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Note 3 - Investment Securities - Summary of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Amortized Cost | $ 462,096 | $ 705,373
Gross Unrealized Gains | 5,137 | 9,806
Gross Unrealized Losses | (1,273) | (1,808)
Held-to-maturity securities | 465,960 | 713,371
Amortized Cost | 1,181,484 | 824,992
Gross Unrealized Gains | 1,279 | 1,587
Gross Unrealized Losses | (25,409) | (5,172)
Available-for-sale securities | 1,157,354 | 821,407
US Government Agencies Debt Securities [Member] |  |
Amortized Cost | 76,875 | 237,139
Gross Unrealized Gains | 107 | 582
Gross Unrealized Losses | (182) | (1,395)
Held-to-maturity securities | 76,800 | 236,326
Amortized Cost | 140,005 | 121,017
Gross Unrealized Gains | 67 | 118
Gross Unrealized Losses | (2,301) | (898)
Available-for-sale securities | 137,771 | 120,237
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Amortized Cost | 19,773 | 24,774
Gross Unrealized Gains | 63 | 86
Gross Unrealized Losses | (249) | (290)
Held-to-maturity securities | 19,587 | 24,570
Amortized Cost | 885,783 | 650,619
Gross Unrealized Gains | 178 | 937
Gross Unrealized Losses | (17,637) | (4,130)
Available-for-sale securities | 868,324 | 647,426
US States and Political Subdivisions Debt Securities [Member] |  |
Amortized Cost | 362,532 | 440,676
Gross Unrealized Gains | 4,967 | 9,138
Gross Unrealized Losses | (842) | (123)
Held-to-maturity securities | 366,657 | 449,691
Amortized Cost | 108,374 | 9,762
Gross Unrealized Gains | 38 | 112
Gross Unrealized Losses | (5,469) |
Available-for-sale securities | 102,943 | 9,874
Other Securities [Member] |  |
Amortized Cost | 2,916 | 2,784
Gross Unrealized Gains |  |
Gross Unrealized Losses |  |
Held-to-maturity securities | 2,916 | 2,784
Amortized Cost | 47,022 | 39,594
Gross Unrealized Gains | 996 | 420
Gross Unrealized Losses | (2) | (138)
Available-for-sale securities | 48,016 | 39,876
US Treasury Securities [Member] |  |
Amortized Cost | 300 | 4,000
Gross Unrealized Gains |  |
Gross Unrealized Losses |  | (6)
Available-for-sale securities | $ 300 | $ 3,994

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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