Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investment securities:
Held-to-maturity Securities, Fair Value	$ 73,096	$ 85,737
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)	0	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)	13,020,742	9,003,710
Treasury stock (in shares)	549,743	549,743