375	9,983	10,327	9,273	34,310	37,958	35,879
Income tax benefit	(1,904)	(2,992)	(2,894)	(3,092)	(2,536)	(3,054)	(3,257)	(2,934)	(10,882)	(11,781)	(11,113)
Net Income	4,178	6,255	6,412	6,583	5,839	6,929	7,070	6,339	23,428	26,177	24,766
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Dividend income from subsidiaries									13,400	15,400	12,400
Fees from subsidiaries									20,070	18,048	16,821
Other income									170	13	188
Total operating income									33,640	33,461	29,409
Interest on borrowings									2,546	2,614	2,817
Salaries and employee benefits									13,007	11,417	10,316
Net occupancy									492	473	461
Furniture, equipment and data processing									3,971	3,296	3,158
Other operating expenses									2,790	3,041	3,186
Total operating expenses									22,806	20,841	19,938
Income before equity in undistributed earnings of subsidiaries and income taxes									10,834	12,620	9,471
Equity In Undistributed Earnings Of Subsidiaries									11,647	12,441	14,372
Income before income taxes									22,481	25,061	23,843
Income tax benefit									947	1,116	923
Net Income									$ 23,428	$ 26,177	$ 24,766