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Note 8 - Loans (Details Textual) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
Impaired Financing Receivable, Recorded Investment, Total | $ 88,129 | $ 75,859 |
Percentage Of Charge Off To Contractual Balances For Impaired Loans | 0.30% | 2.10% |
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve | $ 86 |  | $ 37
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | 0 |  |
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend |  | $ 0 |
Loans and Leases Receivable, Gross, Total | 15,608,283 | 15,075,481 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Loans and Leases Receivable, Gross, Total | $ 7,391,502 | 7,275,262 |
Financing Receivable, Number of Contracts with Modifications | 723 |  |
Loans and Leases Receivable with Modifications, Gross | $ 1,500,000 |  |
Financing Receivable with Modifications, Percentage of Total Commercial Real Estate Loans | 21.00% |  |
Commercial Portfolio Segment [Member] |  |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve | $ 86 |  | $ 37
Loans and Leases Receivable, Gross, Total | $ 3,007,966 | 2,778,744 |
Financing Receivable, Number of Contracts with Modifications | 81 |  |
Loans and Leases Receivable with Modifications, Gross | $ 141,600 |  |
Financing Receivable, Percentage of Total Modified Commercial Loans | 4.70% |  |
Residential Portfolio Segment [Member] |  |  |
Loans and Leases Receivable, Gross, Total | $ 4,184,721 | 4,088,586 |
Financing Receivable, Number of Contracts with Approved Forbearance Requests | 1,198 |  |
Loans and Leases Receivable with Approved Forbearance Requests, Gross | $ 518,100 |  |
Financing Receivable, Approved Forbearance Percentage of Total Residential Mortgage Loans | 12.40% |  |
SBA's Paycheck Protection Program [Member] |  |  |
Financing Receivable, Number of Contracts | 1,381 |  |
Loans and Leases Receivable, Gross, Total | $ 261,700 |  |
Minimum [Member] |  |  |
Period Loan Is In Payment Default (Day) | 60 days |  |
Maximum [Member] |  |  |
Period Loan Is In Payment Default (Day) | 90 days |  |
Nonaccrual Loans [Member] |  |  |
Impaired Financing Receivable, Recorded Investment, Total | $ 56,400 | 40,500 |
Accruing Troubled Debt Restructuring [Member] |  |  |
Impaired Financing Receivable, Recorded Investment, Total | 31,700 | 35,400 |
Financing Receivable, Troubled Debt Restructuring | 31,700 | 35,300 |
Troubled Debt Restructuring, Specific Reserves | 432,000 |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve | 822 |  |
Non-accruing Troubled Debt Restructuring [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring | 12,700 | 18,000 |
Troubled Debt Restructuring, Specific Reserves | $ 53,000 |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve |  | $ 2,200 |

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