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Note 8 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Loans past due | $ 93,423 | $ 106,057
Non-accrual loans | 47,200 | 41,815
Loans not past due | 14,635,131 | 13,889,731
Loans | 14,728,554 | 13,995,788
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans past due | 33,117 | 45,978
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans past due | 12,423 | 14,491
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans past due | 683 | 3,773
Commercial Portfolio Segment [Member] |  |
Loans past due | 61,611 | 47,267
Non-accrual loans | 22,970 | 18,805
Loans not past due | 2,606,450 | 2,694,698
Loans | 2,668,061 | 2,741,965
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans past due | 29,905 | 25,494
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans past due | 8,736 | 2,454
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans past due | 0 | 514
Real Estate Construction Portfolio Segment [Member] |  |
Loans past due | 4,629 | 8,028
Non-accrual loans | 4,629 | 4,872
Loans not past due | 589,187 | 573,426
Loans | 593,816 | 581,454
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans past due | 0 | 0
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans past due | 0 | 3,156
Real Estate Construction Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans past due | 0 | 0
Commercial Real Estate Portfolio Segment [Member] |  |
Loans past due | 19,626 | 33,212
Non-accrual loans | 12,330 | 10,611
Loans not past due | 7,115,973 | 6,690,988
Loans | 7,135,599 | 6,724,200
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans past due | 2,926 | 10,797
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans past due | 3,687 | 8,545
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans past due | 683 | 3,259
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans past due | 7,557 | 17,550
Non-accrual loans | 7,271 | 7,527
Loans not past due | 4,318,434 | 3,926,270
Loans | 4,325,991 | 3,943,820
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans past due | 286 | 9,687
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans past due | 0 | 336
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans past due | 0 | 0
Installment and Other Loans [Member ] |  |
Loans past due | 0 | 0
Non-accrual loans | 0 | 0
Loans not past due | 5,087 | 4,349
Loans | 5,087 | 4,349
Installment and Other Loans [Member ] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans past due | 0 | 0
Installment and Other Loans [Member ] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans past due | 0 | 0
Installment and Other Loans [Member ] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans past due | $ 0 | $ 0

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