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Fair Value Measurements (Details) (USD $)
6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Changes in Company's Level 3 assets [Roll Forward]    
Beginning balance $ 630,000 $ 748,000
Transfers into level 3 0 0
Transfers out of level 3 0 0
Total gains or losses (realized/unrealized) Included in earnings 0 (2,000)
Included in other comprehensive income 10,000 (62,000)
Purchases, issuances, and settlements    
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements (25,000) (54,000)
Ending balance 615,000 630,000
Specific reserves and other write downs on impaired loans 7,000,000 5,900,000
Troubled debt restructured loans 10,000,000  
Troubled debt restructured loans, specific reserve 3,300,000  
Impaired loans [Member]
   
Purchases, issuances, and settlements    
Specific reserves and other write downs on impaired loans 7,000,000  
Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 582,219,000 448,204,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 582,219,000 448,204,000
Nonrecurring [Member]
   
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Assets measured at fair value 32,441,000 24,992,000
U.S. Government agency securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 9,046,000 9,285,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 9,046,000 9,285,000
Federally insured student loan securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 50,276,000  
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 50,276,000  
Obligations of states and political subdivisions [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 159,972,000 150,666,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 159,972,000 150,666,000
Residential mortgage-backed securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 198,418,000 193,685,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 198,418,000 193,685,000
Commercial mortgage-backed securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 110,312,000 52,061,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 110,312,000 52,061,000
Other debt securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 51,185,000 39,532,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 51,185,000 39,532,000
Other equity securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 3,010,000 2,975,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 3,010,000 2,975,000
Impaired loans [Member] | Nonrecurring [Member]
   
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Assets measured at fair value 27,522,000 17,587,000
Other real estate owned [Member] | Nonrecurring [Member]
   
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Assets measured at fair value 4,919,000 7,405,000
Carrying amount [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Cash and cash equivalents 698,142,000 749,174,000
Investment securities available-for-sale 582,219,000 448,204,000
Investment securities held-to-maturity 17,796,000 18,044,000
Federal Home Loan and Atlantic Central Bankers Bank stock 4,596,000 5,088,000
Loans receivable, net 1,804,312,000 1,744,828,000
Demand and interest checking 2,335,960,000 2,192,938,000
Savings and money market 456,614,000 454,343,000
Time deposits 29,723,000 35,270,000
Subordinated debenture 13,401,000 13,401,000
Securities sold under agreements to repurchase 21,948,000 33,177,000
Accrued interest payable 127,000 123,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 582,219,000 448,204,000
Estimated fair value [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Cash and cash equivalents 698,142,000 749,174,000
Investment securities available-for-sale 582,219,000 448,204,000
Investment securities held-to-maturity 13,575,000 13,826,000
Federal Home Loan and Atlantic Central Bankers Bank stock 4,596,000 5,088,000
Loans receivable, net 1,782,607,000 1,718,698,000
Demand and interest checking 2,335,960,000 2,192,938,000
Savings and money market 456,614,000 454,343,000
Time deposits 29,859,000 35,336,000
Subordinated debenture 9,282,000 9,287,000
Securities sold under agreements to repurchase 21,948,000 33,177,000
Accrued interest payable 127,000 123,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 582,219,000 448,204,000
Quoted prices in active markets for identical assets (Level 1) [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Cash and cash equivalents 698,142,000  
Investment securities available-for-sale 3,010,000  
Investment securities held-to-maturity 0  
Federal Home Loan and Atlantic Central Bankers Bank stock 4,596,000  
Loans receivable, net 0  
Demand and interest checking 2,335,960,000  
Savings and money market 456,614,000  
Time deposits 0  
Subordinated debenture 0  
Securities sold under agreements to repurchase 21,948,000  
Accrued interest payable 127,000  
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 3,010,000  
Quoted prices in active markets for identical assets (Level 1) [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 3,010,000 2,975,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 3,010,000 2,975,000
Quoted prices in active markets for identical assets (Level 1) [Member] | Nonrecurring [Member]
   
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Assets measured at fair value 0 0
Quoted prices in active markets for identical assets (Level 1) [Member] | U.S. Government agency securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 0 0
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 0 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Federally insured student loan securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 0  
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 0  
Quoted prices in active markets for identical assets (Level 1) [Member] | Obligations of states and political subdivisions [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 0 0
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 0 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Residential mortgage-backed securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 0 0
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 0 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Commercial mortgage-backed securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 0 0
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 0 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Other debt securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 0 0
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 0 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Other equity securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 3,010,000 2,975,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 3,010,000 2,975,000
Quoted prices in active markets for identical assets (Level 1) [Member] | Impaired loans [Member] | Nonrecurring [Member]
   
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Assets measured at fair value 0 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Other real estate owned [Member] | Nonrecurring [Member]
   
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Assets measured at fair value 0 0
Significant other observable inputs (Level 2) [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Cash and cash equivalents 0  
Investment securities available-for-sale 578,594,000  
Investment securities held-to-maturity 0  
Federal Home Loan and Atlantic Central Bankers Bank stock 0  
Loans receivable, net 0  
Demand and interest checking 0  
Savings and money market 0  
Time deposits 0  
Subordinated debenture 0  
Securities sold under agreements to repurchase 0  
Accrued interest payable 0  
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 578,594,000  
Significant other observable inputs (Level 2) [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 578,594,000 444,599,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 578,594,000 444,599,000
Significant other observable inputs (Level 2) [Member] | Nonrecurring [Member]
   
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Assets measured at fair value 0 0
Significant other observable inputs (Level 2) [Member] | U.S. Government agency securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 9,046,000 9,285,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 9,046,000 9,285,000
Significant other observable inputs (Level 2) [Member] | Federally insured student loan securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 50,276,000  
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 50,276,000  
Significant other observable inputs (Level 2) [Member] | Obligations of states and political subdivisions [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 159,972,000 150,666,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 159,972,000 150,666,000
Significant other observable inputs (Level 2) [Member] | Residential mortgage-backed securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 198,418,000 193,685,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 198,418,000 193,685,000
Significant other observable inputs (Level 2) [Member] | Commercial mortgage-backed securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 110,312,000 52,061,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 110,312,000 52,061,000
Significant other observable inputs (Level 2) [Member] | Other debt securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 50,570,000 38,902,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 50,570,000 38,902,000
Significant other observable inputs (Level 2) [Member] | Other equity securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 0 0
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 0 0
Significant other observable inputs (Level 2) [Member] | Impaired loans [Member] | Nonrecurring [Member]
   
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Assets measured at fair value 0 0
Significant other observable inputs (Level 2) [Member] | Other real estate owned [Member] | Nonrecurring [Member]
   
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Assets measured at fair value 0 0
Significant unobservable inputs (Level 3) [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Cash and cash equivalents 0  
Investment securities available-for-sale 615,000  
Investment securities held-to-maturity 13,575,000  
Federal Home Loan and Atlantic Central Bankers Bank stock 0  
Loans receivable, net 1,782,607,000  
Demand and interest checking 0  
Savings and money market 0  
Time deposits 29,859,000  
Subordinated debenture 9,282,000  
Securities sold under agreements to repurchase 0  
Accrued interest payable 0  
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 615,000  
Significant unobservable inputs (Level 3) [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 615,000 630,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 615,000 630,000
Significant unobservable inputs (Level 3) [Member] | Nonrecurring [Member]
   
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Assets measured at fair value 32,441,000 24,992,000
Significant unobservable inputs (Level 3) [Member] | U.S. Government agency securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 0 0
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 0 0
Significant unobservable inputs (Level 3) [Member] | Obligations of states and political subdivisions [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 0 0
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 0 0
Significant unobservable inputs (Level 3) [Member] | Residential mortgage-backed securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 0 0
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 0 0
Significant unobservable inputs (Level 3) [Member] | Commercial mortgage-backed securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 0 0
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 0 0
Significant unobservable inputs (Level 3) [Member] | Other debt securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 615,000 630,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 615,000 630,000
Significant unobservable inputs (Level 3) [Member] | Other equity securities [Member] | Recurring [Member]
   
Carrying amount and estimated fair value of assets and liabilities [Abstract]    
Investment securities available-for-sale 0 0
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Investment securities available-for-sale at fair value 0 0
Significant unobservable inputs (Level 3) [Member] | Impaired loans [Member] | Nonrecurring [Member]
   
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Assets measured at fair value 27,522,000 17,587,000
Significant unobservable inputs (Level 3) [Member] | Other real estate owned [Member] | Nonrecurring [Member]
   
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]    
Assets measured at fair value $ 4,919,000 $ 7,405,000