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Business Combinations Estimated Fair Values Of Assets Acquired And Liabilities Assumed (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Sep. 10, 2010 First Bank [Member] | Sep. 10, 2010 Acquired Book Value [Member] First Bank [Member] | Sep. 10, 2010 Fair Value Adjustments [Member] First Bank [Member]
--- | --- | --- | --- | --- | ---
Assets |  |  |  |  |
Cash |  |  | $ 180,074 | $ 180,074 | $ 0
Loans |  |  | 133,117 | 135,219 | (2,102)
Premises and equipment |  |  | 12,951 | 5,266 | 7,685
Goodwill | 25,753 | 25,753 | 8,390 | 0 | 8,390
Core deposit intangible |  |  | 3,050 | 0 | 3,050
Other assets |  |  | 488 | 488 | 0
Total assets acquired |  |  | 338,070 | 321,047 | 17,023
Liabilities |  |  |  |  |
Deposits |  |  | 337,429 | 336,016 | 1,413
Securities sold under agreements to repurchase |  |  | 126 | 126 | 0
Other liabilities |  |  | 515 | 515 | 0
Total liabilities assumed |  |  | $ 338,070 | $ 336,657 | $ 1,413

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