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Loans - Information on Impaired Loans, Disaggregated by Loan Class (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] |  |  |  |  |
Recorded Investment | $ 45,674 |  | $ 45,674 |  | $ 54,744
Unpaid Principal Balance | 51,814 |  | 51,814 |  | 61,561
With No Related Allowance Recorded | 31,220 |  | 31,220 |  | 28,830
With an Allowance Recorded | 14,454 |  | 14,454 |  | 25,914
Related Allowance | 5,424 |  | 5,424 |  | 6,231
Average Recorded Investment | 46,117 | 60,742 | 48,050 | 64,508 |
Interest Income Recognized | 926 | 1,239 | 1,822 | 2,345 |
Real estate loans [Member] | Retail [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 1,818 |  | 1,818 |  | 2,930
Unpaid Principal Balance | 1,818 |  | 1,818 |  | 3,024
With No Related Allowance Recorded | 1,818 |  | 1,818 |  | 2,930
With an Allowance Recorded |  |  |  |  |
Related Allowance |  |  |  |  |
Average Recorded Investment | 1,823 | 2,546 | 2,309 | 1,945 |
Interest Income Recognized | 18 | 19 | 44 | 48 |
Real estate loans [Member] | Land [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 1,612 |  | 1,612 |  | 2,097
Unpaid Principal Balance | 1,902 |  | 1,902 |  | 2,307
With No Related Allowance Recorded | 1,612 |  | 1,612 |  | 2,097
With an Allowance Recorded |  |  |  |  |
Related Allowance |  |  |  |  |
Average Recorded Investment | 1,637 | 2,137 | 1,674 | 2,175 |
Interest Income Recognized | 40 | 45 | 80 | 91 |
Real estate loans [Member] | Other [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 523 |  | 523 |  | 527
Unpaid Principal Balance | 523 |  | 523 |  | 527
With No Related Allowance Recorded |  |  |  |  |
With an Allowance Recorded | 523 |  | 523 |  | 527
Related Allowance | 28 |  | 28 |  | 67
Average Recorded Investment | 524 | 878 | 525 | 1,138 |
Interest Income Recognized | 6 | 11 | 10 | 33 |
Real estate loans [Member] | Residential property [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 3,019 |  | 3,019 |  | 3,265
Unpaid Principal Balance | 3,091 |  | 3,091 |  | 3,308
With No Related Allowance Recorded | 3,019 |  | 3,019 |  | 1,866
With an Allowance Recorded |  |  |  |  | 1,399
Related Allowance |  |  |  |  | 94
Average Recorded Investment | 3,027 | 3,177 | 3,043 | 3,259 |
Interest Income Recognized | 31 | 48 | 59 | 84 |
Real estate loans [Member] | Construction [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Average Recorded Investment |  | 7,983 |  | 8,090 |
Interest Income Recognized |  | 89 |  | 178 |
Commercial and industrial loans [Member] | Unsecured [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 12,689 |  | 12,689 |  | 14,532
Unpaid Principal Balance | 13,742 |  | 13,742 |  | 15,515
With No Related Allowance Recorded | 3,440 |  | 3,440 |  | 6,826
With an Allowance Recorded | 9,249 |  | 9,249 |  | 7,706
Related Allowance | 3,863 |  | 3,863 |  | 2,144
Average Recorded Investment | 12,933 | 13,474 | 13,093 | 14,257 |
Interest Income Recognized | 221 | 192 | 406 | 430 |
Commercial and industrial loans [Member] | Secured by real estate [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 16,492 |  | 16,492 |  | 22,050
Unpaid Principal Balance | 17,649 |  | 17,649 |  | 23,221
With No Related Allowance Recorded | 15,887 |  | 15,887 |  | 9,520
With an Allowance Recorded | 605 |  | 605 |  | 12,530
Related Allowance | 119 |  | 119 |  | 2,319
Average Recorded Investment | 16,539 | 19,021 | 17,026 | 22,756 |
Interest Income Recognized | 305 | 525 | 618 | 958 |
Commercial and industrial loans [Member] | Commercial lines of credit [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 1,052 |  | 1,052 |  | 1,521
Unpaid Principal Balance | 1,259 |  | 1,259 |  | 1,704
With No Related Allowance Recorded | 1,052 |  | 1,052 |  | 848
With an Allowance Recorded |  |  |  |  | 673
Related Allowance |  |  |  |  | 230
Average Recorded Investment | 1,060 | 1,788 | 1,286 | 1,835 |
Interest Income Recognized | 9 | 22 | 24 | 30 |
Commercial and industrial loans [Member] | SBA loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 5,541 |  | 5,541 |  | 6,170
Unpaid Principal Balance | 8,832 |  | 8,832 |  | 10,244
With No Related Allowance Recorded | 3,363 |  | 3,363 |  | 4,294
With an Allowance Recorded | 2,178 |  | 2,178 |  | 1,876
Related Allowance | 998 |  | 998 |  | 762
Average Recorded Investment | 5,595 | 8,336 | 6,034 | 8,150 |
Interest Income Recognized | 281 | 286 | 554 | 483 |
Commercial and industrial loans [Member] | International loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 1,281 |  | 1,281 |  |
Unpaid Principal Balance | 1,280 |  | 1,280 |  |
With No Related Allowance Recorded | 572 |  | 572 |  |
With an Allowance Recorded | 709 |  | 709 |  |
Related Allowance | 31 |  | 31 |  |
Average Recorded Investment | 1,330 |  | 1,414 |  |
Consumer loans [Member] | Consumer loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Recorded Investment | 1,647 |  | 1,647 |  | 1,652
Unpaid Principal Balance | 1,718 |  | 1,718 |  | 1,711
With No Related Allowance Recorded | 457 |  | 457 |  | 449
With an Allowance Recorded | 1,190 |  | 1,190 |  | 1,203
Related Allowance | 385 |  | 385 |  | 615
Average Recorded Investment | 1,649 | 1,402 | 1,646 | 903 |
Interest Income Recognized | $ 15 | $ 2 | $ 27 | $ 10 |

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