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Note 26 - Parent Company Financial Information - Condensed Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | 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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Gain on sale of investment securities |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,194 | $ 2,254 | $ 22
Total interest expense | $ 8,771 | $ 7,703 | $ 5,950 | $ 5,216 | $ 4,735 | $ 4,896 | $ 4,873 | $ 4,734 | $ 4,275 | $ 3,251 | $ 2,739 | $ 2,830 | 27,640 | 19,238 | 13,095
Legal, accounting and professional fees |  |  |  |  |  |  |  |  |  |  |  |  | 3,673 | 3,729 | 3,439
Other expenses |  |  |  |  |  |  |  |  |  |  |  |  | 15,255 | 15,636 | 10,510
Income Before Income Tax Expense | 42,146 | 40,007 | 39,214 | 37,735 | 35,833 | 34,517 | 33,714 | 31,152 | 24,074 | 22,142 | 20,562 | 19,438 | 159,102 | 135,216 | 86,216
Income Tax Expense | 16,429 | 15,484 | 15,069 | 14,413 | 13,485 | 13,054 | 12,776 | 11,734 | 9,347 | 8,054 | 7,618 | 6,939 | 61,395 | 51,049 | 31,958
Net Income | 25,717 | 24,523 | 24,145 | 23,322 | 22,348 | 21,463 | 20,938 | 19,418 | 14,727 | 14,088 | 12,944 | 12,499 | 97,707 | 84,167 | 54,258
Preferred Stock Dividends |  |  |  |  | 62 | 180 | 179 | 180 | 180 | 151 | 142 | 141 |  | 601 | 614
Net income available to common shareholders | $ 25,717 | $ 24,523 | $ 24,145 | $ 23,322 | $ 22,286 | $ 21,283 | $ 20,759 | $ 19,238 | $ 14,547 | $ 13,937 | $ 12,802 | $ 12,358 | 97,707 | 83,566 | 53,644
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other interest and dividends |  |  |  |  |  |  |  |  |  |  |  |  | 280 | 369 | 171
Gain on sale of investment securities |  |  |  |  |  |  |  |  |  |  |  |  | 43 | 60 |
Total Income |  |  |  |  |  |  |  |  |  |  |  |  | 323 | 429 | 171
Total interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 7,493 | 4,490 | 2,497
Legal, accounting and professional fees |  |  |  |  |  |  |  |  |  |  |  |  | 131 | 101 | 108
Directors compensation |  |  |  |  |  |  |  |  |  |  |  |  | 202 | 224 | 257
Other expenses |  |  |  |  |  |  |  |  |  |  |  |  | 1,083 | 1,212 | 1,086
Total Expenses |  |  |  |  |  |  |  |  |  |  |  |  | 8,909 | 6,027 | 3,948
Income Before Income Tax Expense |  |  |  |  |  |  |  |  |  |  |  |  | (8,586) | (5,598) | (3,777)
Income Tax Expense |  |  |  |  |  |  |  |  |  |  |  |  | (2,919) | (2,208) | (1,490)
Loss Before Equity in Undistributed Income of Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | (5,667) | (3,390) | (2,287)
Equity in Undistributed Income of Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  | 103,374 | 87,557 | 56,545
Net Income |  |  |  |  |  |  |  |  |  |  |  |  | 97,707 | 84,167 | 54,258
Preferred Stock Dividends |  |  |  |  |  |  |  |  |  |  |  |  |  | 601 | 614
Net income available to common shareholders |  |  |  |  |  |  |  |  |  |  |  |  | $ 97,707 | $ 83,566 | $ 53,644

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