Annual report pursuant to Section 13 and 15(d)

Loans - Allowance for Loan Losses by Portfolio Segment (Detail)

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Loans - Allowance for Loan Losses by Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Allowance for Loan Losses:    
Beginning Balance $ 89,936 $ 146,059
Charge-Offs 38,227 78,652
Recoveries on Loans Previously Charged Off 4,439 9,993
Provision 7,157 12,536
Ending Balance 63,305 89,936
Ending Balance: Individually Evaluated for Impairment 6,232 23,382
Ending Balance: Collectively Evaluated for Impairment 57,073 66,554
Loans Receivable:    
Ending Balance 2,048,560 1,938,740
Ending Balance: Individually Evaluated for Impairment 54,744 121,689
Ending Balance: Collectively Evaluated for Impairment 1,993,816 1,817,051
Real Estate Loans [Member]
    
Allowance for Loan Losses:    
Beginning Balance 19,637 32,766
Charge-Offs 11,382 18,539
Recoveries on Loans Previously Charged Off 583 2,794
Provision 9,342 2,616
Ending Balance 18,180 19,637
Ending Balance: Individually Evaluated for Impairment 161 3,618
Ending Balance: Collectively Evaluated for Impairment 18,019 16,019
Loans Receivable:    
Ending Balance 888,872 749,920
Ending Balance: Individually Evaluated for Impairment 8,819 38,699
Ending Balance: Collectively Evaluated for Impairment 880,053 711,221
Commercial and Industrial Loans [Member]
    
Allowance for Loan Losses:    
Beginning Balance 66,005 108,986
Charge-Offs 25,897 59,498
Recoveries on Loans Previously Charged Off 3,758 7,093
Provision (1,938) 9,424
Ending Balance 41,928 66,005
Ending Balance: Individually Evaluated for Impairment 5,456 19,738
Ending Balance: Collectively Evaluated for Impairment 36,472 46,267
Loans Receivable:    
Ending Balance 1,123,012 1,145,474
Ending Balance: Individually Evaluated for Impairment 44,273 82,244
Ending Balance: Collectively Evaluated for Impairment 1,078,739 1,063,230
Consumer Loans [Member]
    
Allowance for Loan Losses:    
Beginning Balance 2,243 2,079
Charge-Offs 948 615
Recoveries on Loans Previously Charged Off 98 106
Provision 887 673
Ending Balance 2,280 2,243
Ending Balance: Individually Evaluated for Impairment 615 26
Ending Balance: Collectively Evaluated for Impairment 1,665 2,217
Loans Receivable:    
Ending Balance 36,676 43,346
Ending Balance: Individually Evaluated for Impairment 1,652 746
Ending Balance: Collectively Evaluated for Impairment 35,024 42,600
Unallocated [Member]
    
Allowance for Loan Losses:    
Beginning Balance 2,051 2,228
Charge-Offs      
Recoveries on Loans Previously Charged Off      
Provision (1,134) (177)
Ending Balance 917 2,051
Ending Balance: Individually Evaluated for Impairment      
Ending Balance: Collectively Evaluated for Impairment 917 2,051
Loans Receivable:    
Ending Balance      
Ending Balance: Individually Evaluated for Impairment      
Ending Balance: Collectively Evaluated for Impairment