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Note 3 - Investment Securities - Summary of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized Cost | $ 406,033 | $ 462,096
Gross Unrealized Gains | 6,493 | 5,137
Gross Unrealized Losses | (386) | (1,273)
Estimated Fair Value | 412,140 | 465,960
Amortized Cost | 1,333,815 | 1,181,484
Gross Unrealized Gains | 1,939 | 1,279
Gross Unrealized Losses | (18,334) | (25,409)
Estimated Fair Value | 1,317,420 | 1,157,354
US Government Agencies Debt Securities [Member] |  |
Amortized Cost | 66,928 | 76,875
Gross Unrealized Gains | 40 | 107
Gross Unrealized Losses | (140) | (182)
Estimated Fair Value | 66,828 | 76,800
Amortized Cost | 210,004 | 140,005
Gross Unrealized Gains | 273 | 67
Gross Unrealized Losses | (2,057) | (2,301)
Estimated Fair Value | 208,220 | 137,771
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Amortized Cost | 16,972 | 19,773
Gross Unrealized Gains | 56 | 63
Gross Unrealized Losses | (191) | (249)
Estimated Fair Value | 16,837 | 19,587
Amortized Cost | 973,111 | 885,783
Gross Unrealized Gains | 120 | 178
Gross Unrealized Losses | (13,533) | (17,637)
Estimated Fair Value | 959,698 | 868,324
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized Cost | 320,116 | 362,532
Gross Unrealized Gains | 6,397 | 4,967
Gross Unrealized Losses | (55) | (842)
Estimated Fair Value | 326,458 | 366,657
Amortized Cost | 87,405 | 108,374
Gross Unrealized Gains | 161 | 38
Gross Unrealized Losses | (2,744) | (5,469)
Estimated Fair Value | 84,822 | 102,943
Other Securities [Member] |  |
Amortized Cost | 2,017 | 2,916
Gross Unrealized Gains |  |
Gross Unrealized Losses |  |
Estimated Fair Value | 2,017 | 2,916
Amortized Cost | 63,295 | 47,022
Gross Unrealized Gains | 1,385 | 996
Gross Unrealized Losses |  | (2)
Estimated Fair Value | 64,680 | 48,016
US Treasury Securities [Member] |  |
Amortized Cost |  | 300
Gross Unrealized Gains |  |
Gross Unrealized Losses |  |
Estimated Fair Value |  | $ 300

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