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Note 22 - Parent Company Only 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
Net income, as reported $ 5,957 $ 10,179 $ 12,725 $ 12,260 $ 14,286 $ 10,634 $ 30,435 $ 9,561 $ 41,121 $ 64,916 $ 46,209
Deferred income tax (benefit) provision                 8,735 (1,540) (5,210)
Fair value adjustments for financial assets and financial liabilities                 3,465 3,434 1,841
Stock-based compensation expense                 5,990 5,884 4,845
Net cash provided by operating activities                 83,526 42,395 44,730
Proceeds from sales and calls of securities available for sale                 194,799 143,819 163,158
Net cash provided (used in) investing activities                 (254,114) (322,232) (600,516)
Issuance of subordinated debt, net                 73,402
Purchase of treasury stock                 (9,290) (9,858) (15,605)
Proceeds from stock options exercised                 328 145
Net cash (used in) provided by financing activities                 186,277 273,331 563,884
Net (decrease) increase in cash and cash equivalents                 15,689 (6,506) 8,098
Cash and cash equivalents, beginning of year       35,857       42,363 35,857 42,363 34,265
Cash and cash equivalents, end of year 51,546       35,857       51,546 35,857 42,363
Holding Company [Member]                      
Net income, as reported                 41,121 64,916 46,209
Equity in undistributed earnings of the Bank                 (22,307) (45,167) (21,884)
Deferred income tax (benefit) provision                 (3,990) (2,316) 575
Fair value adjustments for financial assets and financial liabilities                 2,903 4,761 231
Stock-based compensation expense                 5,990 5,120 4,676
Net change in operating assets and liabilities                 2,453 3,318 2,174
Net cash provided by operating activities                 26,170 30,632 31,981
Investment in Bank                 (66,497) 0
Proceeds from sales and calls of securities available for sale                 300 0
Net cash provided (used in) investing activities                 300 (66,497)
Issuance of subordinated debt, net                 73,402 0
Purchase of treasury stock                 (9,290) (9,858) (15,605)
Cash dividends paid                 (20,954) (19,689) (18,616)
Proceeds from stock options exercised                 328 145
Net cash (used in) provided by financing activities                 (30,244) 44,183 (34,076)
Net (decrease) increase in cash and cash equivalents                 (3,774) 8,318 (2,095)
Cash and cash equivalents, beginning of year       $ 13,972       $ 5,654 13,972 5,654 7,749
Cash and cash equivalents, end of year $ 10,198       $ 13,972       $ 10,198 $ 13,972 $ 5,654