Goodwill and Intangible Assets, Summary of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary of core deposit intangibles and other intangibles
Amortization of Intangible Assets	$ 9,948	$ 8,159	$ 1,959
Core Deposits [Member]
Summary of core deposit intangibles and other intangibles
Gross carrying amount	80,730	58,100	4,385
Accumulated amortization	(12,456)	(5,326)	(4,385)
Net book value	68,274	52,774	0
Amortization of Intangible Assets	7,130	5,326	112
Adjustments to Core Deposits [Member]
Summary of core deposit intangibles and other intangibles
Additions during the period	22,630	58,100	0
Other Intangible Assets [Member]
Summary of core deposit intangibles and other intangibles
Gross carrying amount	44,887	44,931	34,572
Reductions due to sale	(217)	(43)	0
Accumulated amortization	(24,643)	(21,825)	(18,992)
Net book value	20,027	23,062	15,580
Additions during the period	0	10,359	2,162
Amortization of Intangible Assets	$ 2,818	$ 2,833	$ 1,847