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Condensed Statements of Financial Condition (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash on hand and in banks | $ 139,948 | $ 135,268 |  |
Interest bearing cash deposits | 60,056 | 17,273 |  |
Cash and cash equivalents | 200,004 | 152,541 |  |
Investment securities, available-for-sale | 1,778,243 | 2,425,477 |  |
Other assets | 96,398 | 74,035 |  |
Total assets | 9,706,349 | 9,450,600 |  |
Liabilities and Stockholders' Equity |  |  |  |
Dividends payable | 265 | 23,137 | $ 22,893 |
Subordinated debentures | 126,135 | 125,991 |  |
Other liabilities | 73,168 | 102,038 |  |
Total liabilities | 8,507,292 | 8,333,731 |  |
Common stock | 780 | 765 |  |
Paid-in capital | 797,997 | 749,107 |  |
Retained earnings | 402,259 | 374,379 |  |
Accumulated other comprehensive loss | (1,979) | (7,382) |  |
Total stockholders’ equity | 1,199,057 | 1,116,869 | $ 1,076,650 | $ 1,028,047
Total liabilities and stockholders’ equity | 9,706,349 | 9,450,600 |  |
Parent Company |  |  |  |
Assets |  |  |  |
Cash on hand and in banks | 9,304 | 5,906 |  |
Interest bearing cash deposits | 38,420 | 57,700 |  |
Cash and cash equivalents | 47,724 | 63,606 |  |
Investment securities, available-for-sale | 0 | 36 |  |
Other assets | 8,871 | 10,764 |  |
Investment in subsidiaries | 1,281,392 | 1,201,667 |  |
Total assets | 1,337,987 | 1,276,073 |  |
Liabilities and Stockholders' Equity |  |  |  |
Dividends payable | 265 | 23,137 |  |
Subordinated debentures | 126,135 | 125,991 |  |
Other liabilities | 12,530 | 10,076 |  |
Total liabilities | 138,930 | 159,204 |  |
Common stock | 780 | 765 |  |
Paid-in capital | 797,997 | 749,107 |  |
Retained earnings | 402,259 | 374,379 |  |
Accumulated other comprehensive loss | (1,979) | (7,382) |  |
Total stockholders’ equity | 1,199,057 | 1,116,869 |  |
Total liabilities and stockholders’ equity | $ 1,337,987 | $ 1,276,073 |  |

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