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PARENT COMPANY STATEMENTS, Condensed Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |
Cash and cash equivalents | $ 173,857 | $ 153,210 | $ 138,396 | $ 149,647
Investment in and advances to [Abstract] |  |  |  |
Other assets | 180,188 | 170,129 |  |
Total assets | 8,666,437 | 8,552,669 | 7,489,440 |
Liabilities and shareholders' equity [Abstract] |  |  |  |
Accrued interest and other liabilities | 144,013 | 135,102 |  |
Borrowings | 102,170 | 102,146 |  |
Shareholders' equity | 1,198,100 | 1,140,647 | 987,904 | 875,812
Total liabilities and shareholders' equity | 8,666,437 | 8,552,669 |  |
Parent Company [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash and cash equivalents | 151,127 | 97,317 | $ 106,957 | $ 83,783
Investment securities | 3,628 | 3,576 |  |
Investment in and advances to [Abstract] |  |  |  |
Bank subsidiary | 1,116,554 | 1,117,419 |  |
Non-bank subsidiaries | 35,566 | 30,643 |  |
Other assets | 10,345 | 9,996 |  |
Total assets | 1,317,220 | 1,258,951 |  |
Liabilities and shareholders' equity [Abstract] |  |  |  |
Accrued interest and other liabilities | 16,950 | 16,158 |  |
Borrowings | 102,170 | 102,146 |  |
Shareholders' equity | 1,198,100 | 1,140,647 |  |
Total liabilities and shareholders' equity | $ 1,317,220 | $ 1,258,951 |  |

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