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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY INFORMATION (Allowance For Loan Losses And Loan Balances) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning balance $ 55,798 $ 56,000 $ 53,080 $ 60,339
Charge-offs (27,096) (9,120) (33,178) (20,119)
Recoveries 1,344 786 1,899 1,538
Provision 16,383 8,582 24,628 14,490
Ending balance 46,429 56,248 46,429 56,248
Loans individually evaluated for impairment 2,014 9,001 2,014 9,001
Loans collectively evaluated for impairment 44,415 47,247 44,415 47,247
Ending balance 46,429 56,248 46,429 56,248
Loans individually evaluated for impairment 52,972 [1] 95,194 [1] 52,972 [1] 95,194 [1]
Loans collectively evaluated for impairment 2,650,970 2,581,894 2,650,970 2,581,894
Ending balance 2,703,942 2,677,088 2,703,942 2,677,088
Commercial (Member)
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning balance 11,625 24,536 15,067 26,480
Charge-offs (7,704) (2,847) (10,035) (6,210)
Recoveries 797 210 850 338
Provision 5,173 3,337 4,009 4,628
Ending balance 9,891 25,236 9,891 25,236
Loans individually evaluated for impairment 629 2,304 629 2,304
Loans collectively evaluated for impairment 9,262 22,932 9,262 22,932
Ending balance 9,891 25,236 9,891 25,236
Loans individually evaluated for impairment 4,020 22,736 4,020 22,736
Loans collectively evaluated for impairment 807,981 1,308,304 807,981 1,308,304
Ending balance 812,001 1,331,040 812,001 1,331,040
Owner Occupied Commercial [Member]
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning balance 7,005   9,235  
Charge-offs (2,186)   (2,688)  
Recoveries     6  
Provision (728)   (2,462)  
Ending balance 4,091   4,091  
Loans individually evaluated for impairment 10   10  
Loans collectively evaluated for impairment 4,081   4,081  
Ending balance 4,091   4,091  
Loans individually evaluated for impairment 17,980   17,980  
Loans collectively evaluated for impairment 619,004   619,004  
Ending balance 636,984   636,984  
Commercial Mortgages (Member)
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning balance 10,530 11,866 7,556 10,564
Charge-offs (4,701) (1,060) (4,891) (1,307)
Recoveries 51 279 364 287
Provision 3,738 1,245 6,589 2,786
Ending balance 9,618 12,330 9,618 12,330
Loans individually evaluated for impairment 309 4,349 309 4,349
Loans collectively evaluated for impairment 9,309 7,981 9,309 7,981
Ending balance 9,618 12,330 9,618 12,330
Loans individually evaluated for impairment 5,219 20,177 5,219 20,177
Loans collectively evaluated for impairment 613,648 602,374 613,648 602,374
Ending balance 618,867 622,551 618,867 622,551
Construction (Member)
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning balance 8,917 6,658 4,074 10,019
Charge-offs (8,498) (1,846) (10,004) (7,072)
Recoveries 300 115 328 506
Provision 4,588 904 10,909 2,378
Ending balance 5,307 5,831 5,307 5,831
Loans individually evaluated for impairment 139 1,411 139 1,411
Loans collectively evaluated for impairment 5,168 4,420 5,168 4,420
Ending balance 5,307 5,831 5,307 5,831
Loans individually evaluated for impairment 5,656 31,586 5,656 31,586
Loans collectively evaluated for impairment 90,520 96,932 90,520 96,932
Ending balance 96,176 128,518 96,176 128,518
Residential (Member)
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning balance 6,400 3,763 6,544 4,028
Charge-offs (2,315) (899) (2,639) (1,306)
Recoveries 33 7 58 91
Provision 2,147 836 2,302 894
Ending balance 6,265 3,707 6,265 3,707
Loans individually evaluated for impairment 882 825 882 825
Loans collectively evaluated for impairment 5,383 2,882 5,383 2,882
Ending balance 6,265 3,707 6,265 3,707
Loans individually evaluated for impairment 16,083 17,567 16,083 17,567
Loans collectively evaluated for impairment 239,515 276,003 239,515 276,003
Ending balance 255,598 293,570 255,598 293,570
Consumer (Member)
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning balance 10,253 9,177 10,604 9,248
Charge-offs (1,692) (2,468) (2,921) (4,224)
Recoveries 163 175 293 316
Provision 1,617 2,260 2,365 3,804
Ending balance 10,341 9,144 10,341 9,144
Loans individually evaluated for impairment 45 112 45 112
Loans collectively evaluated for impairment 10,296 9,032 10,296 9,032
Ending balance 10,341 9,144 10,341 9,144
Loans individually evaluated for impairment 4,014 3,128 4,014 3,128
Loans collectively evaluated for impairment 280,302 298,281 280,302 298,281
Ending balance 284,316 301,409 284,316 301,409
Complexity Risk (Member)
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning balance 1,068 [2]      
Provision (152) [2]   916 [2]  
Ending balance 916 [2]   916 [2]  
Loans collectively evaluated for impairment 916 [2]   916 [2]  
Ending balance $ 916 [2]   $ 916 [2]  
[1] The difference between this amount and nonaccruing loans at June 30, 2012, represents accruing troubled debt restructured loans.
[2] Represents the portion of the allowance for loan losses established to account for the inherent complexity and uncertainty of estimates.