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Federally Assisted Acquisition Of United Western Bank (Narrative) (Details) (USD $) | 0 Months Ended | 6 Months Ended |  | 6 Months Ended | 3 Months Ended | 6 Months Ended |
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Jan. 21, 2011 | Jun. 30, 2011 | Jul. 08, 2011 | Jun. 30, 2011 Minimum [Member] 0% Of Combined Covered Loan Losses [Member] | Jun. 30, 2011 Minimum [Member] Residential Mortgage Loans [Member] | Jun. 30, 2011 Minimum [Member] Other Loans [Member] | Jun. 30, 2011 Maximum [Member] FDIC [Member] | Jun. 30, 2011 Maximum [Member] OREO [Member] | Jun. 30, 2011 Maximum [Member] 0% Of Combined Covered Loan Losses [Member] | Jun. 30, 2011 Maximum [Member] Residential Mortgage Loans [Member] | Jun. 30, 2011 Maximum [Member] Other Loans [Member] | Jun. 30, 2011 Intrinsic Loss [Member] | Jun. 30, 2011 Net Loss Amount [Member] | Jun. 30, 2011 Asset Discount [Member] | Jun. 30, 2011 Shared Loss Assets [Member] | Jun. 30, 2011 FDIC [Member] | Jun. 30, 2011 OREO [Member] | Jun. 30, 2011 80% Of Combined Covered Loan Losses [Member] | Jun. 30, 2011 0% Of Combined Covered Loan Losses [Member] | Jun. 30, 2011 80% Of Combined Covered Loan Losses In Excess Of Stated Amount [Member] | Mar. 31, 2011 Acquisition Related [Member] | Jun. 30, 2011 Residential Mortgage Loans [Member] | Jun. 30, 2011 Other Loans [Member] | Jun. 30, 2011 United Western Bank [Member]
Discount on aggregate assets | $ 213,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposit premium | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of branches | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss cover, percentage |  |  |  |  | 0.00% | 30.00% |  |  |  | 80.00% | 80.00% |  |  |  |  | 80.00% | 80.00% |  |  |  |  |  |  |
Loss cover, amount |  |  |  |  | 32,489,000 | 111,517,000 | 57,653,000 | 227,032,000 |  | 57,653,000 | 227,032,000 |  |  |  |  | 32,489,000 | 111,517,000 |  |  |  |  |  |  |
True-up payment percentage excess |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total intrinsic loss |  | 294,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
True-up payment percentage |  |  |  |  |  |  |  |  |  |  |  | 20.00% | 20.00% | 25.00% | 3.50% |  |  |  |  |  |  |  |  |
True-up payment amount |  |  |  |  |  |  |  |  |  |  |  | 58,800,000 |  | 52,898,000 | 37,936,000 |  |  |  |  |  |  |  |  |
Estimated future true-up payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,423,000
Loss share agreement, term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 5 |
Loss share agreement, term in respect to loss recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 5 |
Adjusted Gain |  | 64,984 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bargain purchase gains |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 64,984,000 |  |  |
Deferred tax liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,448,000 |  |  |
FDIC repurchased loans |  | 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement To Purchase Assets And Liabilities Amount |  |  | 154,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Combined Covered Losses |  |  |  | 230,991 |  |  |  |  | 285,947 |  |  |  |  |  |  |  |  | 230,991 |  | 285,947 |  |  |  |
Percent Of FDIC Coverage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% | 0.00% | 80.00% |  |  |  |
Deposit Premium Amount |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash From FDIC At Settlement |  | $ 103,478 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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