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Derivative Financial Instruments (Details) (USD $)
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1 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | |||||||||||||||||||
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Feb. 28, 2010
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Nov. 30, 2008
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Sep. 30, 2013
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Dec. 31, 2012
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Sep. 30, 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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Sep. 30, 2013
Non-designated hedging instruments
Risk Management
Gain on state tax credits, net
Interest rate cap contracts
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Sep. 30, 2012
Non-designated hedging instruments
Risk Management
Gain on state tax credits, net
Interest rate cap contracts
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Sep. 30, 2013
Non-designated hedging instruments
Risk Management
Gain on state tax credits, net
Interest rate cap contracts
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Sep. 30, 2012
Non-designated hedging instruments
Risk Management
Gain on state tax credits, net
Interest rate cap contracts
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Sep. 30, 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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Sep. 30, 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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Sep. 30, 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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Sep. 30, 2013
Non-designated hedging instruments
Client-Related
Interest and fees on loans
Interest rate swap contracts
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Sep. 30, 2012
Non-designated hedging instruments
Client-Related
Interest and fees on loans
Interest rate swap contracts
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Sep. 30, 2013
Non-designated hedging instruments
Client-Related
Interest and fees on loans
Interest rate swap contracts
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Sep. 30, 2012
Non-designated hedging instruments
Client-Related
Interest and fees on loans
Interest rate swap contracts
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Sep. 30, 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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Sep. 30, 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 | $ 1,100,000 | $ 1,700,000 | ||||||||||||||||||||||
| Derivative, Collateral, Right to Reclaim Cash | 730,000 | 3,270,000 | ||||||||||||||||||||||
| 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 | 139,223,000 | 126,962,000 | ||||||||||||||||||||
| Asset Derivatives, Fair Value | 14,000 | 13,000 | 1,114,000 | 1,741,000 | ||||||||||||||||||||
| Liability Derivatives, Fair Value | 0 | 0 | 1,114,000 | 1,979,000 | ||||||||||||||||||||
| Amount of Gain or (Loss) Recognized in Operations on Derivative | $ (9,000) | $ (14,000) | $ 1,000 | $ (79,000) | $ (32,000) | $ (103,000) | $ (205,000) | $ (354,000) | ||||||||||||||||