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Derivative Financial Instruments (Details) (USD $)
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1 Months Ended | 3 Months Ended | 3 Months Ended | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Feb. 28, 2010
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Nov. 30, 2008
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Mar. 31, 2013
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Dec. 31, 2012
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Mar. 31, 2013
Non-designated hedging instruments
Risk Management
Interest rate cap contracts
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Dec. 31, 2012
Non-designated hedging instruments
Risk Management
Interest rate cap contracts
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Mar. 31, 2013
Non-designated hedging instruments
Risk Management
Gain on state tax credits, net
Interest rate cap contracts
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Mar. 31, 2012
Non-designated hedging instruments
Risk Management
Gain on state tax credits, net
Interest rate cap contracts
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Mar. 31, 2013
Non-designated hedging instruments
Risk Management
Other Assets
Interest rate cap contracts
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Dec. 31, 2012
Non-designated hedging instruments
Risk Management
Other Assets
Interest rate cap contracts
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Mar. 31, 2013
Non-designated hedging instruments
Risk Management
Other Liabilities
Interest rate cap contracts
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Dec. 31, 2012
Non-designated hedging instruments
Risk Management
Other Liabilities
Interest rate cap contracts
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Mar. 31, 2013
Non-designated hedging instruments
Client-Related
Interest rate swap contracts
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Dec. 31, 2012
Non-designated hedging instruments
Client-Related
Interest rate swap contracts
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Mar. 31, 2013
Non-designated hedging instruments
Client-Related
Interest and fees on loans
Interest rate swap contracts
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Mar. 31, 2012
Non-designated hedging instruments
Client-Related
Interest and fees on loans
Interest rate swap contracts
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Mar. 31, 2013
Non-designated hedging instruments
Client-Related
Other Assets
Interest rate swap contracts
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Dec. 31, 2012
Non-designated hedging instruments
Client-Related
Other Assets
Interest rate swap contracts
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Mar. 31, 2013
Non-designated hedging instruments
Client-Related
Other Liabilities
Interest rate swap contracts
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Dec. 31, 2012
Non-designated hedging instruments
Client-Related
Other Liabilities
Interest rate swap contracts
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| Derivative [Line Items] | ||||||||||||||||||||
| Unrealized Gain Derivative Instruments | $ 1,600,000 | |||||||||||||||||||
| Derivative, Collateral, Right to Reclaim Cash | 3,100,000 | 3,300,000 | ||||||||||||||||||
| Amount Paid to Enter Into a Series of Interest Rate Caps | 751,000 | 2,100,000 | ||||||||||||||||||
| Summary of Derivative Instruments [Abstract] | ||||||||||||||||||||
| Notional Amount | 34,050,000 | 49,050,000 | 121,143,000 | 126,962,000 | ||||||||||||||||
| Asset Derivatives, Fair Value | 12,000 | 13,000 | 1,610,000 | 1,741,000 | ||||||||||||||||
| Liability Derivatives, Fair Value | 0 | 0 | 1,721,000 | 1,979,000 | ||||||||||||||||
| Amount of Gain or (Loss) Recognized in Operations on Derivative | $ (1,000) | $ (26,000) | $ (105,000) | $ (141,000) | ||||||||||||||||