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Note 22 - Parent Company Only Financial Information (Details) - Condensed Statements of Cash Flows for the Holding Company: - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 11,634 | $ 11,008 | $ 14,834 | $ 8,733 | $ 11,057 | $ 11,201 | $ 11,685 | $ 10,296 | $ 46,209 | $ 44,239 | $ 37,752
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Net gain on sale of securities |  |  |  |  |  |  |  |  | (167) | (2,875) | (3,021)
Deferred income tax (benefit) provision |  |  |  |  |  |  |  |  | (5,210) | 4,154 | (682)
Fair value adjustments for financial assets and financial liabilities |  |  |  |  |  |  |  |  | 1,841 | 2,568 | 2,521
Stock based compensation expense |  |  |  |  |  |  |  |  | 4,845 | 4,263 | 3,412
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 44,730 | 57,376 | 74,435
Investing activities: |  |  |  |  |  |  |  |  |  |  |
Purchases of securities available for sale |  |  |  |  |  |  |  |  | (313,822) | (162,830) | (458,596)
Proceeds from sales and calls of securities available for sale |  |  |  |  |  |  |  |  | 163,158 | 115,294 | 194,009
Net cash provided by investing activities |  |  |  |  |  |  |  |  | (600,516) | (339,576) | (326,024)
Financing activities: |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  |  |  |  |  | (15,605) | (18,872) | (14,151)
Cash dividends paid |  |  |  |  |  |  |  |  | (18,616) | (17,852) | (15,618)
Stock options exercised |  |  |  |  |  |  |  |  | 145 | 565 | 533
Net cash used in financing activities |  |  |  |  |  |  |  |  | 563,884 | 282,980 | 244,649
Net decrease in cash and cash equivalents |  |  |  |  |  |  |  |  | 8,098 | 780 | (6,940)
Cash and cash equivalents, beginning of year |  |  |  | 34,265 |  |  |  | 33,485 | 34,265 | 33,485 | 40,425
Cash and cash equivalents, end of year | 42,363 |  |  |  | 34,265 |  |  |  | 42,363 | 34,265 | 33,485
Holding Company [Member] |  |  |  |  |  |  |  |  |  |  |
Operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 46,209 | 44,239 | 37,752
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed earnings of the Bank |  |  |  |  |  |  |  |  | (21,884) | (24,105) | (21,450)
Net gain on sale of securities |  |  |  |  |  |  |  |  |  |  | (17)
Deferred income tax (benefit) provision |  |  |  |  |  |  |  |  | 575 | 17 | (2,348)
Fair value adjustments for financial assets and financial liabilities |  |  |  |  |  |  |  |  | 231 | (779) | 5,475
Stock based compensation expense |  |  |  |  |  |  |  |  | 4,676 | 4,246 | 3,068
Net change in operating assets and liabilities |  |  |  |  |  |  |  |  | 2,174 | 2,088 | 1,746
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 31,981 | 25,706 | 24,226
Investing activities: |  |  |  |  |  |  |  |  |  |  |
Purchases of securities available for sale |  |  |  |  |  |  |  |  |  | (22) | (23)
Proceeds from sales and calls of securities available for sale |  |  |  |  |  |  |  |  |  | 1,699 | 517
Net cash provided by investing activities |  |  |  |  |  |  |  |  |  | 1,677 | 494
Financing activities: |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  |  |  |  |  | (15,605) | (18,872) | (14,151)
Cash dividends paid |  |  |  |  |  |  |  |  | (18,616) | (17,852) | (15,618)
Stock options exercised |  |  |  |  |  |  |  |  | 145 | 565 | 533
Net cash used in financing activities |  |  |  |  |  |  |  |  | (34,076) | (36,159) | (29,236)
Net decrease in cash and cash equivalents |  |  |  |  |  |  |  |  | (2,095) | (8,776) | (4,516)
Cash and cash equivalents, beginning of year |  |  |  | $ 7,749 |  |  |  | $ 16,525 | 7,749 | 16,525 | 21,041
Cash and cash equivalents, end of year | $ 5,654 |  |  |  | $ 7,749 |  |  |  | $ 5,654 | $ 7,749 | $ 16,525

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