Parent Company Financial Statements (Condensed Statements of Income and Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
INCOME
Net Gains on Securities									$ 1,481	$ 2,429	$ 1,667
EXPENSE
Salaries and Employee Benefits									32,710	31,482	29,086
Professional Fees									2,294	2,577	2,247
Interest Expense									6,047	7,155	10,912
INCOME BEFORE INCOME TAXES AND EQUITY IN UNDISTRIBUTED INCOME OF SUBSIDIARIES									40,413	36,877	34,724
Income Tax Benefit									(12,069)	(11,464)	(10,669)
NET INCOME	7,644	7,708	6,687	6,305	6,589	6,483	6,532	5,809	28,344	25,413	24,055
Other Comprehensive Income:
COMPREHENSIVE INCOME									36,497	9,799	23,863
Parent Company
INCOME
Interest Income									27	31	50
Net Gains on Securities									0	343	0
Other Income									25	75	70
Total Income									20,052	15,949	17,620
EXPENSE
Salaries and Employee Benefits									462	824	458
Professional Fees									316	485	352
Occupancy and Equipment Expense									7	7	7
Interest Expense									580	1,246	2,221
Other Expenses									632	615	359
Total Expenses									1,997	3,177	3,397
INCOME BEFORE INCOME TAXES AND EQUITY IN UNDISTRIBUTED INCOME OF SUBSIDIARIES									18,055	12,772	14,223
Income Tax Benefit									791	1,235	1,338
INCOME BEFORE EQUITY IN UNDISTRIBUTED INCOME OF SUBSIDIARIES									18,846	14,007	15,561
Equity in Undistributed Income of Subsidiaries									9,498	11,406	8,494
NET INCOME									28,344	25,413	24,055
Other Comprehensive Income:
Changes in Unrealized Gain (Loss) on Securities, Available-for-Sale									8,189	(15,874)	(124)
Changes in Unrecognized Amounts in Pension, Net									0	231	(47)
Changes in Unrecognized Loss in Postretirement Benefit Obligation, Net									(36)	29	(21)
COMPREHENSIVE INCOME									36,497	9,799	23,863
Parent Company | Bank
INCOME
Dividends from Subsidiaries									20,000	14,000	17,500
Parent Company | Non Bank
INCOME
Dividends from Subsidiaries									$ 0	$ 1,500	$ 0