Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 239,998	$ 149,459
Mortgage loans held for sale	15,204	7,306
Investment securities	1,425,387	1,587,694
Loans Held-for-sale, Fair Value Disclosure	15,204	7,306
Impaired Loan Fair Value	7,876	9,496
Other Assets, Fair Value Disclosure	5,090,488	4,997,318
Loans Receivable, Fair Value Disclosure	5,113,869	5,014,285
Noninterest Bearing Deposit Liabilities Fair Value	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 Liabilities, Fair Value Disclosure	5,401	1,290
Deposits, Fair Value Disclosure	5,525,051	5,352,559
Short Term Borrowings Fair Value	218,214	394,242
Long-term debt	777,696	771,420
Subordinated Debt Obligations, Fair Value Disclosure	40,964	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	239,998	149,459
Mortgage IRLCs	0	0
Investment securities	2,028	1,941
Noninterest Bearing Deposit Liabilities Fair Value	1,429,024	1,404,032
Interest bearing transactions accounts	1,227,995	1,107,200
Savings accounts	1,716,951	1,544,708
Other Liabilities, Fair Value Disclosure	5,401	1,290
Deposits, Fair Value Disclosure	4,379,371	4,057,230
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage IRLCs	301	165
Investment securities	1,422,580	1,584,984
Loans Held-for-sale, Fair Value Disclosure	15,204	7,306
Loans Receivable, Fair Value Disclosure	15,505	7,471
Time deposits	1,145,680	1,295,329
Deposits, Fair Value Disclosure	1,145,680	1,295,329
Short Term Borrowings Fair Value	218,214	394,242
Long-term debt	777,696	771,420
Subordinated Debt Obligations, Fair Value Disclosure	40,964	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	779	769
Impaired Loan Fair Value	7,876	9,496
Other Assets, Fair Value Disclosure	5,090,488	4,997,318
Loans Receivable, Fair Value Disclosure	5,098,364	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	15,204	7,306
Mortgage IRLCs	301	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	15,204	7,306
Mortgage IRLCs	301	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	269,145	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	269,145	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	952,897	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	952,897	911,493
Fair Value, Measurements, Recurring [Member] | Other Equity Securities [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	2,807	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	2,028	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	779	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	3,376	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	3,376	4,436
Loans Receivable [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued interest receivable	14,575	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	14,575	14,239
Deposits [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued Liabilities, Fair Value Disclosure	977	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	75	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	902	921
Borrowings [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued Liabilities, Fair Value Disclosure	1,327	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	$ 1,327	$ 1,347