Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings	$ 319,396	$ 265,007
Revenue, performance obligation, description of timing	one year or less
Noninterest Income (in-scope of ASC 606)	$ 65,961	63,091
Noninterest Income (out-of-scope of ASC 606)	11,488	6,113
Noninterest income	77,449	69,204	$ 68,808
Contract with customer, liability	1,800	1,700
Insurance
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer, asset, net	4,300	4,000
Wealth Management
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer, asset, net	1,800	1,900
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings				$ 1,800
Contingent Income [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer, asset, net	$ 1,900	$ 2,400