Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Other operating income (in-scope of Topic 606)	$ 1,519	$ 1,415	$ 2,861	$ 2,810
Other operating income (out-of-scope of Topic 606)	6,795	8,347	12,915	15,857
Total Other Operating Income	8,314	9,762	15,776	18,667
Bankcard fees
Disaggregation of Revenue [Line Items]
Other operating income (in-scope of Topic 606)	707	658	1,332	1,239
Service charges on deposit accounts
Disaggregation of Revenue [Line Items]
Other operating income (in-scope of Topic 606)	376	409	730	848
Other
Disaggregation of Revenue [Line Items]
Other operating income (in-scope of Topic 606)	$ 436	$ 348	$ 799	$ 723