Disclosures About Fair Value of Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value	$ 497,704	$ 431,045
Recurring basis [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value	497,704	431,045
Available-for-sale securities
Recurring basis [Member] \| Hedged loans [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Available-for-sale securities	74,947	54,362
Recurring basis [Member] \| Forward sale commitments [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Available-for-sale securities	942	662
Recurring basis [Member] \| Interest rate swap agreements [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Available-for-sale securities	(7,969)	(7,102)
Recurring basis [Member] \| Commitment to originate loan [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Available-for-sale securities
Recurring basis [Member] \| U.S. Treasury and federal agencies [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value	47,376	13,022
Recurring basis [Member] \| State and municipal [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value	174,821	143,890
Recurring basis [Member] \| Federal agency collateralized mortgage obligations [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value	99,041	91,122
Recurring basis [Member] \| Federal agency mortgage-backed pools [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value	174,137	179,351
Recurring basis [Member] \| Private labeled mortgage-backed pools [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value	2,288	3,636
Recurring basis [Member] \| Corporate notes [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value	41	24
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Hedged loans [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Available-for-sale securities
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Forward sale commitments [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Available-for-sale securities
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Interest rate swap agreements [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Available-for-sale securities
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Commitment to originate loan [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Available-for-sale securities
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| U.S. Treasury and federal agencies [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| State and municipal [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Federal agency collateralized mortgage obligations [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Federal agency mortgage-backed pools [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Private labeled mortgage-backed pools [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value
Recurring basis [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Corporate notes [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value	497,704	431,045
Available-for-sale securities
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Hedged loans [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Available-for-sale securities	74,947
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Forward sale commitments [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Available-for-sale securities	942
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Interest rate swap agreements [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Available-for-sale securities	(7,969)
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Commitment to originate loan [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Available-for-sale securities
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| U.S. Treasury and federal agencies [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value	47,376	13,022
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| State and municipal [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value	174,821	143,890
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Federal agency collateralized mortgage obligations [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value	99,041	91,122
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Federal agency mortgage-backed pools [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value	174,137	179,351
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Private labeled mortgage-backed pools [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value	2,288	3,636
Recurring basis [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Corporate notes [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value	41	24
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Hedged loans [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Available-for-sale securities		54,362
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Forward sale commitments [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Available-for-sale securities		662
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Interest rate swap agreements [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Available-for-sale securities		(7,101)
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Commitment to originate loan [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Available-for-sale securities
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| U.S. Treasury and federal agencies [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| State and municipal [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Federal agency collateralized mortgage obligations [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Federal agency mortgage-backed pools [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Private labeled mortgage-backed pools [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value
Recurring basis [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Corporate notes [Member]
Fair value measurements of assets and liabilities recognized on a recurring basis
Total available for sale securities, Fair Value

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.

+ References+ Details

- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References+ Details