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PARENT COMPANY STATEMENTS, Condensed Statements of Condition (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |
Cash and cash equivalents | $ 205,030 | $ 211,834 | $ 221,038 | $ 173,857
Investment in and advances to [Abstract] |  |  |  |
Other assets | 243,082 | 223,498 |  |
Total assets | 11,410,295 | 10,607,295 | 10,746,198 |
Liabilities and shareholders' equity [Abstract] |  |  |  |
Accrued interest and other liabilities | 215,221 | 157,459 |  |
Borrowings | 77,320 | 97,939 |  |
Shareholders' equity | 1,855,234 | 1,713,783 | 1,635,315 | 1,198,100
Total liabilities and shareholders' equity | 11,410,295 | 10,607,295 |  |
Parent Company [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Cash and cash equivalents | 180,663 | 116,133 | $ 84,460 | $ 151,127
Investment securities | 2,853 | 3,452 |  |
Investment in and advances to [Abstract] |  |  |  |
Bank subsidiary | 1,594,790 | 1,522,109 |  |
Non-bank subsidiaries | 180,487 | 182,617 |  |
Other assets | 12,406 | 8,957 |  |
Total assets | 1,971,199 | 1,833,268 |  |
Liabilities and shareholders' equity [Abstract] |  |  |  |
Accrued interest and other liabilities | 24,850 | 21,546 |  |
Borrowings | 91,115 | 97,939 |  |
Shareholders' equity | 1,855,234 | 1,713,783 |  |
Total liabilities and shareholders' equity | $ 1,971,199 | $ 1,833,268 |  |

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