Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 391,772	$ 146,466
Mortgage loans held for sale	6,722	10,413
Investment securities	1,502,552	1,514,811
Loans Held-for-sale, Fair Value Disclosure	6,722	10,413
Impaired Loan Fair Value	4,319	5,983
Other Assets, Fair Value Disclosure	5,185,883	5,161,919
Loans Receivable, Fair Value Disclosure	5,197,158	5,178,439
Noninterest Bearing Deposit Liabilities Fair Value	1,548,363	1,523,417
Interest bearing transactions accounts	1,310,575	1,174,448
Savings accounts	1,928,507	1,704,920
Time deposits	1,133,360	1,122,598
Other Liabilities, Fair Value Disclosure	2,706	1,301
Deposits, Fair Value Disclosure	5,923,511	5,526,684
Short Term Borrowings Fair Value	219,863	394,795
Long-term debt	760,798	712,958
Subordinated Debt Obligations, Fair Value Disclosure	43,786	40,903
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	391,772	146,466
Mortgage IRLCs	0	0
Investment securities	2,621	2,644
Noninterest Bearing Deposit Liabilities Fair Value	1,548,363	1,523,417
Interest bearing transactions accounts	1,310,575	1,174,448
Savings accounts	1,928,507	1,704,920
Other Liabilities, Fair Value Disclosure	2,706	1,301
Deposits, Fair Value Disclosure	4,790,151	4,404,086
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage IRLCs	234	124
Investment securities	1,499,155	1,511,377
Loans Held-for-sale, Fair Value Disclosure	6,722	10,413
Loans Receivable, Fair Value Disclosure	6,956	10,537
Time deposits	1,133,360	1,122,598
Deposits, Fair Value Disclosure	1,133,360	1,122,598
Short Term Borrowings Fair Value	219,863	394,795
Long-term debt	760,798	712,958
Subordinated Debt Obligations, Fair Value Disclosure	43,786	40,903
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage IRLCs	0	0
Investment securities	776	790
Impaired Loan Fair Value	4,319	5,983
Other Assets, Fair Value Disclosure	5,185,883	5,161,919
Loans Receivable, Fair Value Disclosure	5,190,202	5,167,902
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	6,722	10,413
Mortgage IRLCs	234	124
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	6,722	10,413
Mortgage IRLCs	234	124
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	268,421	267,533
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	268,421	267,533
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	947,579	987,172
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	947,579	987,172
Fair Value, Measurements, Recurring [Member] | Other Equity Securities [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	3,397	3,434
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	2,621	2,644
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	776	790
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	4,179	3,849
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	4,179	3,849
Loans Receivable [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued interest receivable	14,449	14,973
Loans Receivable [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued interest receivable	14,449	14,973
Deposits [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued Liabilities, Fair Value Disclosure	901	900
Deposits [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued Liabilities, Fair Value Disclosure	46	82
Deposits [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued Liabilities, Fair Value Disclosure	855	818
Borrowings [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued Liabilities, Fair Value Disclosure	1,288	1,251
Borrowings [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued Liabilities, Fair Value Disclosure		1
Borrowings [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Accrued Liabilities, Fair Value Disclosure	$ 1,288	$ 1,250