Stock-Based Compensation Plans (Schedule of Stock Option Activity) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Number of Shares
Options outstanding, beginning	219,399	[1]
Granted	3,000	[1]
Exercised	(157,956)	[1]
Forfeited and expired	(5,700)	[1]
Options outstanding, ending	58,743	[1]
Options exercisable	49,293	[1]
Weighted Average Exercise Price Per Share
Options outstanding, beginning | $ / shares	$ 16.93
Granted | $ / shares	25.64
Exercised | $ / shares	15.53
Forfeited and expired | $ / shares	22.93
Options outstanding, ending | $ / shares	20.38
Options exercisable | $ / shares	$ 19.62
Weighted- Average Remaining Contractual Term
Options outstanding	3 years 9 months 26 days
Options exercisable	3 years 10 months 28 days
Aggregate Intrinsic Value
Options outstanding | $	$ 1,558
Options exercisable | $	$ 1,224
SBM Financial, Inc. [Member]
Number of Shares
Options outstanding, beginning	118,299	[1]
Exercised	(109,356)	[1]
Options exercisable	8,943	[1]

[1] (1) Options outstanding at January 1, 2016 included 118,299 of non-qualified stock options issued in conjunction with the Merger. Of these, 109,356 were exercised during 2016. At December 31, 2016, 8,943 non-qualified stock options issued in conjunction with the Merger were outstanding and exercisable.