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Note 5 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Loans past due | $ 126,826 | $ 78,466
Non-accrual loans | 49,682 | 52,130
Loans not past due | 11,074,449 | 10,084,986
Loans | 11,201,275 | 10,163,452
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 43,419 | 22,854
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 33,725 | 3,482
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Loans past due |  |
Commercial Portfolio Segment [Member] |  |
Loans past due | 65,653 | 12,133
Non-accrual loans | 15,710 | 3,545
Loans not past due | 2,182,534 | 2,304,730
Loans | 2,248,187 | 2,316,863
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 22,753 | 8,367
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 27,190 | 221
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Loans past due |  |
Real Estate Construction Portfolio Segment [Member] |  |
Loans past due | 21,683 | 23,591
Non-accrual loans | 5,458 | 16,306
Loans not past due | 526,405 | 417,952
Loans | 548,088 | 441,543
Real Estate Construction Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 10,390 | 7,285
Real Estate Construction Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 5,835 |
Real Estate Construction Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Loans past due |  |
Commercial Real Estate Portfolio Segment [Member] |  |
Loans past due | 26,664 | 29,697
Non-accrual loans | 20,078 | 25,231
Loans not past due | 5,758,584 | 5,271,521
Loans | 5,785,248 | 5,301,218
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 5,886 | 2,243
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 700 | 2,223
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Loans past due |  |
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans past due | 12,826 | 13,045
Non-accrual loans | 8,436 | 7,048
Loans not past due | 2,602,933 | 2,088,290
Loans | 2,615,759 | 2,101,335
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 4,390 | 4,959
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due |  | 1,038
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Loans past due |  |
Consumer Portfolio Segment [Member] |  |
Loans past due |  |
Non-accrual loans |  |
Loans not past due | 3,993 | 2,493
Loans | 3,993 | 2,493
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due |  |
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due |  |
Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Loans past due |  |

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