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Note 3 - Investment Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Securities held to maturity: |  |
Securities held to maturity, due in one year or less, amortized cost | $ 3,220 |
Securities held to maturity, due in one year or less, fair value | 3,234 |
Securities held to maturity, due after one year through five years, amortized cost | 33,088 |
Securities held to maturity, due after one year through five years, fair value | 33,865 |
Securities held to maturity, due after five years, amortized cost | 364,338 |
Securities held to maturity, due after five years, fair value | 389,446 |
Securities held to maturity, amortized cost | 400,646 |
Securities held to maturity, fair value | 426,545 | $ 400,770
Securities available for sale: |  |
Securities available for sale, due in one year or less, amortized cost | 1,084 |
Securities available for sale, Due in one year or less, fair value | 1,084 |
Securities available for sale, due after one year through five years, amortized cost | 17,089 |
Securities available for sale, Due after one year through five years, fair value | 17,320 |
Securities available for sale, due after five years, amortized cost | 70,065 |
Securities available for sale, Due after five years, fair value | 71,704 |
Securities available for sale, single maturity, amortized cost | 88,238 |
Securities available for sale, single maturity, fair value | 90,108 |
Securities available for sale, amortized cost | 206,962 | 266,671
Securities available for sale, fair value | 210,695 | 261,056
Callable Securities [Member] |  |
Securities available for sale: |  |
Securities available for sale, amortized cost | 44,174 |
Securities available for sale, fair value | 45,628 |
US States and Political Subdivisions Debt Securities |  |
Securities held to maturity: |  |
Securities held to maturity, fair value | 425,495 | 399,721
Securities available for sale: |  |
Securities available for sale, amortized cost | 46,659 | 59,069
Securities available for sale, fair value | 48,257 | 58,546
US States and Political Subdivisions Debt Securities | Callable Securities [Member] |  |
Securities held to maturity: |  |
Securities held to maturity, callable, amortized cost | 182,653 |
Securities held to maturity, callable, fair value | 186,631 |
Securities available for sale: |  |
Securities available for sale, callable, amortized cost | 39,674 |
Securities available for sale, callable, fair value | 40,990 |
Residential mortgage-backed and related securities |  |
Securities available for sale: |  |
Securities available for sale, amortized cost | 118,724 | 163,698
Securities available for sale, fair value | 120,587 | 159,249
Securities available for sale, callable, amortized cost | 118,724 |
Securities available for sale, callable, fair value | 120,587 |
Other Securities |  |
Securities held to maturity: |  |
Securities held to maturity, fair value | 1,050 | 1,049
Securities available for sale: |  |
Securities available for sale, amortized cost | 21,707 | 6,754
Securities available for sale, fair value | 21,773 | $ 6,850
Securities available for sale, callable, amortized cost | 4,500 |
Securities available for sale, callable, fair value | $ 4,638 |

X
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