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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)