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Note 22 - Condensed Financial Information (Parent Company Only) - Condensed Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Provision for income taxes $ 61,983 $ 46,624 $ 32,900
NET INCOME 92,940 96,814 74,364
Preferred stock dividends 24 257
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS 92,940 96,790 74,107
Parent Company [Member]      
Income Statement [Abstract]      
Dividends from subsidiaries 69,107 83,710 84,128
Other income 4,111 2,465 2,303
Income 73,218 86,175 86,431
EXPENSE 32,234 21,990 24,594
Income before income taxes and equity in undistributed net income of subsidiaries 40,984 64,185 61,837
Provision for income taxes (12,311) (7,557) (8,251)
Income before equity in undistributed net income of subsidiaries 53,295 71,742 70,088
Equity in undistributed net income of subsidiaries 39,645 25,072 4,276
NET INCOME 92,940 96,814 74,364
Preferred stock dividends 24 257
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS $ 92,940 $ 96,790 $ 74,107