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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)