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Note 5 - Loans (Details Textual) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 | Jun. 30, 2018 USD ($) | Jun. 30, 2017 | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Fair Value of Collateral Dependent Loans as a Percentage of Appraised or Estimated Value of Collateral |  |  | 85.00% |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | $ 5,318,160,000 |  | $ 5,318,160,000 |  |  | $ 5,160,236,000
Allowance for Loan and Lease Losses, Loss Emergence Period |  |  | 1 year 120 days |  |  |
Loans and Leases Receivable, Impaired, Commitment to Lend | $ 0 |  | $ 0 |  |  |
Financing Receivable, Modifications, Number of Contracts | 0 |  | 0 | 5 |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts |  |  | 0 |  |  |
TDR Loans Transferred to Non-performing, Number of Contracts | 0 | 0 |  | 0 |  |
Extension of Credit [Member] |  |  |  |  |  |
Commitments and Contingencies | $ 25,200,000 |  | $ 25,200,000 |  |  |
Extension of Lines of Credit [Member] |  |  |  |  |  |
Commitments and Contingencies | 300,800,000 |  | 300,800,000 |  |  |
Taxi Medallion Portfolio Segment [Member] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | $ 6,225,000 |  | $ 6,225,000 |  |  | 6,834,000
Percent of Loan Portfolio to Total Loans | 0.12% |  | 0.12% |  |  |
Number of Assets Foreclosed on During the Period |  |  | 1 |  |  |
Taxi Medallion Portfolio Segment [Member] | Other Assets [Member] |  |  |  |  |  |
Other Repossessed Assets | $ 35,000,000,000 |  | $ 35,000,000,000 |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Allowance for Loan and Lease Losses, Loss Emergence Period |  |  | 1 year 120 days |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Allowance for Loan and Lease Losses, Loss Emergence Period |  |  | 1 year 211 days |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Loans and Leases Receivable, Net of Deferred Income, Total | 1,471,894,000 |  | $ 1,471,894,000 |  |  | $ 1,368,112,000
Number of Real Estate Classified as Troubled Debt Restructuring Sold |  |  | 1 |  |  |
Financing Receivable, Modification, Sold During Period |  |  | $ 1,800,000 |  |  |
Loss on Sale of Real Estate Classified as Troubled Debt Restructuring |  |  | 300,000 |  |  |
Chicago Taxi Medallion [Member] | Taxi Medallion Portfolio Segment [Member] |  |  |  |  |  |
Fair Value Per Taxi Medallion | 25,000 |  | 25,000 |  | $ 60,000 |
Loans and Leases Receivable, Net of Deferred Income, Total | $ 200,000 |  | $ 200,000 |  |  |

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