Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investment securities:
Held-to-maturity, at fair value	$ 44,505	$ 53,937
Stockholders Equity
Convertible preferred stock, no par value (in dollars per share)	$ 0	$ 0
Convertible preferred stock, authorized (in shares)	1,000,000	1,000,000
Convertible preferred stock, issued (in shares)	5,500	5,500
Common stock, par value (in dollars per share)	$ 4	$ 4
Common stock, authorized (in shares)	18,000,000	18,000,000
Common stock, issued (in shares)	8,422,018	7,529,815
Treasury stock (in shares)	545,041	496,497