Other Operating Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other operating expense components [Line Items]
Insurance	$ 3,084	$ 3,286	$ 3,396
Employee travel and meals	2,918	3,910	3,309
Other	2,843	2,852	2,892
Publications and dues	1,893	1,541	1,035
Publications and dues	1,123	1,028	984
Postage, express mail, and courier	840	974	967
Forms and supplies	704	890	836
Trading errors	511	108	158
Pension costs - non service	423	(95)	(916)
OREO expenses	(21)	4	227
Provision/ (credit) for off-balance sheet loan commitments	(157)	(24)	(367)
Other Noninterest Expense	14,161	14,474	12,521
Salaries and employee benefits	161,468	178,501	164,683
Accounting Standards Update 2017-07
Other operating expense components [Line Items]
Other Noninterest Expense	$ 423
Restatement Adjustment | Accounting Standards Update 2017-07
Other operating expense components [Line Items]
Other Noninterest Expense		95	916
Salaries and employee benefits		$ (95)	$ (916)