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Note 5 - Loans (Detail) - Allowance for Loan Losses by Portfolio Segment and Based on Impairment Method (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Loans individually evaluated for impairment |  |
Allowance individually evaluated for impairment | $ 12,183 | $ 198,728
Balance individually evaluated for impairment | 248,597 | 6,737,239
Loans collectively evaluated for impairment |  |
Allowance collectively evaluated for impairment | 171,139 | 7,552
Balance collectively evaluated for impairment | 7,180,550 | 321,973
Total allowance | 183,322 | 206,280
Total balance | 7,429,147 | 7,059,212
Commercial Portfolio Segment [Member] |  |
Loans individually evaluated for impairment |  |
Allowance individually evaluated for impairment | 1,467 | 62,322
Balance individually evaluated for impairment | 23,922 | 1,822,494
Loans collectively evaluated for impairment |  |
Allowance collectively evaluated for impairment | 64,634 | 3,336
Balance collectively evaluated for impairment | 2,103,185 | 45,781
Total allowance | 66,101 | 65,658
Total balance | 2,127,107 | 1,868,275
Real Estate Construction Loans [Member] |  |
Loans individually evaluated for impairment |  |
Allowance individually evaluated for impairment | 8,158 | 21,749
Balance individually evaluated for impairment | 42,133 | 158,606
Loans collectively evaluated for impairment |  |
Allowance collectively evaluated for impairment | 14,859 | 0
Balance collectively evaluated for impairment | 138,817 | 78,766
Total allowance | 23,017 | 21,749
Total balance | 180,950 | 237,372
Commercial Mortgage Loans [Member] |  |
Loans individually evaluated for impairment |  |
Allowance individually evaluated for impairment | 1,336 | 105,052
Balance individually evaluated for impairment | 165,885 | 3,571,839
Loans collectively evaluated for impairment |  |
Allowance collectively evaluated for impairment | 81,137 | 2,969
Balance collectively evaluated for impairment | 3,602,567 | 177,058
Total allowance | 82,473 | 108,021
Total balance | 3,768,452 | 3,748,897
Residential Mortgage And Equity Lines Member |  |
Loans individually evaluated for impairment |  |
Allowance individually evaluated for impairment | 1,222 | 9,548
Balance individually evaluated for impairment | 16,657 | 1,166,601
Loans collectively evaluated for impairment |  |
Allowance collectively evaluated for impairment | 10,481 | 1,247
Balance collectively evaluated for impairment | 1,323,425 | 20,368
Total allowance | 11,703 | 10,795
Total balance | 1,340,082 | 1,186,969
Consumer And Other Member |  |
Loans individually evaluated for impairment |  |
Allowance individually evaluated for impairment | 0 | 57
Balance individually evaluated for impairment | 0 | 17,699
Loans collectively evaluated for impairment |  |
Allowance collectively evaluated for impairment | 28 | 0
Balance collectively evaluated for impairment | 12,556 | 0
Total allowance | 28 | 57
Total balance | $ 12,556 | $ 17,699

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + 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 (h) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + 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 (h) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 8, 9 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph a(ii) -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -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. + Details
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