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Note 5 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Loans past due | $ 106,057 | $ 98,709
Non-accrual loans | 41,815 | 48,787
Loans not past due | 13,889,731 | 12,771,581
Loans | 13,995,788 | 12,870,290
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 45,978 | 38,396
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 14,491 | 11,526
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Loans past due | 3,773 |
Commercial Portfolio Segment [Member] |  |
Loans past due | 47,267 | 30,567
Non-accrual loans | 18,805 | 14,296
Loans not past due | 2,694,698 | 2,430,699
Loans | 2,741,965 | 2,461,266
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 25,494 | 11,079
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 2,454 | 5,192
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Loans past due | 514 |
Real Estate Construction Portfolio Segment [Member] |  |
Loans past due | 8,028 | 11,213
Non-accrual loans | 4,872 | 8,185
Loans not past due | 573,426 | 667,592
Loans | 581,454 | 678,805
Real Estate Construction Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due |  | 3,028
Real Estate Construction Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 3,156 |
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 | 33,212 | 42,995
Non-accrual loans | 10,611 | 19,820
Loans not past due | 6,690,988 | 6,439,700
Loans | 6,724,200 | 6,482,695
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 10,797 | 17,573
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 8,545 | 5,602
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Loans past due | 3,259 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans past due | 17,550 | 13,831
Non-accrual loans | 7,527 | 6,486
Loans not past due | 3,926,270 | 3,228,523
Loans | 3,943,820 | 3,242,354
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 9,687 | 6,613
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 336 | 732
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Loans past due |  |
Installment and Other Loans [Member ] |  |
Loans past due |  | 103
Non-accrual loans |  |
Loans not past due | 4,349 | 5,067
Loans | 4,349 | 5,170
Installment and Other Loans [Member ] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due |  | 103
Installment and Other Loans [Member ] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due |  |
Installment and Other Loans [Member ] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Loans past due |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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