Fair Value (Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and money market instruments	$ 239,998	$ 149,459
Investment securities	1,425,387	1,587,694
Federal Home Loan Bank Stock	50,086	50,086
Federal Reserve Bank Stock	8,225	8,225
Loans Held-for-sale, Fair Value Disclosure	15,204	7,306
Impaired Loan Fair Value	7,876	9,496
Other loans	5,090,488	4,997,318
Loans receivable, net	5,113,869	5,014,285
Noninterest bearing checking accounts	1,429,024	1,404,032
Interest bearing transactions accounts	1,227,995	1,107,200
Savings accounts	1,716,951	1,544,708
Time deposits	1,145,680	1,295,329
Other	5,401	1,290
Total deposits	5,525,051	5,352,559
Short-term borrowings	218,214	394,242
Long-term debt	777,696	771,420
Subordinated debentures/notes	40,964	41,596
Fair Value Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Swap	226	226
Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest receivable	3,376	4,436
Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest receivable	14,575	14,239
Deposits [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest payable	977	987
Borrowings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest payable	1,327	1,351
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and money market instruments	239,998	149,459
Investment securities	1,419,944	1,585,568
Loans Held-for-sale, Fair Value Disclosure	15,204	7,306
Derivative Assets	301	165
Impaired Loan Fair Value	7,876	9,496
Other loans	5,110,061	4,994,624
Loans receivable, net	5,133,442	5,011,591
Noninterest bearing checking accounts	1,429,024	1,404,032
Interest bearing transactions accounts	1,227,995	1,107,200
Savings accounts	1,716,951	1,544,708
Time deposits	1,140,288	1,290,412
Other	5,401	1,290
Total deposits	5,519,659	5,347,642
Short-term borrowings	218,214	394,242
Long-term debt	742,723	738,105
Subordinated debentures/notes	45,000	45,000
Reported Value Measurement [Member] | Fair Value Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Swap	226	226
Reported Value Measurement [Member] | Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest receivable	3,376	4,436
Reported Value Measurement [Member] | Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest receivable	14,575	14,239
Reported Value Measurement [Member] | Deposits [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest payable	977	987
Reported Value Measurement [Member] | Borrowings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest payable	1,328	1,351
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	$ 301	165
Impaired Loan Fair Value		$ 9,496