Loans Receivable (Schedule Of Loans Receivable) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Loans Receivable [Line Items]
Total loans receivable	$ 7,478,306	$ 7,388,037
Residential Mortgage Loans [Member]
Loans Receivable [Line Items]
Total loans receivable	472,476	499,387
Residential Mortgage Loans [Member] | Residential 1-4 Family [Member]
Loans Receivable [Line Items]
Total loans receivable	457,248	483,244
Residential Mortgage Loans [Member] | Construction/ Owner Occupied [Member]
Loans Receivable [Line Items]
Total loans receivable	15,228	16,143
Commercial Loans [Member]
Loans Receivable [Line Items]
Total loans receivable	5,424,543	5,364,356
Commercial Loans [Member] | Real Estate [Member]
Loans Receivable [Line Items]
Total loans receivable	3,263,960	3,318,982
Commercial Loans [Member] | Business [Member]
Loans Receivable [Line Items]
Total loans receivable	2,160,583	2,045,374
Consumer Loans [Member]
Loans Receivable [Line Items]
Total loans receivable	1,581,287	1,524,294
Consumer Loans [Member] | Indirect Automobile [Member]
Loans Receivable [Line Items]
Total loans receivable	288,064	261,896
Consumer Loans [Member] | Home Equity [Member]
Loans Receivable [Line Items]
Total loans receivable	1,092,989	1,061,437
Consumer Loans [Member] | Consumer - Other [Member]
Loans Receivable [Line Items]
Total loans receivable	$ 200,234	$ 200,961