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Fair Value Information (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Carrying Amount [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Swaps	$ 24,663	$ 20,497
Significant Other Observable Inputs [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Swaps	24,663	20,497
Fair Value, Measurements, Recurring [Member] | Carrying Amount [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total Assets	2,284,194	2,222,023
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Total Assets	2,284,194	2,222,023
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	24,663	20,497
Interest Rate Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Interest Rate Swaps	24,663	20,497
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	863,322	888,000
Residential Mortgage-backed securities[Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS	863,322	888,000
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	718,520	604,508
CMO's / REMIC's - Residential [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS	718,520	604,508
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	32,362	46,507
Government Agency [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS	32,362	46,507
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	634,851	652,037
Municipal Bonds [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS	634,851	652,037
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	10,476	10,474
Other Securities [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS	10,476	10,474
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	2,259,531	2,201,526
Investment Securities-AFS [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Investment securities-AFS	2,259,531	2,201,526
Interest Rate Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Carrying Amount [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Swaps	24,663	20,497
Interest Rate Swaps [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Swaps	$ 24,663	$ 20,497

X

- 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.

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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