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Note 7 - Loans (Details) - Aging of Loan Portfolio - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans past due | $ 113,788 | $ 78,466
Non-accrual loans | 44,643 | 52,130
Loans not past due | 10,249,859 | 10,084,986
Loans | 10,363,647 | 10,163,452
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans past due | 60,081 | 22,854
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans past due | 9,064 | 3,482
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans past due | 45,894 | 12,133
Non-accrual loans | 2,645 | 3,545
Loans not past due | 2,205,293 | 2,304,730
Loans | 2,251,187 | 2,316,863
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans past due | 35,329 | 8,367
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans past due | 7,920 | 221
Real Estate Construction Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans past due | 7,708 | 23,591
Non-accrual loans | 6,179 | 16,306
Loans not past due | 445,761 | 417,952
Loans | 453,469 | 441,543
Real Estate Construction Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans past due | 1,529 | 7,285
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans past due | 46,817 | 29,697
Non-accrual loans | 28,537 | 25,231
Loans not past due | 5,398,758 | 5,271,521
Loans | 5,445,575 | 5,301,218
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans past due | 17,136 | 2,243
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans past due | 1,144 | 2,223
Residential Mortgage Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans past due | 13,369 | 13,045
Non-accrual loans | 7,282 | 7,048
Loans not past due | 2,198,703 | 2,088,290
Loans | 2,212,072 | 2,101,335
Residential Mortgage Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans past due | 6,087 | 4,959
Residential Mortgage Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans past due |  | 1,038
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans not past due | 1,344 | 2,493
Loans | $ 1,344 | $ 2,493

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- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524 + 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=65884687&loc=d3e4428-111522 + Details
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