Fair Value (Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and money market instruments	$ 382,255	$ 237,699
Investment securities	1,413,049	1,445,405
Federal Home Loan Bank Stock	50,086	50,086
Federal Reserve Bank Stock	8,225	8,225
Loans Held-for-sale, Fair Value Disclosure	11,403	5,264
Impaired loans carried at fair value	12,599	16,963
Other loans	4,916,210	4,757,461
Loans receivable, net	4,940,407	4,779,758
Noninterest bearing checking accounts	1,288,750	1,269,296
Interest bearing transactions accounts	1,212,244	1,122,079
Savings accounts	1,623,832	1,325,445
Time deposits	1,330,003	1,422,885
Other	5,325	1,269
Total deposits	5,460,154	5,140,974
Short-term borrowings	278,324	276,980
Long-term debt	778,621	827,500
Subordinated debentures/notes	42,847	42,995
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	4,324	4,048
Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest receivable	14,652	13,629
Deposits [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest payable	1,143	1,125
Borrowings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest payable	1,327	1,426
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and money market instruments	382,255	237,699
Investment securities	1,410,973	1,442,477
Federal Home Loan Bank Stock	50,086
Federal Reserve Bank Stock	8,225
Loans Held-for-sale, Fair Value Disclosure	11,403	5,264
Derivative Assets	195	70
Impaired loans carried at fair value	12,599	16,963
Other loans	4,917,232	4,753,033
Loans receivable, net	4,941,429	4,775,330
Noninterest bearing checking accounts	1,288,750	1,269,296
Interest bearing transactions accounts	1,212,244	1,122,079
Savings accounts	1,623,832	1,325,445
Time deposits	1,324,831	1,409,911
Other	5,325	1,269
Total deposits	5,454,982	5,128,000
Short-term borrowings	278,324	276,980
Long-term debt	736,580	786,602
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	4,324	4,048
Reported Value Measurement [Member] | Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest receivable	14,652	13,629
Reported Value Measurement [Member] | Deposits [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest payable	1,143	1,125
Reported Value Measurement [Member] | Borrowings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest payable	1,327	1,426
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and money market instruments	382,255	237,699
Investment securities	1,876	1,922
Derivative Assets	0	0
Noninterest bearing checking accounts	1,288,750	1,269,296
Interest bearing transactions accounts	1,212,244	1,122,079
Savings accounts	1,623,832	1,325,445
Other	5,325	1,269
Total deposits	4,130,151	3,718,089
Fair Value, Inputs, Level 1 [Member] | Deposits [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest payable	63	14
Fair Value, Inputs, Level 1 [Member] | Borrowings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest payable	12	3
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	195	70
Impaired loans carried at fair value		16,963
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	1,410,416	1,442,708
Loans Held-for-sale, Fair Value Disclosure	11,403	5,264
Derivative Assets	195	70
Loans receivable, net	11,598	5,334
Time deposits	1,330,003	1,422,885
Total deposits	1,330,003	1,422,885
Short-term borrowings	278,324	276,980
Long-term debt	778,621	827,500
Subordinated debentures/notes	42,847	42,995
Level 2 [Member] | Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest receivable	4,324	4,048
Level 2 [Member] | Deposits [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest payable	1,080	1,111
Level 2 [Member] | Borrowings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest payable	1,315	1,423
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	757	775
Derivative Assets	0	0
Impaired loans carried at fair value	12,599	16,963
Other loans	4,916,210	4,757,461
Loans receivable, net	4,928,809	4,774,424
Fair Value, Inputs, Level 3 [Member] | Fair Value Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Swap	226	226
Fair Value, Inputs, Level 3 [Member] | Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Accrued interest receivable	$ 14,652	$ 13,629