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Note 4 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Loans past due | $ 131,462 | $ 106,057
Non-accrual loans | 40,523 | 41,815
Loans not past due | 14,944,019 | 13,889,731
Loans | 15,075,481 | 13,995,788
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans past due | 64,249 | 45,978
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans past due | 20,281 | 14,491
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans past due | 6,409 | 3,773
Commercial Portfolio Segment [Member] |  |
Loans past due | 60,425 | 47,267
Non-accrual loans | 19,381 | 18,805
Loans not past due | 2,718,319 | 2,694,698
Loans | 2,778,744 | 2,741,965
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans past due | 24,681 | 25,494
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans past due | 9,954 | 2,454
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans past due | 6,409 | 514
Real Estate Construction Portfolio Segment [Member] |  |
Loans past due | 17,179 | 8,028
Non-accrual loans | 4,580 | 4,872
Loans not past due | 562,685 | 573,426
Loans | 579,864 | 581,454
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans past due | 5,846 | 0
Real Estate Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans past due | 6,753 | 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 | 20,231 | 33,212
Non-accrual loans | 9,928 | 10,611
Loans not past due | 7,255,031 | 6,690,988
Loans | 7,275,262 | 6,724,200
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans past due | 7,694 | 10,797
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans past due | 2,609 | 8,545
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans past due | 0 | 3,259
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans past due | 33,627 | 17,550
Non-accrual loans | 6,634 | 7,527
Loans not past due | 4,402,934 | 3,926,270
Loans | 4,436,561 | 3,943,820
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans past due | 26,028 | 9,687
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans past due | 965 | 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 | 5,050 | 4,349
Loans | 5,050 | 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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