Fair Value Measurements (Financial Assets Measured at Fair Value on Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	$ 619,410
Residential MBSs [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	69,039
Fair value measurements, recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	619,410	613,459
Fair value measurements, recurring [Member] \| U.S. Government agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale		22,558
Fair value measurements, recurring [Member] \| Residential MBSs [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	69,039	21,412
Fair value measurements, recurring [Member] \| Corporate debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	14,558	18,320
Fair value measurements, recurring [Member] \| Municipal securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	24,278
Fair value measurements, recurring [Member] \| Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	0	0
Fair value measurements, recurring [Member] \| Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] \| U.S. Government agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale		0
Fair value measurements, recurring [Member] \| Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] \| Residential MBSs [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	0	0
Fair value measurements, recurring [Member] \| Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] \| Corporate debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	0	0
Fair value measurements, recurring [Member] \| Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] \| Municipal securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	0
Fair value measurements, recurring [Member] \| Significant Other Observable Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	619,410	613,459
Fair value measurements, recurring [Member] \| Significant Other Observable Inputs, Level 2 [Member] \| U.S. Government agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale		22,558
Fair value measurements, recurring [Member] \| Significant Other Observable Inputs, Level 2 [Member] \| Residential MBSs [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	69,039	21,412
Fair value measurements, recurring [Member] \| Significant Other Observable Inputs, Level 2 [Member] \| Corporate debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	14,558	18,320
Fair value measurements, recurring [Member] \| Significant Other Observable Inputs, Level 2 [Member] \| Municipal securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	24,278
Fair value measurements, recurring [Member] \| Significant Unobservable Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	0	0
Fair value measurements, recurring [Member] \| Significant Unobservable Inputs, Level 3 [Member] \| U.S. Government agency securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale		0
Fair value measurements, recurring [Member] \| Significant Unobservable Inputs, Level 3 [Member] \| Residential MBSs [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	0	0
Fair value measurements, recurring [Member] \| Significant Unobservable Inputs, Level 3 [Member] \| Corporate debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	0	0
Fair value measurements, recurring [Member] \| Significant Unobservable Inputs, Level 3 [Member] \| Municipal securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	0
Agency Securities [Member] \| Fair value measurements, recurring [Member] \| Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	509,025	528,163
Agency Securities [Member] \| Fair value measurements, recurring [Member] \| Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] \| Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	0	0
Agency Securities [Member] \| Fair value measurements, recurring [Member] \| Significant Other Observable Inputs, Level 2 [Member] \| Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	509,025	528,163
Agency Securities [Member] \| Fair value measurements, recurring [Member] \| Significant Unobservable Inputs, Level 3 [Member] \| Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	0	0
Private-Label Securities [Member] \| Fair value measurements, recurring [Member] \| Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	2,510	23,006
Private-Label Securities [Member] \| Fair value measurements, recurring [Member] \| Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] \| Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	0	0
Private-Label Securities [Member] \| Fair value measurements, recurring [Member] \| Significant Other Observable Inputs, Level 2 [Member] \| Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	2,510	23,006
Private-Label Securities [Member] \| Fair value measurements, recurring [Member] \| Significant Unobservable Inputs, Level 3 [Member] \| Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Securities available for sale	$ 0	$ 0

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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