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Fair Value Information (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Carrying Amount [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Swaps	$ 18,753	$ 20,497
Significant Other Observable Inputs (Level 2) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Swaps	18,753	20,497
Fair Value, Measurements, Recurring [Member] | Carrying Amount [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total Assets	2,391,482	2,222,023
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total Assets
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total Assets	2,391,482	2,222,023
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total Assets
Interest Rate Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Carrying Amount [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Interest Rate Swaps	18,753	20,497
Interest Rate Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Interest Rate Swaps
Interest Rate Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Interest Rate Swaps	18,753	20,497
Interest Rate Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Interest Rate Swaps
Residential mortgage-backed securities[Member] | Fair Value, Measurements, Recurring [Member] | Carrying Amount [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS	938,891	888,000
Residential mortgage-backed securities[Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS
Residential mortgage-backed securities[Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS	938,891	888,000
Residential mortgage-backed securities[Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS
CMO's / REMIC's - Residential [Member] | Fair Value, Measurements, Recurring [Member] | Carrying Amount [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS	739,202	604,508
CMO's / REMIC's - Residential [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS
CMO's / REMIC's - Residential [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS	739,202	604,508
CMO's / REMIC's - Residential [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS
Government Agency [Member] | Fair Value, Measurements, Recurring [Member] | Carrying Amount [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS	37,362	46,507
Government Agency [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS
Government Agency [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS	37,362	46,507
Government Agency [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS
Municipal Bonds [Member] | Fair Value, Measurements, Recurring [Member] | Carrying Amount [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS	646,742	652,037
Municipal Bonds [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS
Municipal Bonds [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS	646,742	652,037
Municipal Bonds [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS
Other Securities [Member] | Fair Value, Measurements, Recurring [Member] | Carrying Amount [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS	10,474
Other Securities [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS
Other Securities [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS	10,474
Other Securities [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS
Investment Securities-AFS [Member] | Fair Value, Measurements, Recurring [Member] | Carrying Amount [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS	2,372,729	2,201,526
Investment Securities-AFS [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS
Investment Securities-AFS [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS	2,372,729	2,201,526
Investment Securities-AFS [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS
Interest Rate Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Carrying Amount [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Swaps	18,753	20,497
Interest Rate Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Swaps
Interest Rate Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Swaps	18,753	20,497
Interest Rate Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Swaps

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

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- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

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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 investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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