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Note 8 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Loans past due | $ 113,921 | $ 98,709
Non-accrual loans | 52,728 | 48,787
Loans not past due | 13,234,816 | 12,771,581
Loans | 13,348,737 | 12,870,290
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 10,801 | 38,396
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 50,392 | 11,526
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Loans past due |  |
Commercial Portfolio Segment [Member] |  |
Loans past due | 63,249 | 30,567
Non-accrual loans | 19,212 | 14,296
Loans not past due | 2,513,400 | 2,430,699
Loans | 2,576,649 | 2,461,266
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 9,537 | 11,079
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 34,500 | 5,192
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 | 8,040 | 11,213
Non-accrual loans | 8,040 | 8,185
Loans not past due | 573,877 | 667,592
Loans | 581,917 | 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 |  |
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 | 32,345 | 42,995
Non-accrual loans | 17,154 | 19,820
Loans not past due | 6,583,446 | 6,439,700
Loans | 6,615,791 | 6,482,695
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 841 | 17,573
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 14,350 | 5,602
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 | 10,287 | 13,831
Non-accrual loans | 8,322 | 6,486
Loans not past due | 3,560,033 | 3,228,523
Loans | 3,570,320 | 3,242,354
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 423 | 6,613
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 1,542 | 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 | 4,060 | 5,067
Loans | 4,060 | 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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