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Note 22 - Parent Company Only Financial Information (Details) - Condensed Statements of Cash Flows for the Holding Company: - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
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, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating activities:                      
Net income $ 11,634 $ 11,008 $ 14,834 $ 8,733 $ 11,057 $ 11,201 $ 11,685 $ 10,296 $ 46,209 $ 44,239 $ 37,752
Adjustments to reconcile net income to net cash provided by operating activities:                      
Net gain on sale of securities                 (167) (2,875) (3,021)
Deferred income tax (benefit) provision                 (5,210) 4,154 (682)
Fair value adjustments for financial assets and financial liabilities                 1,841 2,568 2,521
Stock based compensation expense                 4,845 4,263 3,412
Net cash provided by operating activities                 44,730 57,376 74,435
Investing activities:                      
Purchases of securities available for sale                 (313,822) (162,830) (458,596)
Proceeds from sales and calls of securities available for sale                 163,158 115,294 194,009
Net cash provided by investing activities                 (600,516) (339,576) (326,024)
Financing activities:                      
Purchase of treasury stock                 (15,605) (18,872) (14,151)
Cash dividends paid                 (18,616) (17,852) (15,618)
Stock options exercised                 145 565 533
Net cash used in financing activities                 563,884 282,980 244,649
Net decrease in cash and cash equivalents                 8,098 780 (6,940)
Cash and cash equivalents, beginning of year       34,265       33,485 34,265 33,485 40,425
Cash and cash equivalents, end of year 42,363       34,265       42,363 34,265 33,485
Holding Company [Member]                      
Operating activities:                      
Net income                 46,209 44,239 37,752
Adjustments to reconcile net income to net cash provided by operating activities:                      
Equity in undistributed earnings of the Bank                 (21,884) (24,105) (21,450)
Net gain on sale of securities                     (17)
Deferred income tax (benefit) provision                 575 17 (2,348)
Fair value adjustments for financial assets and financial liabilities                 231 (779) 5,475
Stock based compensation expense                 4,676 4,246 3,068
Net change in operating assets and liabilities                 2,174 2,088 1,746
Net cash provided by operating activities                 31,981 25,706 24,226
Investing activities:                      
Purchases of securities available for sale                   (22) (23)
Proceeds from sales and calls of securities available for sale                   1,699 517
Net cash provided by investing activities                   1,677 494
Financing activities:                      
Purchase of treasury stock                 (15,605) (18,872) (14,151)
Cash dividends paid                 (18,616) (17,852) (15,618)
Stock options exercised                 145 565 533
Net cash used in financing activities                 (34,076) (36,159) (29,236)
Net decrease in cash and cash equivalents                 (2,095) (8,776) (4,516)
Cash and cash equivalents, beginning of year       $ 7,749       $ 16,525 7,749 16,525 21,041
Cash and cash equivalents, end of year $ 5,654       $ 7,749       $ 5,654 $ 7,749 $ 16,525