Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 393,940	$ 374,343
Gross Unrealized Gains	4,268	2,263
Gross Unrealized Losses	(2,973)	(6,611)
Fair Value	395,235	369,995
Corporate bonds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,238	1,343
Gross Unrealized Gains	7	4
Gross Unrealized Losses	(4)	(8)
Fair Value	1,241	1,339
Small Business Administration
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	15,429	17,236
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(329)	(530)
Fair Value	15,100	16,706
U.S. Treasury and U.S. government sponsored entities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	8,728	5,970
Gross Unrealized Gains	5	5
Gross Unrealized Losses	(25)	(54)
Fair Value	8,708	5,921
State and political subdivisions
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	182,206	157,014
Gross Unrealized Gains	3,127	1,049
Gross Unrealized Losses	(906)	(2,760)
Fair Value	184,427	155,303
Mortgage-backed securities - residential
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	167,419	171,215
Gross Unrealized Gains	921	1,019
Gross Unrealized Losses	(1,103)	(2,552)
Fair Value	167,237	169,682
Collateralized mortgage obligations - residential
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	18,745	21,397
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(605)	(705)
Fair Value	18,140	20,693
Equity securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	175	168
Gross Unrealized Gains	208	185
Gross Unrealized Losses	(1)	(2)
Fair Value	$ 382	$ 351