Employee Benefit And Stock Compensation Plans - Summary Of Changes In Stock Option Awards (Details)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Changes in shares under option awards
Shares, Outstanding - beginning of year | shares	461,050
Shares, Granted | shares	57,233
Shares, Exercised | shares	(216,268)
Shares, Forfeited | shares	(16,016)
Shares, Outstanding - end of year | shares	285,999
Shares, Exercisable - end of year | shares	178,521
Weighted average exercise price, Outstanding - beginning of year | $ / shares	$ 8.87
Weighted average exercise price, Granted | $ / shares	11.95
Weighted average exercise price, Exercised | $ / shares	7.77
Weighted average exercise price, Forfeited | $ / shares	6.67
Weighted average exercise price, Outstanding - end of year | $ / shares	10.45
Weighted average exercise price, Exercisable - end of year | $ / shares	$ 9.56