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Note 26 - Parent Company Financial Information (Details) - Condensed Statements of Cash Flows - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 14, 2011 | 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, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Cash Flows From Operating Activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  | $ 22,348,000 | $ 21,463,000 | $ 20,938,000 | $ 19,418,000 | $ 14,727,000 | $ 14,088,000 | $ 12,944,000 | $ 12,499,000 | $ 12,003,000 | $ 11,757,000 | $ 11,675,000 | $ 11,572,000 | $ 84,167,000 | $ 54,258,000 | $ 47,007,000
Adjustments to reconcile net income to net cash (used in) provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess tax benefit on stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,984,000) | (978,000) | (410,000)
Proceeds from sale of available for sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  | 111,700,000 | 49,900,000 | 22,100,000
(Increase) decrease in other assets |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,725,000) | (12,631,000) | (26,000)
(Decrease) increase in other liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,315,000 | 1,856,000 | 10,850,000
Net cash (used in) operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  | 98,589,000 | 59,508,000 | 258,677,000
Cash Flows From Investing Activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | (796,921,000) | (725,726,000) | (600,736,000)
Cash Flows From Financing Activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 94,633,000 | 144,093,000 |
Issuance of Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,300,000 |
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,176,000 | 2,313,000 | 1,984,000
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  |  | (600,000) | (614,000) | (566,000)
Excess tax benefit on stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,984,000 | 978,000 | 410,000
Payment in lieu of fractional shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000 |  | 11,000
Proceeds from employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  | 769,000 | 621,000 | 543,000
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | 740,670,000 | 615,283,000 | 309,685,000
Net Increase in Cash |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,338,000 | (50,935,000) | (32,374,000)
Cash and Cash Equivalents at Beginning of Year |  |  |  |  | 256,025,000 |  |  |  | 306,960,000 |  |  |  | 339,334,000 | 256,025,000 | 306,960,000 | 339,334,000
Cash and Cash Equivalents at End of Year |  | 298,363,000 |  |  |  | 256,025,000 |  |  |  | 306,960,000 |  |  |  | 298,363,000 | 256,025,000 | 306,960,000
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flows From Financing Activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  | (15,300,000) |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flows From Financing Activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Series C Preferred Stock | $ 56,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  | (56,600,000) |  |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flows From Operating Activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  |  |  |  |  |  | 84,167,000 | 54,258,000 | 47,007,000
Adjustments to reconcile net income to net cash (used in) provided by operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed income of subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  | (87,557,000) | (56,545,000) | (48,252,000)
Excess tax benefit on stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,984,000) | (978,000) | (410,000)
Proceeds from sale of available for sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  | 84,000 |  |
(Increase) decrease in other assets |  |  |  |  |  |  |  |  |  |  |  |  |  | (785,000) | (1,731,000) | 353,000
(Decrease) increase in other liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | (121,000) | 1,803,000 | 67,000
Net cash (used in) operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,196,000) | (3,193,000) | (1,235,000)
Cash Flows From Investing Activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in subsidiary (net) |  |  |  |  |  |  |  |  |  |  |  |  |  | (419,000) | (203,782,000) | (810,000)
Net cash used in investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | (419,000) | (203,782,000) | (810,000)
Cash Flows From Financing Activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 94,633,000 | 144,093,000 |
Increase in long-term borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70,000,000 |
Decrease in long-term borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,300,000) |  |
Proceeds from exercise of stock options |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,176,000 | 2,313,000 | 1,984,000
Preferred stock dividends |  |  |  |  |  |  |  |  |  |  |  |  |  | (600,000) | (614,000) | (566,000)
Excess tax benefit on stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,984,000 | 978,000 | 410,000
Payment in lieu of fractional shares |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,000) |  | (11,000)
Proceeds from employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  | 769,000 | 621,000 | 543,000
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,758,000 | 232,691,000 | 2,360,000
Net Increase in Cash |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,143,000 | 25,716,000 | 315,000
Cash and Cash Equivalents at Beginning of Year |  |  |  |  | $ 51,549,000 |  |  |  | $ 25,833,000 |  |  |  | $ 25,518,000 | 51,549,000 | 25,833,000 | 25,518,000
Cash and Cash Equivalents at End of Year |  | $ 65,692,000 |  |  |  | $ 51,549,000 |  |  |  | $ 25,833,000 |  |  |  | 65,692,000 | 51,549,000 | $ 25,833,000
Parent Company [Member] | Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flows From Financing Activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,300,000 |
Redemption of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  | (15,300,000) |  |
Parent Company [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Flows From Financing Activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (56,600,000) |  |

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- Definition The cash outflow for reacquisition of callable preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 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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