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Parent Company Financial Statements, Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Cash flows from operating activities: |  |  |
Net income | $ 46,432 | $ 43,251 | $ 45,172
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 3,932 | 4,314 | 4,562
Stock-based compensation | 783 | 852 | 698
Excess tax benefits of stock-based compensation | 104 | 760 | 572
Changes in: |  |  |
Other assets | (6,274) | (60) | 4,647
Other liabilities | (2,488) | (1,339) | 323
Net cash provided by operating activities | 54,979 | 57,528 | 90,716
Cash flows from investing activities: |  |  |
Purchase of premises and equipment | (2,246) | (2,081) | (2,105)
Net cash used in investing activities | (108,349) | (144,076) | (122,046)
Cash flows from financing activities: |  |  |
Issuance of common stock | 2,082 | 1,992 | 6,348
Netting of common stock | (189) | 0 | 0
Excess tax benefits of stock-based compensation | (104) | (760) | (572)
Dividends paid | (21,330) | (20,570) | (24,546)
Net cash provided by (used in) financing activities | 135,464 | 85,424 | (69,589)
Net increase (decrease) in cash and cash equivalents | 82,094 | (1,124) | (100,919)
Cash and cash equivalents at beginning of year | 105,517 | 106,641 | 207,560
Cash and cash equivalents at end of year | 187,611 | 105,517 | 106,641
Parent Company [Member] |  |  |
Cash flows from operating activities: |  |  |
Net income | 46,432 | 43,251 | 45,172
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 130 | 153 | 163
Equity in undistributed earnings of subsidiaries | (28,604) | (25,807) | (33,942)
Stock-based compensation | 783 | 838 | 658
Excess tax benefits of stock-based compensation | 104 | 760 | 572
Changes in: |  |  |
Other assets | 240 | (558) | 660
Other liabilities | 968 | 563 | 1,505
Net cash provided by operating activities | 20,053 | 19,200 | 14,788
Cash flows from investing activities: |  |  |
Purchase of premises and equipment | (45) | (125) | (148)
Repayment of investments in and advances to subsidiaries | 0 | (14) | (40)
Net cash used in investing activities | (45) | (139) | (188)
Cash flows from financing activities: |  |  |
Issuance of common stock | 2,082 | 1,992 | 6,348
Netting of common stock | (189) | 0 | 0
Excess tax benefits of stock-based compensation | (104) | (760) | (572)
Dividends paid | (21,330) | (20,570) | (24,546)
Net cash provided by (used in) financing activities | (19,541) | (19,338) | (18,770)
Net increase (decrease) in cash and cash equivalents | 467 | (277) | (4,170)
Cash and cash equivalents at beginning of year | 995 | 1,272 | 5,442
Cash and cash equivalents at end of year | $ 1,462 | $ 995 | $ 1,272

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