Fair Value of Financial Instruments (Assets Measured at Fair Value on a Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	$ 602,645	$ 639,185
U.S. Treasury and government agencies
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	25	26
U.S. government sponsored agencies
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	459	516
States and political subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	47,165	45,668
Residential mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	495,135	514,096
Commercial mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	48,072	64,416
Bank-issued trust preferred securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	7,879	10,357
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	3,910	4,106
Recurring Basis \| Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available-for-sale securities, fair value	602,645	639,185
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	16,488	4,652
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	586,157	634,533
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	25	26
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	25	26
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	459	516
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	459	516
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	47,165	45,668
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	681
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	47,165	44,987
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	495,135	514,096
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	12,713	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	482,422	514,096
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	48,072	64,416
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	48,072	64,416
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	7,879	10,357
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	7,879	10,357
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	3,910	4,106
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	3,775	3,971
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	135	135
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

Mar. 31, 2013

Dec. 31, 2012

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

Available-for-sale securities, fair value

$ 602,645

$ 639,185

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

459

516

States and political subdivisions

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

Available-for-sale securities, fair value

47,165

45,668

Residential mortgage-backed securities

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

Available-for-sale securities, fair value

495,135

514,096

Commercial mortgage-backed securities

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

Available-for-sale securities, fair value

48,072

64,416

Bank-issued trust preferred securities

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

Available-for-sale securities, fair value

7,879

10,357

Equity Securities

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

Available-for-sale securities, fair value

3,910

4,106

Recurring Basis | Fair Value

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

Available-for-sale securities, fair value

602,645

639,185

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

16,488

4,652

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

586,157

634,533

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

459

516

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

459

516

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

47,165

45,668

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

681

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

47,165

44,987

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

495,135

514,096

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

12,713

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

482,422

514,096

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

48,072

64,416

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

48,072

64,416

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

7,879

10,357

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

7,879

10,357

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

3,910

4,106

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

3,775

3,971

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

135

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