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Note 8 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Loans past due | $ 103,789 | $ 98,709
Non-accrual loans | 42,410 | 48,787
Loans not past due | 13,543,857 | 12,771,581
Loans | 13,647,646 | 12,870,290
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 28,212 | 38,396
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 26,486 | 11,526
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Loans past due | 6,681 |
Commercial Portfolio Segment [Member] |  |
Loans past due | 66,126 | 30,567
Non-accrual loans | 17,118 | 14,296
Loans not past due | 2,607,963 | 2,430,699
Loans | 2,674,089 | 2,461,266
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due | 28,212 | 11,079
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 17,329 | 5,192
Commercial Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Loans past due | 3,467 |
Real Estate Construction Portfolio Segment [Member] |  |
Loans past due | 4,922 | 11,213
Non-accrual loans | 4,922 | 8,185
Loans not past due | 592,096 | 667,592
Loans | 597,018 | 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 | 25,543 | 42,995
Non-accrual loans | 13,172 | 19,820
Loans not past due | 6,554,711 | 6,439,700
Loans | 6,580,254 | 6,482,695
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due |  | 17,573
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Loans past due | 9,157 | 5,602
Commercial Real Estate Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Loans past due | 3,214 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |
Loans past due | 7,198 | 13,831
Non-accrual loans | 7,198 | 6,486
Loans not past due | 3,783,512 | 3,228,523
Loans | 3,790,710 | 3,242,354
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Loans past due |  | 6,613
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 | 5,575 | 5,067
Loans | 5,575 | 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 |  |

X
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