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Parent Only Financial Information Parent Only Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Interest-Bearing Deposits at Banks | $ 30,276 | $ 14,331 |  |
Available-for-Sale | 300,200 | 346,996 |  |
Held-to-Maturity (Approximate Fair Value of $335,901 at December 31, 2017, and $343,751 at December 31, 2016) | 335,907 | 345,427 |  |
Other Assets | 57,606 | 56,789 |  |
Total Assets | 2,760,465 | 2,605,242 |  |
LIABILITIES |  |  |  |
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts | 20,000 | 20,000 |  |
Other Liabilities | 20,780 | 22,008 |  |
Total Liabilities | 2,510,862 | 2,372,390 |  |
Equity [Abstract] |  |  |  |
Stockholders' Equity Attributable to Parent | 249,603 | 232,852 | $ 213,971 | $ 200,926
Total Liabilities and Stockholders' Equity | 2,760,465 | 2,605,242 |  |
Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Interest-Bearing Deposits at Banks | 2,186 | 3,593 |  |
Available-for-Sale | 1,562 | 1,382 |  |
Held-to-Maturity (Approximate Fair Value of $335,901 at December 31, 2017, and $343,751 at December 31, 2016) | 0 | 1,000 |  |
Equity Method Investments | 261,622 | 243,031 |  |
Other Assets | 7,987 | 7,951 |  |
Total Assets | 273,357 | 256,957 |  |
LIABILITIES |  |  |  |
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts | 20,000 | 20,000 |  |
Other Liabilities | 3,754 | 4,105 |  |
Total Liabilities | 23,754 | 24,105 |  |
Equity [Abstract] |  |  |  |
Stockholders' Equity Attributable to Parent | 249,603 | 232,852 |  |
Total Liabilities and Stockholders' Equity | $ 273,357 | $ 256,957 |  |

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