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Fair Value Measurements (Carrying Amount And Estimated Fair Value Of Assets And Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale $ 1,274,417 $ 1,294,484
Investment securities held-to-maturity 83,751 85,345
Securities purchased under agreements to resell 64,518 64,312
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]    
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Securities purchased under agreements to resell 64,518 64,312
Demand and interest checking 3,540,605 3,806,965
Savings and money market 317,453 453,877
Securities sold under agreements to repurchase 158 217
Significant Other Observable Inputs (Level 2) [Member]    
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 1,222,371 1,253,840
Investment securities held-to-maturity 76,363 78,745
Interest rate swaps, asset 2,830 1,243
Significant Unobservable Inputs (Level 3) [Member]    
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 52,046 40,644
Investment securities held-to-maturity 7,388 6,600
Federal Home Loan Bank and Atlantic Central Bankers Bank stock 1,113 991
Commercial loans held for sale 308,470 503,316
Loans, net of deferred loan fees and costs 1,494,821 1,391,701
Investment in unconsolidated entity 64,212 74,473
Assets held for sale from discontinued operations 226,026 304,313
Subordinated debentures 10,091 9,173
Carrying Amount [Member]    
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 1,274,417 1,294,484
Investment securities held-to-maturity 84,433 86,380
Securities purchased under agreements to resell 64,518 64,312
Federal Home Loan Bank and Atlantic Central Bankers Bank stock 1,113 991
Commercial loans held for sale 308,470 503,316
Loans, net of deferred loan fees and costs 1,496,773 1,392,228
Investment in unconsolidated entity 64,212 74,473
Assets held for sale from discontinued operations 226,026 304,313
Interest rate swaps, asset 2,830 1,243
Demand and interest checking 3,540,605 3,806,965
Savings and money market 317,453 453,877
Subordinated debentures 13,401 13,401
Securities sold under agreements to repurchase 158 217
Estimated Fair Value [Member]    
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 1,274,417 1,294,484
Investment securities held-to-maturity 83,751 85,345
Securities purchased under agreements to resell 64,518 64,312
Federal Home Loan Bank and Atlantic Central Bankers Bank stock 1,113 991
Commercial loans held for sale 308,470 503,316
Loans, net of deferred loan fees and costs 1,494,821 1,391,701
Investment in unconsolidated entity 64,212 74,473
Assets held for sale from discontinued operations 226,026 304,313
Interest rate swaps, asset 2,830 1,243
Demand and interest checking 3,540,605 3,806,965
Savings and money market 317,453 453,877
Subordinated debentures 10,091 9,173
Securities sold under agreements to repurchase $ 158 $ 217