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Allowance for loan losses (Details) (USD $)
In Thousands
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2011
Legacy Loans [Member]
C & I [Member]
Jun. 30, 2011
Legacy Loans [Member]
C & I [Member]
Jun. 30, 2011
Legacy Loans [Member]
CRE [Member]
Jun. 30, 2011
Legacy Loans [Member]
CRE [Member]
Jun. 30, 2011
Legacy Loans [Member]
Construction [Member]
Jun. 30, 2011
Legacy Loans [Member]
Construction [Member]
Jun. 30, 2011
Legacy Loans [Member]
Leases [Member]
Jun. 30, 2011
Legacy Loans [Member]
Leases [Member]
Jun. 30, 2011
Legacy Loans [Member]
Installment [Member]
Jun. 30, 2011
Legacy Loans [Member]
Installment [Member]
Jun. 30, 2011
Legacy Loans [Member]
Home Equity Lines [Member]
Jun. 30, 2011
Legacy Loans [Member]
Home Equity Lines [Member]
Jun. 30, 2011
Legacy Loans [Member]
Credit cards [Member]
Jun. 30, 2011
Legacy Loans [Member]
Credit cards [Member]
Jun. 30, 2011
Legacy Loans [Member]
Residential Mortgage [Member]
Jun. 30, 2011
Legacy Loans [Member]
Residential Mortgage [Member]
Jun. 30, 2011
Legacy Loans [Member]
Jun. 30, 2011
Legacy Loans [Member]
Dec. 31, 2010
Legacy Loans [Member]
Jun. 30, 2011
Acquired Loans (Noncovered) [Member]
Dec. 31, 2010
Acquired Loans (Noncovered) [Member]
Jun. 30, 2010
Acquired Loans (Noncovered) [Member]
Jun. 30, 2011
Covered Loans [Member]
Dec. 31, 2010
Covered Loans [Member]
Legacy Loans                                                
Beginning Balance $ 31,649 $ 29,764 $ 33,128 $ 32,026 $ 7,639 $ 7,180 $ 480 $ 475 $ 20,709 $ 21,555 $ 6,883 $ 7,217 $ 8,712 $ 11,107 $ 5,490 $ 5,366 $ 114,690 $ 114,690            
Charge-offs (4,274) (8,989) (2,068) (4,459) (1,337) (2,695) (127) (127) (6,202) (14,293) (2,762) (5,577) (2,297) (4,615) (1,351) (3,015) (20,958) (43,770)            
Recoveries 188 714 47 48 293 374 2 34 3,718 7,437 483 1,182 557 1,204 29 118 5,317 11,111            
Provision 803 6,877 2,379 5,331 1,281 3,017 (2) (29) (136) 3,390 2,538 4,320 1,431 707 1,844 3,543 10,138 27,156            
Ending Balance 28,366 28,366 32,946 32,946 7,876 7,876 353 353 18,089 18,089 7,142 7,142 8,403 8,403 6,012 6,012 109,187 109,187            
Ending Balance: Individually Evaluated 290 290 3,169 3,169 1,038 1,038 0 0 662 662 20 20 28 28 1,209 1,209 6,416 6,416            
Ending Balance: Collectively Evaluated 28,076 28,076 29,777 29,777 6,838 6,838 353 353 17,427 17,427 7,122 7,122 8,375 8,375 4,803 4,803 102,771 102,771            
Loans:                                                
Ending Balance 2,415,647 2,415,647 1,973,315 1,973,315 253,379 253,379 57,634 57,634 1,256,233 1,256,233 716,789 716,789 143,828 143,828 399,190 399,190 7,216,015 7,216,015 6,936,587 192,204 265,501 323,500 1,515,683 1,688,149
Ending Balance: Individually Evaluated 3,573 3,573 45,008 45,008 9,407 9,407 0 0 15,703 15,703 1,242 1,242 2,453 2,453 14,851 14,851 92,237 92,237            
Ending Balance: Collectively Evaluated $ 2,412,074 $ 2,412,074 $ 1,928,307 $ 1,928,307 $ 243,972 $ 243,972 $ 57,634 $ 57,634 $ 1,240,530 $ 1,240,530 $ 715,547 $ 715,547 $ 141,375 $ 141,375 $ 384,339 $ 384,339 $ 7,123,778 $ 7,123,778