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Note 7 - Loans (Detail) - Allowance for Loan Losses by Portfolio Segment and Based on Impairment Method (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Loans individually evaluated for impairment |  |
Allowance individually evaluated for impairment | $ 17,357 | $ 12,183
Balance individually evaluated for impairment | 230,544 | 248,597
Loans collectively evaluated for impairment |  |
Allowance collectively evaluated for impairment | 161,335 | 171,139
Balance collectively evaluated for impairment | 7,133,796 | 7,180,550
Total allowance | 178,692 | 183,322
Total balance | 7,364,340 | 7,429,147
Commercial Portfolio Segment [Member] |  |
Loans individually evaluated for impairment |  |
Allowance individually evaluated for impairment | 1,717 | 1,467
Balance individually evaluated for impairment | 19,474 | 23,922
Loans collectively evaluated for impairment |  |
Allowance collectively evaluated for impairment | 59,339 | 64,634
Balance collectively evaluated for impairment | 2,012,315 | 2,103,185
Total allowance | 61,056 | 66,101
Total balance | 2,031,789 | 2,127,107
Real Estate Construction Loans [Member] |  |
Loans individually evaluated for impairment |  |
Allowance individually evaluated for impairment | 8,080 | 8,158
Balance individually evaluated for impairment | 42,071 | 42,133
Loans collectively evaluated for impairment |  |
Allowance collectively evaluated for impairment | 12,617 | 14,859
Balance collectively evaluated for impairment | 141,996 | 138,817
Total allowance | 20,697 | 23,017
Total balance | 184,067 | 180,950
Commercial Mortgage Loans [Member] |  |
Loans individually evaluated for impairment |  |
Allowance individually evaluated for impairment | 6,242 | 1,336
Balance individually evaluated for impairment | 150,750 | 165,885
Loans collectively evaluated for impairment |  |
Allowance collectively evaluated for impairment | 78,574 | 81,137
Balance collectively evaluated for impairment | 3,608,830 | 3,602,567
Total allowance | 84,816 | 82,473
Total balance | 3,759,580 | 3,768,452
Residential Mortgage And Equity Lines Member |  |
Loans individually evaluated for impairment |  |
Allowance individually evaluated for impairment | 1,318 | 1,222
Balance individually evaluated for impairment | 18,249 | 16,657
Loans collectively evaluated for impairment |  |
Allowance collectively evaluated for impairment | 10,773 | 10,481
Balance collectively evaluated for impairment | 1,356,673 | 1,323,425
Total allowance | 12,091 | 11,703
Total balance | 1,374,922 | 1,340,082
Consumer And Other Member |  |
Loans individually evaluated for impairment |  |
Allowance individually evaluated for impairment | 0 | 0
Balance individually evaluated for impairment | 0 | 0
Loans collectively evaluated for impairment |  |
Allowance collectively evaluated for impairment | 32 | 28
Balance collectively evaluated for impairment | 13,982 | 12,556
Total allowance | 32 | 28
Total balance | $ 13,982 | $ 12,556

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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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