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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 |

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