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Note 5 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Loans past due | $ 98,709 | $ 126,826
Non-accrual loans | 48,787 | 49,682
Loans not past due | 12,771,581 | 11,074,449
Loans | 12,870,290 | 11,201,275
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 38,396 | 43,419
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 11,526 | 33,725
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Loans past due |  |
Commercial Portfolio Segment [Member] |  |
Loans past due | 30,567 | 65,653
Non-accrual loans | 14,296 | 15,710
Loans not past due | 2,430,699 | 2,182,534
Loans | 2,461,266 | 2,248,187
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 11,079 | 22,753
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 5,192 | 27,190
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 | 11,213 | 21,683
Non-accrual loans | 8,185 | 5,458
Loans not past due | 667,592 | 526,405
Loans | 678,805 | 548,088
Real Estate Construction Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 3,028 | 10,390
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 | 42,995 | 26,664
Non-accrual loans | 19,820 | 20,078
Loans not past due | 6,439,700 | 5,758,584
Loans | 6,482,695 | 5,785,248
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 17,573 | 5,886
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 5,602 | 700
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 | 13,831 | 12,826
Non-accrual loans | 6,486 | 8,436
Loans not past due | 3,228,523 | 2,602,933
Loans | 3,242,354 | 2,615,759
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 6,613 | 4,390
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 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 | 5,067 | 3,993
Loans | 5,170 | 3,993
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 Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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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://www.xbrl.org/2003/role/presentationRef -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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