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Note 22 - Parent Company Financial Information - Condensed Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities                      
Net income                 $ 21,485 $ 25,126 $ 24,540
Adjustments to reconcile net income to net cash provided by operating activities                      
Loss (gain) on sale of securities $ 4 $ 657 $ (388) $ (25) $ 79 $ (1) 661 (335) (144)
Decrease in other operating activities                 9,209 6,957 18,842
Net cash provided by operating activities                 39,009 43,088 58,519
Investing activities                      
Proceeds from sale of securities available for sale                 13,664 104,928 10,999
Net cash provided by investing activities                 65,157 110,210 (70,785)
Financing activities                      
Redemption of preferred stock                 (2,367)
Payments for repurchase of treasury stock                 (1,263) (23,762) (21,525)
Payments of common dividends                 (11,563) (10,396) (9,994)
Payments of preferred dividends                 (219)
Net cash used in financing activities                 (22,522) (128,778) (173,607)
Net (decrease) increase in cash and cash equivalents                 81,644 24,520 (185,873)
Cash and cash equivalents at beginning of period       76,307       51,787 76,307 51,787 237,660
Cash and cash equivalents at end of period 157,951       76,307       157,951 76,307 51,787
Parent Company [Member]                      
Operating activities                      
Net income                 21,485 25,126 24,540
Adjustments to reconcile net income to net cash provided by operating activities                      
Equity in undistributed net income of subsidiaries                 (1,995)
Loss (gain) on sale of securities                 (65) (38)
Decrease in other operating activities                 656 397 (626)
Net cash provided by operating activities                 22,141 25,458 21,881
Investing activities                      
Proceeds from sale of securities available for sale                 8,660 199
Proceeds from divestitures                 4,900
Return of capital from subsidiaries                 3,654
Dividends in excess of undistributed net income of subsidiaries                 221 4,943
Net change in other investing activities                 (98)
Net cash provided by investing activities                 221 22,059 199
Financing activities                      
Repayments of other debt                 (2,000)
Repayments of long-term debt                 (15,464)
Redemption of preferred stock                 (2,367)
Proceeds from issuance of common stock                 738 1,243 264
Payments for repurchase of treasury stock                 (1,263) (23,762) (21,525)
Payments of common dividends                 (11,563) (10,396) (9,994)
Payments of preferred dividends                 (219)
Net change in other financing activities                 845 592 482
Net cash used in financing activities                 (26,707) (32,323) (35,359)
Net (decrease) increase in cash and cash equivalents                 (4,345) 15,194 (13,279)
Cash and cash equivalents at beginning of period       $ 23,561       $ 8,367 23,561 8,367 21,646
Cash and cash equivalents at end of period $ 19,216       $ 23,561       $ 19,216 $ 23,561 $ 8,367