Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Other operating income (in-scope of Topic 606)	$ 1,342	$ 1,395
Other operating income (out-of-scope of Topic 606)	6,120	7,510
Total Other Operating Income	7,462	8,905
Bankcard fees
Disaggregation of Revenue [Line Items]
Other operating income (in-scope of Topic 606)	625	581
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Other operating income (in-scope of Topic 606)	354	439
Other
Disaggregation of Revenue [Line Items]
Other operating income (in-scope of Topic 606)	$ 363	$ 375