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Note 26 - Parent Company Financial Information - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash Flows From Operating Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 25,717 | $ 24,523 | $ 24,145 | $ 23,322 | $ 22,348 | $ 21,463 | $ 20,938 | $ 19,418 | $ 14,727 | $ 14,088 | $ 12,944 | $ 12,499 | $ 97,707 | $ 84,167 | $ 54,258
Proceeds from sale of available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  | 94,300 | 111,700 | 49,900
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefits realized from stock compensation |  |  |  |  |  |  |  |  |  |  |  |  | (400) | (2,984) | (978)
Increase in other assets |  |  |  |  |  |  |  |  |  |  |  |  | (5,025) | (3,725) | (12,631)
Increase in other liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 8,545 | 1,315 | 1,856
Cash Flows From Financing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 94,633 | 144,093
Issuance of Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,300
Proceeds from exercise of equity compensation plans |  |  |  |  |  |  |  |  |  |  |  |  | 955 | 5,176 | 2,313
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  |  | 600 | 614
Excess tax benefit on stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  | 400 | 2,984 | 978
Payment in lieu of fractional shares |  |  |  |  |  |  |  |  |  |  |  |  |  | (4) |
Proceeds from employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  | 801 | 769 | 621
Net Increase in Cash |  |  |  |  |  |  |  |  |  |  |  |  | 69,800 | 42,338 | (50,935)
Cash and Cash Equivalents at Beginning of Period |  |  |  | 298,363 |  |  |  | 256,025 |  |  |  | 306,960 | 298,363 | 256,025 | 306,960
Cash and Cash Equivalents at End of Period | 368,163 |  |  |  | 298,363 |  |  |  | 256,025 |  |  |  | 368,163 | 298,363 | 256,025
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flows From Financing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  | (56,600) |
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flows From Financing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  | (15,300) |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flows From Operating Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  |  |  |  |  | 97,707 | 84,167 | 54,258
Proceeds from sale of available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  | 135 | 84 |
Investment in subsidiary (net) |  |  |  |  |  |  |  |  |  |  |  |  | (124,636) | (419) | (203,782)
Net cash used in investing activities |  |  |  |  |  |  |  |  |  |  |  |  | (124,501) | (335) | (203,782)
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed income of subsidiary |  |  |  |  |  |  |  |  |  |  |  |  | (103,374) | (87,557) | (56,545)
Tax benefits realized from stock compensation |  |  |  |  |  |  |  |  |  |  |  |  | (400) | (2,984) | (978)
Increase in other assets |  |  |  |  |  |  |  |  |  |  |  |  | (1,491) | (785) | (1,731)
Increase in other liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 3,186 | (121) | 1,803
Net cash (used in) operating activities |  |  |  |  |  |  |  |  |  |  |  |  | (4,372) | (7,280) | (3,193)
Cash Flows From Financing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 94,633 | 144,093
Issuance of Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,300
Issuance in long-term borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 147,586 |  | 70,000
Decrease in long-term borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,300) |
Proceeds from exercise of equity compensation plans |  |  |  |  |  |  |  |  |  |  |  |  | 955 | 5,176 | 2,313
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  |  | (600) | (614)
Excess tax benefit on stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  | 400 | 2,984 | 978
Payment in lieu of fractional shares |  |  |  |  |  |  |  |  |  |  |  |  |  | (4) |
Proceeds from employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  | 801 | 769 | 621
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  |  |  |  | 149,742 | 21,758 | 232,691
Net Increase in Cash |  |  |  |  |  |  |  |  |  |  |  |  | 20,869 | 14,143 | 25,716
Cash and Cash Equivalents at Beginning of Period |  |  |  | $ 65,692 |  |  |  | $ 51,549 |  |  |  | $ 25,833 | 65,692 | 51,549 | 25,833
Cash and Cash Equivalents at End of Period | $ 86,561 |  |  |  | $ 65,692 |  |  |  | $ 51,549 |  |  |  | 86,561 | 65,692 | 51,549
Parent Company [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flows From Financing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  | (56,600) |
Parent Company [Member] | Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flows From Financing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (15,300) |

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- Definition Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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