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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2012
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Level 1 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2011
Level 1 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2012
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Level 2 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2011
Level 2 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2012
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2011
Level 3 [Member]
Fair Value, Measurements, Nonrecurring [Member]
Jun. 30, 2012
US Government Agencies [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
US Government Agencies [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
US Government Agencies [Member]
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
US Government Agencies [Member]
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
US Government Agencies [Member]
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
US Government Agencies [Member]
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
US Government Agencies [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
US Government Agencies [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
US Treasury [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
US Treasury [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
US Treasury [Member]
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
US Treasury [Member]
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
US Treasury [Member]
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
US Treasury [Member]
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
US Treasury [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
US Treasury [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Pass through securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Pass through securities [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Pass through securities [Member]
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Pass through securities [Member]
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Pass through securities [Member]
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Pass through securities [Member]
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Pass through securities [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Pass through securities [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Taxable state and political subdivisions [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Taxable state and political subdivisions [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Taxable state and political subdivisions [Member]
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Taxable state and political subdivisions [Member]
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Taxable state and political subdivisions [Member]
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Taxable state and political subdivisions [Member]
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Taxable state and political subdivisions [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Taxable state and political subdivisions [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Tax exempt states and political subdivisions [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Tax exempt states and political subdivisions [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Tax exempt states and political subdivisions [Member]
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Tax exempt states and political subdivisions [Member]
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Tax exempt states and political subdivisions [Member]
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Tax exempt states and political subdivisions [Member]
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Tax exempt states and political subdivisions [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Tax exempt states and political subdivisions [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Corporate obligations [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Corporate obligations [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Corporate obligations [Member]
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Corporate obligations [Member]
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Corporate obligations [Member]
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Corporate obligations [Member]
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Corporate obligations [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Corporate obligations [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Agency-issued collateralized mortgage obligations [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Agency-issued collateralized mortgage obligations [Member]
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Agency-issued collateralized mortgage obligations [Member]
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Agency-issued collateralized mortgage obligations [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Investments in mutual funds and other equities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Investments in mutual funds and other equities [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Investments in mutual funds and other equities [Member]
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Investments in mutual funds and other equities [Member]
Level 1 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Investments in mutual funds and other equities [Member]
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Investments in mutual funds and other equities [Member]
Level 2 [Member]
Fair Value, Measurements, Recurring [Member]
Jun. 30, 2012
Investments in mutual funds and other equities [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2011
Investments in mutual funds and other equities [Member]
Level 3 [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                                                                                                                                                                        
Non-covered impaired loans                     $ 44,713 [1] $ 44,845 [1]     $ 0 [1] $ 0 [1]     $ 0 [1] $ 0 [1]     $ 44,713 [1] $ 44,845 [1]                                                                                                                        
Non-covered other real estate owned 4,414   4,414     1,976         4,414 [2] 1,976 [2]     0 [2] 0 [2]     0 [2] 0 [2]     4,414 [2] 1,976 [2]                                                                                                                        
Covered other real estate owned 23,000   23,000     26,622         23,000 [2] 26,622 [2]     0 [2] 0 [2]     0 [2] 0 [2]     23,000 [2] 26,622 [2]                                                                                                                        
Total fair value measurements, nonrecurring                     72,127 73,443     0 0     0 0     72,127 73,443                                                                                                                        
Total losses for the period, non-covered impaired loans                     (6,483) [1] (8,182) [1]                                                                                                                                                
Total losses for the period, non covered other real estate owned                     (549) [2] (272) [2]                                                                                                                                                
Total losses for the period, covered other real estate owned                     0 [2] 0 [2]                                                                                                                                                
Total losses for the period 2,114 2,474 4,072 4,763             (7,032) (8,454)                                                                                                                                                
Percentage deducted of the appraised value to cover selling costs (in hundreths)     10.00%                                                                                                                                                                  
ASSETS                                                                                                                                                                        
Cash and cash equivalents, fair value                 22,871 25,399     22,871 25,399     0 0     0 0                                                                                                                            
Cash and cash equivalents, carrying value 117,982 163,244 117,982 163,244   105,913   81,687 22,871 25,399                                                                                                                                                    
Interest bearing deposit, fair value                 95,111 80,514     95,111 80,514     0 0     0 0                                                                                                                            
Interest bearing deposit, carrying value                 95,111 80,514                                                                                                                                                    
Available-for-sale securities fair value 322,677   322,677     295,955     322,677 295,955     0 0     322,677 295,955       0                                                                                                                            
Available-for-sale securities carrying value                 322,677 295,955                                                                                                                                                    
FHLB stock fair value                 7,576 7,576     7,576 7,576     0 0     0 0                                                                                                                            
Federal Home Loan Bank stock 7,576   7,576     7,576     7,576 7,576                                                                                                                                                    
Marketable securities - fair value                 322,677 295,955     0 0     322,677 295,955     0 0     81,468 76,574 0 0 81,468 76,574 0 0 15,042 42,597 0 0 15,042 42,597 0 0 149,156 117,398 0 0 149,156 117,398 0 0 10,143 9,758 0 0 10,143 9,758 0 0 44,876 37,335 0 0 44,876 37,335 0 0 10,361 10,287 0 0 10,361 10,287 0 0 9,627 0 9,627 0 2,004 2,006 0 0 2,004 2,006 0 0
Loans held-for-sale - fair value                 12,521 22,421     0 0     12,521 22,421     0 0                                                                                                                            
Loans held-for-sale carrying value                 12,521 22,421                                                                                                                                                    
Non-covered loans fair value                 803,435 796,663     0 0     0 0     803,435 796,663                                                                                                                            
Non-covered loans carrying value                 814,826 812,830                                                                                                                                                    
Covered loans fair value                 280,966 304,145     0 0     0 0     280,966 304,145                                                                                                                            
Covered loans carrying value                 242,724 269,081                                                                                                                                                    
Bank owned life insurance fair value                 17,628 17,513     17,628 17,513     0 0     0 0                                                                                                                            
Bank owned life insurance carrying value 17,628   17,628     17,513                                                                                                                                                            
FDIC indemnification asset fair value                 28,098 41,041     0 0     0 0     28,098 41,041                                                                                                                            
FDIC indemnification asset carrying value 54,867 89,906 54,867 89,906 60,898 65,586 97,274 106,067 54,867 65,586                                                                                                                                                    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]                                                                                                                                                                        
Deposits fair value                 1,452,921 1,471,615     0 0     0 0     1,452,921 1,471,615                                                                                                                            
Deposits carrying value 1,449,910   1,449,910     1,466,344     1,449,910 1,466,344                                                                                                                                                    
Junior subordinated debentures fair value                 12,157 9,802     0 0     0 0     12,157 9,802                                                                                                                            
Junior subordinated debenture carrying value                 $ 25,774 $ 25,774                                                                                                                                                    
[1] Represents carrying value and related specific valuation allowances, which are included in the allowance for loan losses.
[2] Represents the fair value and related losses of foreclosed real estate and other collateral owned that were measured at fair value subsequent to their initial classification as non-covered other real estate owned and covered other real estate owned.