Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 317,903	$ 149,459
Mortgage loans held for sale	11,517	7,306
Investment securities	1,546,711	1,587,694
Loans Held-for-sale, Fair Value Disclosure	11,517	7,306
Impaired Loan Fair Value	9,200	9,496
Other Assets, Fair Value Disclosure	4,966,414	4,997,318
Loans Receivable, Fair Value Disclosure	4,987,311	5,014,285
Noninterest Bearing Deposit Liabilities Fair Value	1,360,605	1,404,032
Interest bearing transactions accounts	1,282,606	1,107,200
Savings accounts	1,699,746	1,544,708
Time deposits	1,267,335	1,295,329
Other Liabilities, Fair Value Disclosure	2,728	1,290
Deposits, Fair Value Disclosure	5,613,020	5,352,559
Short Term Borrowings Fair Value	219,643	394,242
Long-term debt	779,209	771,420
Subordinated Debt Obligations, Fair Value Disclosure	40,983	41,596
Fair Value Swap [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	226	226
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage loans held for sale	11,517	7,306
Mortgage IRLCs	180	165
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage loans held for sale	11,517	7,306
Mortgage IRLCs	180	165
Fair Value, Measurements, Recurring [Member] | Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	421,210	522,063
Fair Value, Measurements, Recurring [Member] | Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	421,210	522,063
Fair Value, Measurements, Recurring [Member] | U.S. Government Sponsored Entities' Asset-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	948,351	911,493
Fair Value, Measurements, Recurring [Member] | U.S. Government Sponsored Entities' Asset-Backed Securities [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	948,351	911,493
Fair Value, Measurements, Recurring [Member] | Other Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	1,809	1,941
Fair Value, Measurements, Recurring [Member] | Other Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	813	769
Fair Value, Measurements, Recurring [Member] | Other Equity Securities [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	2,622	2,710
Fair Value, Measurements, Recurring [Member] | Fair Value Swap [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	226	226
Fair Value, Measurements, Recurring [Member] | Fair Value Swap [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	226	226
Available-for-sale Securities [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued interest receivable	3,215	4,436
Loans Receivable [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued interest receivable	14,200	14,239
Deposits [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued Liabilities, Fair Value Disclosure	1,024	987
Borrowings [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued Liabilities, Fair Value Disclosure	$ 1,349	$ 1,351