CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Investment securities:
Held to maturity, estimated fair value	$ 168,148	$ 168,148	$ 139,688
Common stock:
Common stock, par value (in dollars per share)	$ 1	$ 1	$ 1
Common stock, shares authorized (in shares)	100,600,000	100,600,000	100,600,000
Common stock, shares issued (in shares)	7,609,194	7,609,194	6,923,206
Treasury stock (in shares)	0	0	3,184
Common stock, dividend percentage	10.00%	10.00%	10.00%
Common stock, dividend paid date		Dec. 17, 2015
Common stock, dividend record date		Dec. 10, 2015
Series C Preferred Stock [Member]
Preferred stock:
Preferred stock, par value (in dollars per share)	$ 1,000	$ 1,000	$ 1,000
Preferred stock, shares authorized (in shares)	39,435	39,435	39,435
Preferred stock, shares issued (in shares)	0	0	39,435
Preferred stock, shares outstanding (in shares)	0	0	39,435