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Parent Company Only Financial Information - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Trading securities | $ 7,150 | $ 4,858 |  |
Total Assets | 2,768,773 | 2,573,821 |  |
Liabilities |  |  |  |
Subordinated debentures | 70,620 | 70,620 |  |
Total liabilities | 2,524,863 | 2,362,037 |  |
Total shareholders' equity | 243,910 | 211,784 | $ 201,913 | $ 188,548
Total Liabilities and Shareholders' Equity | 2,768,773 | 2,573,821 |  |
Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Cash | 1,556 | 1,436 |  |
Trading securities | 580 | 529 |  |
Investment in bank subsidiary | 290,156 | 257,476 |  |
Investment in non-bank subsidiaries | 21,781 | 23,324 |  |
Deferreds and Current Receivable | 2,055 | 1,066 |  |
Other assets | 2,059 | 2,666 |  |
Total Assets | 318,187 | 286,497 |  |
Liabilities |  |  |  |
Borrowings from subsidiary | 1,400 | 1,400 |  |
Subordinated debentures | 70,620 | 70,620 |  |
Other liabilities | 2,257 | 2,693 |  |
Total liabilities | 74,277 | 74,713 |  |
Total shareholders' equity | 243,910 | 201,913 |  |
Total Liabilities and Shareholders' Equity | $ 318,187 | $ 286,497 |  |

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