Goodwill and Intangibles Assets - Goodwill and Intangible Assets Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Goodwill [Roll Forward]
Balance December 31, 2018	$ 184,012
Additions	0
Adjustments	0
Balance March 31, 2019	184,012
Finite-lived Intangible Assets [Roll Forward]
Additions	18
Intangible assets amortization	(938)	$ (879)
Indefinite-lived Intangible Assets [Roll Forward]
Total Intangible Assets	23,455
Additions	18
Adjustments	(541)
Intangible assets amortization	(938)	$ (879)
Total Intangible Assets	21,994
Total Goodwill and Intangible Assets, beginning balance	207,467
Intangible Assets (Including Goodwill) Acquired	18
Grand Total adjustments	(541)
Intangible assets amortization	(938)
Total Goodwill and Intangible Assets, ending balance	206,006
Domain Name
Indefinite-lived Intangible Assets [Roll Forward]
Indefinite-lived intangible assets	151
Indefinite-lived intangible assets acquired	0
Indefinite-lived intangible assets	151
Core deposit intangible
Finite-lived Intangible Assets [Roll Forward]
Balance December 31, 2018	5,906
Additions	0
Intangible assets amortization	(327)
Balance September 30, 2018	$ 5,579
Intangible asset amortization period (Year)	10 years
Indefinite-lived Intangible Assets [Roll Forward]
Additions	$ 0
Intangible assets amortization	(327)
Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Balance December 31, 2018	13,607
Additions	18
Intangible assets amortization	(438)
Balance September 30, 2018	13,187
Indefinite-lived Intangible Assets [Roll Forward]
Additions	18
Intangible assets amortization	$ (438)
Customer relationships | Minimum
Finite-lived Intangible Assets [Roll Forward]
Intangible asset amortization period (Year)	10 years
Customer relationships | Maximum
Finite-lived Intangible Assets [Roll Forward]
Intangible asset amortization period (Year)	20 years
Non-compete agreements
Finite-lived Intangible Assets [Roll Forward]
Balance December 31, 2018	$ 1,101
Additions	0
Intangible assets amortization	(48)
Balance September 30, 2018	1,053
Indefinite-lived Intangible Assets [Roll Forward]
Additions	0
Intangible assets amortization	$ (48)
Non-compete agreements | Minimum
Finite-lived Intangible Assets [Roll Forward]
Intangible asset amortization period (Year)	5 years
Non-compete agreements | Maximum
Finite-lived Intangible Assets [Roll Forward]
Intangible asset amortization period (Year)	10 years
Trade name
Finite-lived Intangible Assets [Roll Forward]
Balance December 31, 2018	$ 2,149
Additions	0
Intangible assets amortization	(125)
Balance September 30, 2018	2,024
Indefinite-lived Intangible Assets [Roll Forward]
Additions	0
Intangible assets amortization	$ (125)
Trade name | Minimum
Finite-lived Intangible Assets [Roll Forward]
Intangible asset amortization period (Year)	3 years
Trade name | Maximum
Finite-lived Intangible Assets [Roll Forward]
Intangible asset amortization period (Year)	5 years
Favorable lease assets
Finite-lived Intangible Assets [Roll Forward]
Balance December 31, 2018	$ 541
Additions	0
Intangible assets amortization	0
Balance September 30, 2018	0
Indefinite-lived Intangible Assets [Roll Forward]
Additions	0
Adjustments	(541)
Intangible assets amortization	0
Goodwill – Wealth
Goodwill [Roll Forward]
Balance December 31, 2018	20,412
Additions	0
Adjustments	0
Balance March 31, 2019	20,412
Goodwill – Banking
Goodwill [Roll Forward]
Balance December 31, 2018	156,991
Additions	0
Adjustments	0
Balance March 31, 2019	156,991
Goodwill – Insurance
Goodwill [Roll Forward]
Balance December 31, 2018	6,609
Additions	0
Adjustments	0
Balance March 31, 2019	$ 6,609