Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
RECURRING FAIR VALUE MEASUREMENTS: [Member]
ASSETS
TRADING SECURITIES			$ 8,240
ASSETS
TOTAL RECURRING FAIR VALUE MEASUREMENTS	346,857		315,506
RECURRING FAIR VALUE MEASUREMENTS: [Member] | U.S. Government Agency Securities [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:	20,907
RECURRING FAIR VALUE MEASUREMENTS: [Member] | Agency Mortgage-Backed Securities [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:	211,745		238,391
RECURRING FAIR VALUE MEASUREMENTS: [Member] | Agency Collateralized Mortgage Obligations [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:	73,372		53,801
RECURRING FAIR VALUE MEASUREMENTS: [Member] | Private Mortgage-Backed Securities [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:	4,112		6,110
RECURRING FAIR VALUE MEASUREMENTS: [Member] | Single Issuer Trust Preferred Securities Issued by Banks [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:			4,210
RECURRING FAIR VALUE MEASUREMENTS: [Member] | Pooled Trust Preferred Securities Issued by Banks and Insurers [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:	3,052		2,820
RECURRING FAIR VALUE MEASUREMENTS: [Member] | Marketable Equity Securities [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:	9,968
RECURRING FAIR VALUE MEASUREMENTS: [Member] | LOANS HELD FOR SALE [Member]
ASSETS
Assets, Fair Value Disclosure, Recurring	42,393		20,500
RECURRING FAIR VALUE MEASUREMENTS: [Member] | DERIVATIVE INSTRUMENTS [Member]
ASSETS
Assets, Fair Value Disclosure, Recurring	32,672		25,841
RECURRING FAIR VALUE MEASUREMENTS: [Member] | DERIVATIVE INSTRUMENTS [Member]
LIABILITIES
Liabilities, Fair Value Disclosure, Recurring	51,364		44,407
NONRECURRING FAIR VALUE MEASUREMENTS: [Member]
ASSETS
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS	16,201		43,519
NONRECURRING FAIR VALUE MEASUREMENTS: [Member] | IMPAIRED LOANS [Member]
ASSETS
Assets, Fair Value Disclosure, Nonrecurring			36,861	[1]
NONRECURRING FAIR VALUE MEASUREMENTS: [Member] | COLLATERAL DEPENDENT IMPAIRED LOANS [Member]
ASSETS
Assets, Fair Value Disclosure, Nonrecurring	7,450		9,000	[1]
NONRECURRING FAIR VALUE MEASUREMENTS: [Member] | OTHER REAL ESTATE OWNED [Member]
ASSETS
Assets, Fair Value Disclosure, Nonrecurring	8,751		6,658
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member]
ASSETS
TRADING SECURITIES			8,240
ASSETS
TOTAL RECURRING FAIR VALUE MEASUREMENTS	9,968		8,240
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | U.S. Government Agency Securities [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | Agency Mortgage-Backed Securities [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | Agency Collateralized Mortgage Obligations [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | Private Mortgage-Backed Securities [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | Single Issuer Trust Preferred Securities Issued by Banks [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | Pooled Trust Preferred Securities Issued by Banks and Insurers [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | Marketable Equity Securities [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:	9,968
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | LOANS HELD FOR SALE [Member]
ASSETS
Assets, Fair Value Disclosure, Recurring
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | DERIVATIVE INSTRUMENTS [Member]
ASSETS
Assets, Fair Value Disclosure, Recurring
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | DERIVATIVE INSTRUMENTS [Member]
LIABILITIES
Liabilities, Fair Value Disclosure, Recurring
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | NONRECURRING FAIR VALUE MEASUREMENTS: [Member]
ASSETS
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | NONRECURRING FAIR VALUE MEASUREMENTS: [Member] | IMPAIRED LOANS [Member]
ASSETS
Assets, Fair Value Disclosure, Nonrecurring				[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | NONRECURRING FAIR VALUE MEASUREMENTS: [Member] | COLLATERAL DEPENDENT IMPAIRED LOANS [Member]
ASSETS
Assets, Fair Value Disclosure, Nonrecurring
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | NONRECURRING FAIR VALUE MEASUREMENTS: [Member] | OTHER REAL ESTATE OWNED [Member]
ASSETS
Assets, Fair Value Disclosure, Nonrecurring
Significant Other Observable Inputs (Level 2) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member]
ASSETS
TRADING SECURITIES
ASSETS
TOTAL RECURRING FAIR VALUE MEASUREMENTS	420,719		294,126
Significant Other Observable Inputs (Level 2) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | U.S. Government Agency Securities [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:	20,907
Significant Other Observable Inputs (Level 2) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | Agency Mortgage-Backed Securities [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:	211,745		238,391
Significant Other Observable Inputs (Level 2) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | Agency Collateralized Mortgage Obligations [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:	73,372		53,801
Significant Other Observable Inputs (Level 2) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | Private Mortgage-Backed Securities [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:
Significant Other Observable Inputs (Level 2) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | Single Issuer Trust Preferred Securities Issued by Banks [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:
Significant Other Observable Inputs (Level 2) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | Pooled Trust Preferred Securities Issued by Banks and Insurers [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:
Significant Other Observable Inputs (Level 2) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | Marketable Equity Securities [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:
Significant Other Observable Inputs (Level 2) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | LOANS HELD FOR SALE [Member]
ASSETS
Assets, Fair Value Disclosure, Recurring	42,393		20,500
Significant Other Observable Inputs (Level 2) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | DERIVATIVE INSTRUMENTS [Member]
ASSETS
Assets, Fair Value Disclosure, Recurring	32,672		25,841
Significant Other Observable Inputs (Level 2) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | DERIVATIVE INSTRUMENTS [Member]
LIABILITIES
Liabilities, Fair Value Disclosure, Recurring	51,364		44,407
Significant Other Observable Inputs (Level 2) [Member] | NONRECURRING FAIR VALUE MEASUREMENTS: [Member]
ASSETS
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS
Significant Other Observable Inputs (Level 2) [Member] | NONRECURRING FAIR VALUE MEASUREMENTS: [Member] | IMPAIRED LOANS [Member]
ASSETS
Assets, Fair Value Disclosure, Nonrecurring				[1]
Significant Other Observable Inputs (Level 2) [Member] | NONRECURRING FAIR VALUE MEASUREMENTS: [Member] | COLLATERAL DEPENDENT IMPAIRED LOANS [Member]
ASSETS
Assets, Fair Value Disclosure, Nonrecurring
Significant Other Observable Inputs (Level 2) [Member] | NONRECURRING FAIR VALUE MEASUREMENTS: [Member] | OTHER REAL ESTATE OWNED [Member]
ASSETS
Assets, Fair Value Disclosure, Nonrecurring
Significant Unobservable Inputs (Level 3) [Member] | Private Mortgage-Backed Securities [Member]
ASSETS
Assets, Fair Value Disclosure, Recurring	4,112
Significant Unobservable Inputs (Level 3) [Member] | IMPAIRED LOANS [Member]
ASSETS
Assets, Fair Value Disclosure, Recurring	7,450	[2]
Significant Unobservable Inputs (Level 3) [Member] | OTHER REAL ESTATE OWNED [Member]
ASSETS
Assets, Fair Value Disclosure, Recurring	8,751	[2]
Significant Unobservable Inputs (Level 3) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member]
ASSETS
TRADING SECURITIES
ASSETS
TOTAL RECURRING FAIR VALUE MEASUREMENTS	7,164		13,140
Significant Unobservable Inputs (Level 3) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | U.S. Government Agency Securities [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:
Significant Unobservable Inputs (Level 3) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | Agency Mortgage-Backed Securities [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:
Significant Unobservable Inputs (Level 3) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | Agency Collateralized Mortgage Obligations [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:
Significant Unobservable Inputs (Level 3) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | Private Mortgage-Backed Securities [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:	4,112		6,110
Significant Unobservable Inputs (Level 3) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | Single Issuer Trust Preferred Securities Issued by Banks [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:			4,210
Significant Unobservable Inputs (Level 3) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | Pooled Trust Preferred Securities Issued by Banks and Insurers [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:	3,052		2,820
Significant Unobservable Inputs (Level 3) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | Marketable Equity Securities [Member]
ASSETS
SECURITIES AVAILABLE FOR SALE:
Significant Unobservable Inputs (Level 3) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | LOANS HELD FOR SALE [Member]
ASSETS
Assets, Fair Value Disclosure, Recurring
Significant Unobservable Inputs (Level 3) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | DERIVATIVE INSTRUMENTS [Member]
ASSETS
Assets, Fair Value Disclosure, Recurring
Significant Unobservable Inputs (Level 3) [Member] | RECURRING FAIR VALUE MEASUREMENTS: [Member] | DERIVATIVE INSTRUMENTS [Member]
LIABILITIES
Liabilities, Fair Value Disclosure, Recurring
Significant Unobservable Inputs (Level 3) [Member] | NONRECURRING FAIR VALUE MEASUREMENTS: [Member]
ASSETS
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS	16,201		43,519
Significant Unobservable Inputs (Level 3) [Member] | NONRECURRING FAIR VALUE MEASUREMENTS: [Member] | IMPAIRED LOANS [Member]
ASSETS
Assets, Fair Value Disclosure, Nonrecurring			36,861	[1]
Significant Unobservable Inputs (Level 3) [Member] | NONRECURRING FAIR VALUE MEASUREMENTS: [Member] | COLLATERAL DEPENDENT IMPAIRED LOANS [Member]
ASSETS
Assets, Fair Value Disclosure, Nonrecurring	7,450
Significant Unobservable Inputs (Level 3) [Member] | NONRECURRING FAIR VALUE MEASUREMENTS: [Member] | OTHER REAL ESTATE OWNED [Member]
ASSETS
Assets, Fair Value Disclosure, Nonrecurring	8,751		6,658
Total Gains (Losses) [Member] | NONRECURRING FAIR VALUE MEASUREMENTS: [Member]
ASSETS
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS	(676)		(2,682)
Total Gains (Losses) [Member] | NONRECURRING FAIR VALUE MEASUREMENTS: [Member] | IMPAIRED LOANS [Member]
ASSETS
Assets, Fair Value Disclosure, Nonrecurring			(2,682)	[1]
Total Gains (Losses) [Member] | NONRECURRING FAIR VALUE MEASUREMENTS: [Member] | COLLATERAL DEPENDENT IMPAIRED LOANS [Member]
ASSETS
Assets, Fair Value Disclosure, Nonrecurring	(676)
Total Gains (Losses) [Member] | NONRECURRING FAIR VALUE MEASUREMENTS: [Member] | OTHER REAL ESTATE OWNED [Member]
ASSETS
Assets, Fair Value Disclosure, Nonrecurring

[1] Represents all impaired loans with an associated specific reserve at December 31, 2011. Included in this amount are $9.0 million of collateral dependent loans

[2] Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. Appraisals may be adjusted by management for qualitative factors such as economic factors and estimated liquidation expenses. The range of these possible adjustments may vary.