The aggregate amount at fair value for all domestic and foreign demand deposits liabilities held by the entity.

No definition available.

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This line item represents amount of specific reserve (after modification) modified by troubled debt restructurings.

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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-Name Accounting Standards Codification

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Amount of subordinated debt obligations (also known as subordinated loan, subordinated bond, subordinated debenture or junior debt) which has a priority ranking after other debts in a dissolution, measured at fair value.

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-Paragraph 2

-Subparagraph (a),(b)

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Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).

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Amount of gain (loss) recognized in other comprehensive income, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3).

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Issues that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Sales that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Transfers into assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.

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Transfers out of assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.

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This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

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-Name Accounting Standards Codification

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Amount of allowance for credit losses related to recorded investment.

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-Name Accounting Standards Codification

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-Paragraph 15

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-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 20

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Amount of receivables for which the allowance for credit losses had previously been measured under a general allowance for credit losses methodology, and are now identified as troubled debt restructurings.

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-SubTopic 40

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. The amount of securities that an institution sells and agrees to repurchase (seller-borrower) at a specified date for a specified price, net of any reductions or offsets. Most repurchase agreements involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit (CDs), are sometimes used in repurchase agreements. A repurchase agreement is similar to the seller-borrower's borrowing funds equal to the sales price of the related securities with the securities as collateral. Maturities of such agreements are flexible and generally vary from one day to 270 days.

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Fair Value Measurements (Details) (USD $)	9 Months Ended		12 Months Ended
Fair Value Measurements (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Changes in Company's Level 3 assets [Roll Forward]
Beginning balance	$ 630,000	$ 748,000	$ 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	15,000		(62,000)
Purchases, issuances, and settlements
Purchases	0		0
Issuances	0		0
Sales
Settlements	(37,000)		(54,000)
Ending balance	608,000		630,000
Specific reserves and other write downs on impaired loans	10,900,000		5,900,000
Troubled debt restructured loans	8,300,000
Troubled debt restructured loans, specific reserve	4,200,000
Impaired loans [Member]
Purchases, issuances, and settlements
Specific reserves and other write downs on impaired loans	10,900,000
Recurring [Member]
Carrying amount and estimated fair value of assets and liabilities [Abstract]
Investment securities available-for-sale	634,894,000		448,204,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	634,894,000		448,204,000
Nonrecurring [Member]
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Assets measured at fair value	32,225,000		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	8,828,000		9,285,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	8,828,000		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	111,545,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	111,545,000
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	163,375,000		150,666,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	163,375,000		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	197,158,000		193,685,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	197,158,000		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	102,477,000		52,061,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	102,477,000		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	48,436,000		39,532,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	48,436,000		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	3,075,000		2,975,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	3,075,000		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	29,160,000		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	3,065,000		7,405,000
Carrying amount [Member]
Carrying amount and estimated fair value of assets and liabilities [Abstract]
Cash and cash equivalents	544,658,000		749,174,000
Investment securities available-for-sale	634,894,000		448,204,000
Investment securities held-to-maturity	22,707,000		18,044,000
Federal Home Loan and Atlantic Central Bankers Bank stock	4,160,000		5,088,000
Commercial loans held for sale	7,970,000
Loans receivable, net	1,856,992,000		1,744,828,000
Demand and interest checking	2,300,025,000		2,192,938,000
Savings and money market	459,725,000		454,343,000
Time deposits	21,425,000		35,270,000
Subordinated debenture	13,401,000		13,401,000
Securities sold under agreements to repurchase	18,802,000		33,177,000
Accrued interest payable	100,000		123,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	634,894,000		448,204,000
Estimated fair value [Member]
Carrying amount and estimated fair value of assets and liabilities [Abstract]
Cash and cash equivalents	544,658,000		749,174,000
Investment securities available-for-sale	634,894,000		448,204,000
Investment securities held-to-maturity	18,634,000		13,826,000
Federal Home Loan and Atlantic Central Bankers Bank stock	4,160,000		5,088,000
Commercial loans held for sale	7,970,000
Loans receivable, net	1,855,671,000		1,718,698,000
Demand and interest checking	2,300,025,000		2,192,938,000
Savings and money market	459,725,000		454,343,000
Time deposits	21,491,000		35,336,000
Subordinated debenture	9,268,000		9,287,000
Securities sold under agreements to repurchase	18,802,000		33,177,000
Accrued interest payable	100,000		123,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	634,894,000		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	544,658,000
Investment securities available-for-sale	3,075,000
Investment securities held-to-maturity	0
Federal Home Loan and Atlantic Central Bankers Bank stock	4,160,000
Commercial loans held for sale	0
Loans receivable, net	0
Demand and interest checking	2,300,025,000
Savings and money market	459,725,000
Time deposits	0
Subordinated debenture	0
Securities sold under agreements to repurchase	18,802,000
Accrued interest payable	100,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	3,075,000
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	3,075,000		2,975,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	3,075,000		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	3,075,000		2,975,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	3,075,000		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	631,211,000
Investment securities held-to-maturity	0
Federal Home Loan and Atlantic Central Bankers Bank stock	0
Commercial loans held for sale	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	631,211,000
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	631,211,000		444,599,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	631,211,000		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	8,828,000		9,285,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	8,828,000		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	111,545,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	111,545,000
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	163,375,000		150,666,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	163,375,000		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	197,158,000		193,685,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	197,158,000		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	102,477,000		52,061,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	102,477,000		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	47,828,000		38,902,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	47,828,000		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	608,000
Investment securities held-to-maturity	18,634,000
Federal Home Loan and Atlantic Central Bankers Bank stock	0
Commercial loans held for sale	7,970,000
Loans receivable, net	1,855,671,000
Demand and interest checking	0
Savings and money market	0
Time deposits	21,491,000
Subordinated debenture	9,268,000
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	608,000
Significant unobservable inputs (Level 3) [Member] \| Recurring [Member]
Carrying amount and estimated fair value of assets and liabilities [Abstract]
Investment securities available-for-sale	608,000		630,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	608,000		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	32,225,000		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	608,000		630,000
Assets measured at fair value on a recurring and nonrecurring basis [Abstract]
Investment securities available-for-sale at fair value	608,000		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	29,160,000		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	$ 3,065,000		$ 7,405,000