Fair Value of Financial Instruments (Assets Measured at Fair Value on a Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	$ 623,986	$ 628,571
U.S. Treasury and government agencies
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	30	32
U.S. government sponsored agencies
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	648	13,037
States and political subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	39,351	35,745
Residential mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	525,391	527,003
Commercial mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	42,410	37,289
Bank-issued trust preferred securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	12,744	12,211
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	3,412	3,254
Recurring Basis \| Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	623,986	628,571
Recurring Basis \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	14,581	3,126
Recurring Basis \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	609,405	625,445
Recurring Basis \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	0	0
Recurring Basis \| U.S. Treasury and government agencies \| Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	30	32
Recurring Basis \| U.S. Treasury and government agencies \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	0	0
Recurring Basis \| U.S. Treasury and government agencies \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	30	32
Recurring Basis \| U.S. Treasury and government agencies \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	0	0
Recurring Basis \| U.S. government sponsored agencies \| Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	648	13,037
Recurring Basis \| U.S. government sponsored agencies \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	0	0
Recurring Basis \| U.S. government sponsored agencies \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	648	13,037
Recurring Basis \| U.S. government sponsored agencies \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	0	0
Recurring Basis \| States and political subdivisions \| Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	39,351	35,745
Recurring Basis \| States and political subdivisions \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	0	0
Recurring Basis \| States and political subdivisions \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	39,351	35,745
Recurring Basis \| States and political subdivisions \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	0	0
Recurring Basis \| Residential mortgage-backed securities \| Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	525,391	527,003
Recurring Basis \| Residential mortgage-backed securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	11,340	0
Recurring Basis \| Residential mortgage-backed securities \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	514,051	527,003
Recurring Basis \| Residential mortgage-backed securities \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	0	0
Recurring Basis \| Commercial mortgage-backed securities \| Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	42,410	37,289
Recurring Basis \| Commercial mortgage-backed securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	0	0
Recurring Basis \| Commercial mortgage-backed securities \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	42,410	37,289
Recurring Basis \| Commercial mortgage-backed securities \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	0	0
Recurring Basis \| Bank-issued trust preferred securities \| Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	12,744	12,211
Recurring Basis \| Bank-issued trust preferred securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	0	0
Recurring Basis \| Bank-issued trust preferred securities \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	12,744	12,211
Recurring Basis \| Bank-issued trust preferred securities \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	0	0
Recurring Basis \| Equity securities \| Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	3,412	3,254
Recurring Basis \| Equity securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	3,241	3,126
Recurring Basis \| Equity securities \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	171	128
Recurring Basis \| Equity securities \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	$ 0	$ 0

Fair Value of Financial Instruments (Assets Measured at Fair Value on a Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified

Jun. 30, 2012

Dec. 31, 2011

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

$ 623,986

$ 628,571

U.S. Treasury and government agencies

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

U.S. government sponsored agencies

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

648

13,037

States and political subdivisions

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

39,351

35,745

Residential mortgage-backed securities

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

525,391

527,003

Commercial mortgage-backed securities

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

42,410

37,289

Bank-issued trust preferred securities

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

12,744

12,211

Equity securities

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

3,412

3,254

Recurring Basis | Fair Value

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

623,986

628,571

Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

14,581

3,126

Recurring Basis | Significant Other Observable Inputs (Level 2)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

609,405

625,445

Recurring Basis | Significant Unobservable Inputs (Level 3)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

Recurring Basis | U.S. Treasury and government agencies | Fair Value

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

Recurring Basis | U.S. Treasury and government agencies | Quoted Prices in Active Markets for Identical Assets (Level 1)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

Recurring Basis | U.S. Treasury and government agencies | Significant Other Observable Inputs (Level 2)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

Recurring Basis | U.S. Treasury and government agencies | Significant Unobservable Inputs (Level 3)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

Recurring Basis | U.S. government sponsored agencies | Fair Value

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

648

13,037

Recurring Basis | U.S. government sponsored agencies | Quoted Prices in Active Markets for Identical Assets (Level 1)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

Recurring Basis | U.S. government sponsored agencies | Significant Other Observable Inputs (Level 2)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

648

13,037

Recurring Basis | U.S. government sponsored agencies | Significant Unobservable Inputs (Level 3)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

Recurring Basis | States and political subdivisions | Fair Value

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

39,351

35,745

Recurring Basis | States and political subdivisions | Quoted Prices in Active Markets for Identical Assets (Level 1)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

Recurring Basis | States and political subdivisions | Significant Other Observable Inputs (Level 2)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

39,351

35,745

Recurring Basis | States and political subdivisions | Significant Unobservable Inputs (Level 3)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

Recurring Basis | Residential mortgage-backed securities | Fair Value

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

525,391

527,003

Recurring Basis | Residential mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

11,340

Recurring Basis | Residential mortgage-backed securities | Significant Other Observable Inputs (Level 2)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

514,051

527,003

Recurring Basis | Residential mortgage-backed securities | Significant Unobservable Inputs (Level 3)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

Recurring Basis | Commercial mortgage-backed securities | Fair Value

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

42,410

37,289

Recurring Basis | Commercial mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

Recurring Basis | Commercial mortgage-backed securities | Significant Other Observable Inputs (Level 2)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

42,410

37,289

Recurring Basis | Commercial mortgage-backed securities | Significant Unobservable Inputs (Level 3)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

Recurring Basis | Bank-issued trust preferred securities | Fair Value

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

12,744

12,211

Recurring Basis | Bank-issued trust preferred securities | Quoted Prices in Active Markets for Identical Assets (Level 1)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

Recurring Basis | Bank-issued trust preferred securities | Significant Other Observable Inputs (Level 2)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

12,744

12,211

Recurring Basis | Bank-issued trust preferred securities | Significant Unobservable Inputs (Level 3)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

Recurring Basis | Equity securities | Fair Value

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

3,412

3,254

Recurring Basis | Equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

3,241

3,126

Recurring Basis | Equity securities | Significant Other Observable Inputs (Level 2)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

171

128

Recurring Basis | Equity securities | Significant Unobservable Inputs (Level 3)

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]

Available-for-sale securities, fair value

$ 0

- Definition

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