Business Combinations (Details)	3 Months Ended
Mar. 31, 2013
Business Combinations (Additional Textual) [Abstract]
Maximum period of accrued interest on loan under agreement	90 days
Granite [Member]
Business Combinations (Textual) [Abstract]
FDIC losses	80.00%
Loss recoveries on the covered assets acquired	80.00%
Loss sharing arrangements, Minimum	5 years
Loss sharing arrangements, Maximum	10 years
Loss recovery provisions, Minimum	8 years
Loss recovery provisions, Maximum	10 years

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Maximum period of accrued interest on loan under agreement.

No definition available.

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Percentage of absorption of losses by FDIC.

No definition available.

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Percentage of share in loss recoveries on covered assets by FDIC.

No definition available.

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Period of loss recovery provision for non-single family residential.

No definition available.

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Period of loss recovery provision for single family residential.

No definition available.

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Period of Loss sharing arrangements for non-single family residential.

No definition available.

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Period of loss sharing arrangements for single family residential.

No definition available.

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