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Loans and Allowance for Credit Losses - Recorded Investment and Unpaid Principal Balance for Impaired Loans with Associated Allowance (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment $ 51,007   $ 51,007   $ 58,014
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 63,003   63,003   88,596
Recorded investment 73,097   73,097   107,555
Unpaid principal balance 86,385   86,385   139,687
Related allowance 9,655   9,655   17,778
Impaired Financing Receivable, with Related Allowance, Recorded Investment 22,090   22,090   49,541
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 23,382   23,382   51,091
Average recorded investment 29,607 23,406 31,428 28,791  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 62 10 121 20  
Impaired Financing Receivable, Average Recorded Investment 78,112 82,037 87,506 82,098  
Interest Income Recognized 172 38 332 105  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 48,505 58,631 56,078 53,307  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 110 28 211 85  
Commercial Loan [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 15,069   15,069   8,080
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 16,119   16,119   8,983
Related allowance 6,627   6,627   10,331
Impaired Financing Receivable, with Related Allowance, Recorded Investment 10,707   10,707   26,532
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 11,383   11,383   27,412
Average recorded investment 18,486 17,441 20,534 19,101  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 12 3 31 6  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 12,853 7,735 12,333 10,291  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 55 3 106 21  
Construction Loans [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 2,474   2,474   8,491
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 6,014   6,014   35,555
Related allowance 267   267   300
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1,493   1,493   2,756
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 1,799   1,799   3,087
Average recorded investment 1,733 4,068 2,017 6,865  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 14 0 26 0  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 5,538 10,118 6,900 7,268  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 0 0 0 0  
Consumer Loan [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 257   257   256
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 268   268   256
Related allowance 0   0   0
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0   0   0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0   0   0
Average recorded investment 0 0 0 0  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 0 0 0 0  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 246 0 246 0  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 1 0 2 0  
Residential Portfolio Segment [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 9,017   9,017   7,928
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 9,640   9,640   8,401
Related allowance 1,943   1,943   780
Impaired Financing Receivable, with Related Allowance, Recorded Investment 4,139   4,139   2,695
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 4,148   4,148   2,696
Average recorded investment 3,680 644 3,117 797  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 8 7 12 14  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 9,003 15,082 8,732 9,219  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method 41 6 78 11  
Commercial Real Estate Portfolio Segment [Member]
          
Financing Receivable, Impaired [Line Items]          
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 24,190   24,190   33,259
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 30,962   30,962   35,401
Related allowance 818   818   6,367
Impaired Financing Receivable, with Related Allowance, Recorded Investment 5,751   5,751   17,558
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 6,052   6,052   17,896
Average recorded investment 5,708 1,253 5,760 2,028  
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method 28 0 52 0  
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 20,865 25,696 27,867 26,529  
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method $ 13 $ 19 $ 25 $ 53