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Note 13 - Stockholders' Equity - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss) (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
Tax expense (benefit) $ 1,046 $ 1,910 $ 4,489 $ 2,950 $ 7,693 $ 5,291 $ 6,775 $ 5,254 $ 10,395 $ 25,013 $ 41,103
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
Other expense                 (15,235) (15,239) (14,739)
Total before tax 13,468 19,243 18,412 14,362 13,650 15,470 19,500 17,514 65,485 66,134 106,019
Tax expense (benefit) $ (1,046) $ (1,910) $ (4,489) $ (2,950) $ (7,693) $ (5,291) $ (6,775) $ (5,254) (10,395) (25,013) (41,103)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]                      
Net loss on sale of securities                 (1,920) (186) 1,524
Tax expense (benefit)                 595 78 (638)
Net income, as reported                 (1,325) (108) 886
Tax expense (benefit)                 (595) (78) 638
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] | Interest Rate Swap [Member]                      
Tax expense (benefit)                 32 58  
Net income, as reported                 (72) (126)  
Other expense                 (104) (184)  
Tax expense (benefit)                 (32) (58)  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]                      
Other expense [1]                 (530) (605) (568)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]                      
Other expense [1]                 39 45 45
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                      
Tax expense (benefit)                 155 237 (220)
Net income, as reported                 (336) (323) (303)
Total before tax                 (491) (560) (523)
Tax expense (benefit)                 $ (155) $ (237) $ 220
[1] These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 12 of the Notes to Consolidated Financial Statements "Pension and Other Postretirement Benefit Plans").