Consolidated Balance Sheets (Parenthetical) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Mortgage Loans:
Mortgages Held-for-sale, Fair Value Disclosure	$ 11,320,000	$ 9,263,000
Investment Securities:
Available-for-sale Securities Pledged as Collateral	$ 667,199,000	$ 568,553,000
Stockholders' Equity:
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	6,000	6,000
Common stock, par value	$ 5.00	$ 5.00
Common Stock, Shares Authorized	120,000,000	120,000,000
Common stock, shares issued	102,003,046	102,003,046
Treasury stock, shares	197,566	364,711