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Fair Value Measurements (Carrying Amount And Estimated Fair Value Of Assets And Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Carrying amount and estimated fair value of assets and liabilities [Abstract]
Investment securities available-for-sale	$ 1,196,956	$ 1,248,614
Investment securities held-to-maturity	85,099	91,799
Securities purchased under agreements to resell	65,095	39,199
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	65,095	39,199
Demand and interest checking	3,113,212	3,816,524
Savings and money market	452,183	421,780
Securities sold under agreements to repurchase	180	274
Significant Other Observable Inputs (Level 2) [Member]
Carrying amount and estimated fair value of assets and liabilities [Abstract]
Investment securities available-for-sale	1,153,403	1,248,614
Investment securities held-to-maturity	78,756	85,760
Interest rate swaps, asset	722	3,207
Significant Unobservable Inputs (Level 3) [Member]
Carrying amount and estimated fair value of assets and liabilities [Abstract]
Investment securities available-for-sale	43,553
Investment securities held-to-maturity	6,343	6,039
Federal Home Loan Bank and Atlantic Central Bankers Bank stock	991	1,613
Commercial loans held for sale	380,272	663,140
Loans, net of deferred loan fees and costs	1,373,325	1,219,625
Investment in unconsolidated entity, senior note	103,950	118,389
Investment in unconsolidated entity, subordinated note	3,761	8,541
Assets held for sale	314,994	360,711
Subordinated debentures	9,873	9,290
Carrying Amount [Member]
Carrying amount and estimated fair value of assets and liabilities [Abstract]
Investment securities available-for-sale	1,196,956	1,248,614
Investment securities held-to-maturity	86,402	93,467
Securities purchased under agreements to resell	65,095	39,199
Federal Home Loan Bank and Atlantic Central Bankers Bank stock	991	1,613
Commercial loans held for sale	380,272	663,140
Loans, net of deferred loan fees and costs	1,374,060	1,222,911
Investment in unconsolidated entity, senior note	103,950	118,389
Investment in unconsolidated entity, subordinated note	3,761	8,541
Assets held for sale	314,994	360,711
Demand and interest checking	3,113,212	3,816,524
Savings and money market	452,183	421,780
Subordinated debentures	13,401	13,401
Securities sold under agreements to repurchase	180	274
Interest rate swaps, asset	722	3,207
Estimated Fair Value [Member]
Carrying amount and estimated fair value of assets and liabilities [Abstract]
Investment securities available-for-sale	1,196,956	1,248,614
Investment securities held-to-maturity	85,099	91,799
Securities purchased under agreements to resell	65,095	39,199
Federal Home Loan Bank and Atlantic Central Bankers Bank stock	991	1,613
Commercial loans held for sale	380,272	663,140
Loans, net of deferred loan fees and costs	1,373,325	1,219,625
Investment in unconsolidated entity, senior note	103,950	118,389
Investment in unconsolidated entity, subordinated note	3,761	8,541
Assets held for sale	314,994	360,711
Demand and interest checking	3,113,212	3,816,524
Savings and money market	452,183	421,780
Subordinated debentures	9,873	9,290
Securities sold under agreements to repurchase	180	274
Interest rate swaps, asset	$ 722	$ 3,207

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Fair value portion of assets classified as held for sale.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

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Fair value of investments in debt securities classified as held-to-maturity.

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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Amount, after the effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes purchases of participations in pools of securities that are subject to a resale agreement, assets not subject to a master netting arrangement and not elected to be offset.

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