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Loans (Details 4) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Recorded Investment      
With no related allowance recorded $ 65,606   $ 76,127
With an allowance recorded 46,971   62,498
Total impaired loans 112,577   138,625
Unpaid Principal Balance      
With no related allowance recorded 96,873   128,039
With an allowance recorded 59,052   70,614
Total impaired loans 155,925   198,653
Related Allowance      
With an allowance recorded 6,347   13,054
Total impaired loans 155,925   198,653
Average Recorded Investment      
With no related allowance recorded 70,867 103,980  
With an allowance recorded 54,734 99,488  
Total impaired loans 125,601 203,468  
Interest Income Recognized      
With no related allowance recorded 284 443  
With an allowance recorded 63 101  
Total impaired loans 347 544  
Commercial
      
Recorded Investment      
With no related allowance recorded 597   512
With an allowance recorded 494   653
Unpaid Principal Balance      
With no related allowance recorded 639   560
With an allowance recorded 551   740
Related Allowance      
With an allowance recorded 239   392
Average Recorded Investment      
With no related allowance recorded 555 177  
With an allowance recorded 573 3,352  
Commercial real estate | Owner occupied general purpose
      
Recorded Investment      
With no related allowance recorded 4,092   4,759
With an allowance recorded 1,999   7,985
Unpaid Principal Balance      
With no related allowance recorded 4,538   6,538
With an allowance recorded 2,768   8,291
Related Allowance      
With an allowance recorded 346   1,397
Average Recorded Investment      
With no related allowance recorded 4,425 6,542  
With an allowance recorded 4,992 10,000  
Commercial real estate | Owner occupied special purpose
      
Recorded Investment      
With no related allowance recorded 8,435   12,606
With an allowance recorded 3,799   3,958
Unpaid Principal Balance      
With no related allowance recorded 9,531   15,862
With an allowance recorded 5,764   5,448
Related Allowance      
With an allowance recorded 411   407
Average Recorded Investment      
With no related allowance recorded 10,521 12,486  
With an allowance recorded 3,879 9,713  
Commercial real estate | Non-owner occupied general purpose
      
Recorded Investment      
With no related allowance recorded 16,029   8,301
With an allowance recorded 9,490   8,397
Unpaid Principal Balance      
With no related allowance recorded 20,826   11,734
With an allowance recorded 12,081   9,942
Related Allowance      
With an allowance recorded 519   2,187
Average Recorded Investment      
With no related allowance recorded 12,165 10,809  
With an allowance recorded 8,943 11,750  
Interest Income Recognized      
With no related allowance recorded 135 76  
Commercial real estate | Non-owner occupied special purpose
      
Recorded Investment      
With no related allowance recorded 497   1,380
With an allowance recorded     434
Unpaid Principal Balance      
With no related allowance recorded 640   1,545
With an allowance recorded     437
Related Allowance      
With an allowance recorded     98
Average Recorded Investment      
With no related allowance recorded 938 2,852  
With an allowance recorded 217 5,367  
Interest Income Recognized      
With no related allowance recorded   15  
Commercial real estate | Retail properties
      
Recorded Investment      
With no related allowance recorded 5,462   4,586
With an allowance recorded 7,320   11,311
Unpaid Principal Balance      
With no related allowance recorded 8,343   5,920
With an allowance recorded 10,480   12,389
Related Allowance      
With an allowance recorded 1,319   3,506
Average Recorded Investment      
With no related allowance recorded 5,024 10,290  
With an allowance recorded 9,316 14,883  
Interest Income Recognized      
With no related allowance recorded   129  
Commercial real estate | Farm
      
Recorded Investment      
With no related allowance recorded 2,081   1,078
With an allowance recorded 197   496
Unpaid Principal Balance      
With no related allowance recorded 2,087   1,198
With an allowance recorded 197   496
Related Allowance      
With an allowance recorded 112   28
Average Recorded Investment      
With no related allowance recorded 1,580 907  
With an allowance recorded 346    
Construction | Homebuilder
      
Recorded Investment      
With no related allowance recorded 6,394   10,672
With an allowance recorded 2,376   2,204
Unpaid Principal Balance      
With no related allowance recorded 11,200   17,643
With an allowance recorded 3,665   2,816
Related Allowance      
With an allowance recorded 51   376
Average Recorded Investment      
With no related allowance recorded 8,533 16,636  
With an allowance recorded 2,290 7,792  
Interest Income Recognized      
With no related allowance recorded 55 67  
Construction | Land
      
Recorded Investment      
With no related allowance recorded 721   2,025
Unpaid Principal Balance      
With no related allowance recorded 1,491   6,222
Average Recorded Investment      
With no related allowance recorded 1,373 8,270  
With an allowance recorded   5,622  
Interest Income Recognized      
With no related allowance recorded   8  
Construction | Commercial speculative
      
Recorded Investment      
With no related allowance recorded 6,403   9,549
With an allowance recorded 4,223   4,668
Unpaid Principal Balance      
With no related allowance recorded 10,397   27,134
With an allowance recorded 5,465   5,371
Related Allowance      
With an allowance recorded 1,182   1,683
Average Recorded Investment      
With no related allowance recorded 7,976 6,102  
With an allowance recorded 4,446 10,615  
Construction | All other
      
Recorded Investment      
With no related allowance recorded 96   4,309
With an allowance recorded     380
Unpaid Principal Balance      
With no related allowance recorded 319   6,576
With an allowance recorded     422
Related Allowance      
With an allowance recorded     225
Average Recorded Investment      
With no related allowance recorded 2,202 5,030  
With an allowance recorded 190 381  
Residential | Investor
      
Recorded Investment      
With no related allowance recorded 3,455   2,981
With an allowance recorded 10,176   12,287
Unpaid Principal Balance      
With no related allowance recorded 12,581   11,927
With an allowance recorded 10,637   12,844
Related Allowance      
With an allowance recorded 940   1,808
Average Recorded Investment      
With no related allowance recorded 3,218 8,443  
With an allowance recorded 11,231 9,950  
Interest Income Recognized      
With no related allowance recorded   10  
With an allowance recorded   9  
Residential | Owner occupied
      
Recorded Investment      
With no related allowance recorded 9,592   11,880
With an allowance recorded 5,511   8,373
Unpaid Principal Balance      
With no related allowance recorded 12,093   13,487
With an allowance recorded 6,040   9,762
Related Allowance      
With an allowance recorded 508   626
Average Recorded Investment      
With no related allowance recorded 10,736 14,248  
With an allowance recorded 6,942 9,203  
Interest Income Recognized      
With no related allowance recorded 93 136  
With an allowance recorded 63 92  
Residential | Revolving and junior liens
      
Recorded Investment      
With no related allowance recorded 1,752   1,489
With an allowance recorded 1,386   1,352
Unpaid Principal Balance      
With no related allowance recorded 2,188   1,693
With an allowance recorded 1,404   1,656
Related Allowance      
With an allowance recorded 720   321
Average Recorded Investment      
With no related allowance recorded 1,621 1,184  
With an allowance recorded 1,369 860  
Interest Income Recognized      
With no related allowance recorded 1 2  
Consumer
      
Average Recorded Investment      
With no related allowance recorded   $ 4