Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 315,889	$ 149,459
Mortgage loans held for sale	12,125	7,306
Investment securities	1,497,131	1,587,694
Loans Held-for-sale, Fair Value Disclosure	12,125	7,306
Impaired Loan Fair Value	7,516	9,496
Other Assets, Fair Value Disclosure	5,030,111	4,997,318
Loans Receivable, Fair Value Disclosure	5,050,029	5,014,285
Noninterest Bearing Deposit Liabilities Fair Value	1,378,053	1,404,032
Interest bearing transactions accounts	1,227,177	1,107,200
Savings accounts	1,763,907	1,544,708
Time deposits	1,257,108	1,295,329
Other Liabilities, Fair Value Disclosure	4,066	1,290
Deposits, Fair Value Disclosure	5,630,311	5,352,559
Short Term Borrowings Fair Value	210,731	394,242
Long-term debt	781,862	771,420
Subordinated Debt Obligations, Fair Value Disclosure	40,857	41,596
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	315,889	149,459
Mortgage IRLCs	0	0
Investment securities	1,807	1,941
Noninterest Bearing Deposit Liabilities Fair Value	1,378,053	1,404,032
Interest bearing transactions accounts	1,227,177	1,107,200
Savings accounts	1,763,907	1,544,708
Other Liabilities, Fair Value Disclosure	4,066	1,290
Deposits, Fair Value Disclosure	4,373,203	4,057,230
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage IRLCs	277	165
Investment securities	1,494,503	1,584,984
Loans Held-for-sale, Fair Value Disclosure	12,125	7,306
Loans Receivable, Fair Value Disclosure	12,402	7,471
Time deposits	1,257,108	1,295,329
Deposits, Fair Value Disclosure	1,257,108	1,295,329
Short Term Borrowings Fair Value	210,731	394,242
Long-term debt	781,862	771,420
Subordinated Debt Obligations, Fair Value Disclosure	40,857	41,596
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage IRLCs	0	0
Investment securities	821	769
Impaired Loan Fair Value	7,516	9,496
Other Assets, Fair Value Disclosure	5,030,111	4,997,318
Loans Receivable, Fair Value Disclosure	5,037,627	5,006,814
Fair Value Swap [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	226	226
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, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage loans held for sale	12,125	7,306
Mortgage IRLCs	277	165
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	12,125	7,306
Mortgage IRLCs	277	165
Fair Value, Measurements, Recurring [Member] | Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	360,367	522,063
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	360,367	522,063
Fair Value, Measurements, Recurring [Member] | U.S. Government Sponsored Entities' Asset-Backed Securities [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	942,579	911,493
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	942,579	911,493
Fair Value, Measurements, Recurring [Member] | Other Equity Securities [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	2,628	2,710
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	1,807	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	821	769
Fair Value, Measurements, Recurring [Member] | 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 Swap [Member] | Fair Value, Inputs, Level 3 [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	3,481	4,436
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued interest receivable	3,481	4,436
Loans Receivable [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued interest receivable	14,016	14,239
Loans Receivable [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued interest receivable	14,016	14,239
Deposits [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued Liabilities, Fair Value Disclosure	1,023	987
Deposits [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued Liabilities, Fair Value Disclosure	72	66
Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued Liabilities, Fair Value Disclosure	951	921
Borrowings [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued Liabilities, Fair Value Disclosure	1,313	1,351
Borrowings [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued Liabilities, Fair Value Disclosure		4
Borrowings [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued Liabilities, Fair Value Disclosure	$ 1,313	$ 1,347