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Note 5 - Loans (Detail) - Allowance for Loan Losses by Portfolio Segment (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Provision for possible credit losses | $ 10,668 | $ 10,385 | $ 20,139
Charge-offs | (32,791) | (77,626) | (138,755)
Recoveries | 18,127 | 11,407 | 12,327
Commercial Loans Member |  |  |
Beginning Balance | 65,658 | 63,918 |
Provision for possible credit losses | 16,201 | 11,711 |
Charge-offs | (17,707) | (11,745) |
Recoveries | 1,949 | 1,774 |
Net charge-offs | (15,758) | (9,971) |
Ending Balance | 66,101 | 65,658 |
Reserve for impaired loans | 1,467 | 3,336 |
Reserve for non-impaired loans | 64,634 | 62,322 |
Reserve for off-balance sheet credit commitments | 837 | 816 |
Real Estate Construction Loans [Member] |  |  |
Beginning Balance | 21,749 | 43,262 |
Provision for possible credit losses | (3,720) | 11,514 |
Charge-offs | (1,165) | (37,500) |
Recoveries | 6,153 | 4,473 |
Net charge-offs | 4,988 | (33,027) |
Ending Balance | 23,017 | 21,749 |
Reserve for impaired loans | 8,158 |  |
Reserve for non-impaired loans | 14,859 | 21,749 |
Reserve for off-balance sheet credit commitments | 390 | 1,103 |
Commercial Mortgage Loans [Member] |  |  |
Beginning Balance | 108,021 | 128,348 |
Provision for possible credit losses | (23,128) | 1,454 |
Charge-offs | (11,762) | (26,750) |
Recoveries | 9,342 | 4,969 |
Net charge-offs | (2,420) | (21,781) |
Ending Balance | 82,473 | 108,021 |
Reserve for impaired loans | 1,336 | 2,969 |
Reserve for non-impaired loans | 81,137 | 105,052 |
Reserve for off-balance sheet credit commitments | 98 | 113 |
Residential Mortgage And Equity Lines Member |  |  |
Beginning Balance | 10,795 | 9,668 |
Provision for possible credit losses | 2,360 | 2,392 |
Charge-offs | (2,132) | (1,456) |
Recoveries | 680 | 191 |
Net charge-offs | (1,452) | (1,265) |
Ending Balance | 11,703 | 10,795 |
Reserve for impaired loans | 1,222 | 1,247 |
Reserve for non-impaired loans | 10,481 | 9,548 |
Reserve for off-balance sheet credit commitments | 34 | 34 |
Installment And Other Loans Member |  |  |
Beginning Balance | 57 | 35 |
Provision for possible credit losses | (7) | 197 |
Charge-offs | (25) | (175) |
Recoveries | 3 |  |
Net charge-offs | (22) | (175) |
Ending Balance | 28 | 57 |
Reserve for impaired loans | 0 |  |
Reserve for non-impaired loans | 28 | 57 |
Reserve for off-balance sheet credit commitments | 3 | 3 |
Total [Member] |  |  |
Beginning Balance | 206,280 | 245,231 |
Provision for possible credit losses | (8,294) | 27,268 |
Charge-offs | (32,791) | (77,626) |
Recoveries | 18,127 | 11,407 |
Net charge-offs | (14,664) | (66,219) |
Ending Balance | 183,322 | 206,280 |
Reserve for impaired loans | 12,183 | 7,552 |
Reserve for non-impaired loans | 171,139 | 198,728 |
Reserve for off-balance sheet credit commitments | $ 1,362 | $ 2,069 |

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- Definition Financing Receivable, Allowance For Credit Losses, Net Charge-Offs + References No definition available. + Details
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- Definition Reserve For Off-Balance Sheet Credit Commitments + References No definition available. + Details
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- Definition Reserve To Impaired Loans + References No definition available. + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 168, 169, 170 -IssueDate 2006-05-01 -Chapter 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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