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v3.19.1

Note 3 - Investment Securities (Details) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) | Dec. 31, 2018 USD ($) state security item | Dec. 31, 2017 USD ($) item
Number of securities | security |  | 611 |
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions | security |  | 350 |
Aggregate losses of securities (as a percent) |  | 1.90% |
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | security |  | 188 |
Cost of investment | $ | $ 0.0 |  |
Gain on sale | $ | $ 4.0 |  |
Security Owned and Pledged as Collateral, Fair Value | $ |  | $ 100.9 | $ 78.6
Number of states holding investments | state |  | 50 |
Number Of Charters Owning Municipal Securities | item |  | 5 |
Municipal Bonds | General Obligation Bonds |  |  |
Number of issuers | item |  | 110 | 131
Other investments | $ |  | $ 86.4 | $ 108.0
Number of states holding investments | item |  | 26 | 26
Municipal Bonds | General Obligation Bonds | Minimum |  |  |
Other investments | $ |  | $ 5.0 | $ 5.0
Municipal Bonds | General Obligation Bonds | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |
Number of states holding investments | item |  | 6 | 6
Municipal Bonds | Revenue Bonds |  |  |
Number of issuers | item |  | 160 | 145
Other investments | $ |  | $ 371.9 | $ 337.3
Number of states holding investments | item |  | 19 | 16
Municipal Bonds | Revenue Bonds | Minimum |  |  |
Other investments | $ |  | $ 5.0 | $ 5.0
Municipal Bonds | Revenue Bonds | Aggregate Fair Value Exceeding 5 Million [Member] |  |  |
Number of states holding investments | item |  | 7 | 7

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