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Note 5 - Loans (Details) - Aging of Loan Portfolio - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Type of Loans: |  |
Loans past due | $ 78,466 | $ 112,401
Non-accrual loans | 52,130 | 70,163
Loans not past due | 10,084,986 | 8,801,679
Loans | 10,163,452 | 8,914,080
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Type of Loans: |  |
Loans past due | 22,854 | 36,359
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Type of Loans: |  |
Loans past due | 3,482 | 5,879
Commercial Portfolio Segment [Member] |  |
Type of Loans: |  |
Loans past due | 12,133 | 19,816
Non-accrual loans | 3,545 | 6,983
Loans not past due | 2,304,730 | 2,362,677
Loans | 2,316,863 | 2,382,493
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Type of Loans: |  |
Loans past due | 8,367 | 11,595
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Type of Loans: |  |
Loans past due | 221 | 1,238
Real Estate Construction Portfolio Segment [Member] |  |
Type of Loans: |  |
Loans past due | 23,591 | 21,379
Non-accrual loans | 16,306 | 19,963
Loans not past due | 417,952 | 277,275
Loans | 441,543 | 298,654
Real Estate Construction Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Type of Loans: |  |
Loans past due | 7,285 | 1,416
Commercial Real Estate Portfolio Segment [Member] |  |
Type of Loans: |  |
Loans past due | 29,697 | 57,169
Non-accrual loans | 25,231 | 35,606
Loans not past due | 5,271,521 | 4,429,274
Loans | 5,301,218 | 4,486,443
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Type of Loans: |  |
Loans past due | 2,243 | 17,654
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Type of Loans: |  |
Loans past due | 2,223 | 3,909
Residential Mortgage Loans [Member] |  |
Type of Loans: |  |
Loans past due | 13,045 | 13,977
Non-accrual loans | 7,048 | 7,611
Loans not past due | 2,088,290 | 1,728,961
Loans | 2,101,335 | 1,742,938
Residential Mortgage Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Type of Loans: |  |
Loans past due | 4,959 | 5,634
Residential Mortgage Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Type of Loans: |  |
Loans past due | 1,038 | 732
Consumer Portfolio Segment [Member] |  |
Type of Loans: |  |
Loans past due |  | 60
Loans not past due | 2,493 | 3,492
Loans | $ 2,493 | 3,552
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Type of Loans: |  |
Loans past due |  | $ 60

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