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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net income, as reported $ 12,422 $ 17,333 $ 13,923 $ 11,412 $ 5,957 $ 10,179 $ 12,725 $ 12,260 $ 55,090 $ 41,121 $ 64,916
Deferred income tax benefit                 (2,664) 8,735 (1,540)
Fair value adjustments for financial assets and financial liabilities                 4,122 3,465 3,434
Stock-based compensation expense                 7,016 5,990 5,884
Net cash provided by operating activities                 77,303 83,526 42,395
Proceeds from sales and calls of securities available for sale                 128,474 194,799 143,819
Net cash provided (used in) investing activities                 (477,995) (254,114) (322,232)
Issuance of subordinated debt, net                 73,402
Purchase of treasury stock                 (22,585) (9,290) (9,858)
Proceeds from stock options exercised                 6 328
Net cash (used in) provided by financing activities                 467,707 186,277 273,331
Net (decrease) increase in cash and cash equivalents                 67,015 15,689 (6,506)
Cash and cash equivalents, beginning of year       51,546       35,857 51,546 35,857 42,363
Cash and cash equivalents, end of year 118,561       51,546       118,561 51,546 35,857
Holding Company [Member]                      
Net income, as reported                 55,090 41,121 64,916
Equity in undistributed earnings of the Bank                 (29,547) (22,307) (45,167)
Deferred income tax benefit                 (1,915) (3,990) (2,316)
Fair value adjustments for financial assets and financial liabilities                 4,769 2,903 4,761
Stock-based compensation expense                 7,016 5,990 5,120
Net change in operating assets and liabilities                 4,246 2,453 3,318
Net cash provided by operating activities                 39,659 26,170 30,632
Investment in Bank                 (66,497)
Proceeds from sales and calls of securities available for sale                 300
Net cash provided (used in) investing activities                 300 (66,497)
Issuance of subordinated debt, net                 73,402
Purchase of treasury stock                 (22,585) (9,290) (9,858)
Cash dividends paid                 (22,927) (20,954) (19,689)
Proceeds from stock options exercised                 6 328
Net cash (used in) provided by financing activities                 (45,506) (30,244) 44,183
Net (decrease) increase in cash and cash equivalents                 (5,847) (3,774) 8,318
Cash and cash equivalents, beginning of year       $ 10,198       $ 13,972 10,198 13,972 5,654
Cash and cash equivalents, end of year $ 4,351       $ 10,198       $ 4,351 $ 10,198 $ 13,972