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Allowance for Loan Losses (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Activity in the allowance for loan losses          
Balance at beginning of period $ 18,313 $ 22,142 $ 19,241 $ 22,336  
Provision for loan losses 3,199 1,066 5,659 2,430  
Recoveries of loans previously charged off 569 473 1,157 1,107  
Loans charged off (1,989) (2,056) (5,966) (4,248)  
Balance at end of period 20,092 21,625 20,092 21,625  
Increase in provision for decrease in FDIC indemnification asset (1,410) 286 (914) 104  
Ending Balance Attributable to Loans          
Individually evaluated for impairment 4,429   4,429   3,261
Collectively evaluated for impairment 15,415   15,415   14,841
Acquired with deteriorated credit quality 248   248   1,139
Balance at end of period 20,092 21,625 20,092 21,625  
Loans          
Individually evaluated for impairment 22,895   22,895   27,606
Collectively evaluated for impairment 1,839,361   1,839,361   1,820,292
Acquired with deteriorated credit quality 25,145   25,145   56,386
Ending Balance 1,887,401   1,887,401   1,904,283
Commercial
          
Activity in the allowance for loan losses          
Balance at beginning of period 11,448 12,536 12,119 12,809  
Provision for loan losses 1,880 1,320 2,877 2,009  
Recoveries of loans previously charged off 206 336 396 435  
Loans charged off (344) (1,306) (2,202) (2,367)  
Balance at end of period 13,190 12,886 13,190 12,886  
Ending Balance Attributable to Loans          
Individually evaluated for impairment 4,239   4,239   3,071
Collectively evaluated for impairment 8,709   8,709   8,264
Acquired with deteriorated credit quality 242   242   784
Balance at end of period 13,190 12,886 13,190 12,886  
Loans          
Individually evaluated for impairment 21,682   21,682   25,393
Collectively evaluated for impairment 1,065,891   1,065,891   1,036,963
Acquired with deteriorated credit quality 19,695   19,695   43,389
Ending Balance 1,107,268   1,107,268   1,105,745
Residential
          
Activity in the allowance for loan losses          
Balance at beginning of period 2,092 3,251 2,728 2,873  
Provision for loan losses 582 607 1,265 1,294  
Recoveries of loans previously charged off 22 33 39 87  
Loans charged off (572) (327) (1,908) (690)  
Balance at end of period 2,124 3,564 2,124 3,564  
Ending Balance Attributable to Loans          
Individually evaluated for impairment 190   190   190
Collectively evaluated for impairment 1,928   1,928   2,183
Acquired with deteriorated credit quality 6   6   355
Balance at end of period 2,124 3,564 2,124 3,564  
Loans          
Individually evaluated for impairment 1,213   1,213   2,213
Collectively evaluated for impairment 495,404   495,404   492,139
Acquired with deteriorated credit quality 5,442   5,442   12,986
Ending Balance 502,059   502,059   507,338
Consumer
          
Activity in the allowance for loan losses          
Balance at beginning of period 3,806 4,054 3,889 4,551  
Provision for loan losses 670 243 989 33  
Recoveries of loans previously charged off 341 104 722 585  
Loans charged off (1,073) (423) (1,856) (1,191)  
Balance at end of period 3,744 3,978 3,744 3,978  
Ending Balance Attributable to Loans          
Collectively evaluated for impairment 3,744   3,744   3,889
Balance at end of period 3,744 3,978 3,744 3,978  
Loans          
Collectively evaluated for impairment 278,066   278,066   291,190
Acquired with deteriorated credit quality 8   8   11
Ending Balance 278,074   278,074   291,201
Unallocated
          
Activity in the allowance for loan losses          
Balance at beginning of period 967 2,301 506 2,103  
Provision for loan losses 67 (1,104) 528 (906)  
Balance at end of period 1,034 1,197 1,034 1,197  
Ending Balance Attributable to Loans          
Collectively evaluated for impairment 1,034   1,034   505
Balance at end of period $ 1,034 $ 1,197 $ 1,034 $ 1,197