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Note 22 - Condensed Financial Information (Parent Company Only) - Condensed Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 598,042 | $ 285,659 |  |
Investment securities | 1,957,575 | 1,619,450 |  |
Loans | 10,738,017 | 5,596,604 |  |
Premises and equipment | 287,249 | 199,359 |  |
Other assets | 71,439 | 65,773 |  |
TOTAL ASSETS | 15,055,806 | 8,400,056 |  |
LIABILITIES |  |  |  |
Long-term debt | 218,587 |  |  |
Total liabilities | 12,971,242 | 7,248,945 |  |
Stockholders’ equity: |  |  |  |
Common stock | 920 | 626 |  |
Surplus | 1,586,034 | 711,663 |  |
Undivided profits | 514,874 | 454,034 |  |
Total stockholders’ equity | 2,084,564 | 1,151,111 | $ 1,076,855 | $ 494,319
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY | 15,055,806 | 8,400,056 |  |
Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 19,101 | 93,266 |  |
Investment securities | 2,789 | 79 |  |
Investments in wholly-owned subsidiaries | 2,288,687 | 1,141,294 |  |
Loans | 993 | 1,083 |  |
Intangible assets, net | 133 | 133 |  |
Premises and equipment | 10,369 | 11,534 |  |
Other assets | 31,181 | 27,955 |  |
TOTAL ASSETS | 2,353,253 | 1,275,344 |  |
LIABILITIES |  |  |  |
Short-term debt | 75,000 |  |  |
Long-term debt | 183,947 | 108,326 |  |
Other liabilities | 9,742 | 15,907 |  |
Total liabilities | 268,689 | 124,233 |  |
Stockholders’ equity: |  |  |  |
Common stock | 920 | 626 |  |
Surplus | 1,586,034 | 711,663 |  |
Undivided profits | 514,874 | 454,034 |  |
Unrealized depreciation on available-for-sale securities, net of income taxes of ($6,108) and ($9,818) at December 31, 2017 and 2016 respectively | (17,264) | (15,212) |  |
Total stockholders’ equity | 2,084,564 | 1,151,111 |  |
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY | $ 2,353,253 | $ 1,275,344 |  |

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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity and (2) securities available-for-sale; but excluding (3) trading securities. + References No definition available. + Details
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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The sum of cash and cash equivalents plus Federal Funds Sold. Cash and cash equivalents consist of short term, highly liquid investments that are readily convertible to known amounts of cash and are so near their maturity that they present negligible risk of changes in value due to changes in interest rates -- usually with an original maturity less than 90 days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.1,2,3) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19-26) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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