Loans - Nonaccrual loans prior to Adoption of ASU 2016-13 (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Loans
Nonaccrual loans	$ 110,894	$ 33,141
Other income producing property
Loans
Nonaccrual loans	8,124	1,947
Commercial loans | Construction and land development
Loans
Nonaccrual loans	1,645	1,193
Commercial loans | Commercial non-owner occupied
Loans
Nonaccrual loans	7,047	1,154
Commercial loans | Commercial owner occupied real estate loan
Loans
Nonaccrual loans	30,813	4,385
Commercial loans | Commercial and industrial
Loans
Nonaccrual loans	12,724	6,913
Consumer | Consumer Owner Occupied Loans
Loans
Nonaccrual loans	33,097	9,718
Consumer | Home equity loans
Loans
Nonaccrual loans	11,430	4,640
Consumer | Consumer
Loans
Nonaccrual loans	$ 6,014	3,191
Non-acquired loans
Loans
Nonaccrual loans		22,302	$ 18,854
Non-acquired loans | Other income producing property
Loans
Nonaccrual loans		798	628
Non-acquired loans | Restructured loans
Loans
Nonaccrual loans		2,578	544
Non-acquired loans | Commercial loans | Construction and land development
Loans
Nonaccrual loans		363	412
Non-acquired loans | Commercial loans | Commercial non-owner occupied
Loans
Nonaccrual loans		732	457
Non-acquired loans | Commercial loans | Commercial non-owner occupied real estate
Loans
Nonaccrual loans		1,095	869
Non-acquired loans | Commercial loans | Commercial owner occupied real estate loan
Loans
Nonaccrual loans		3,482	4,062
Non-acquired loans | Commercial loans | Commercial and industrial
Loans
Nonaccrual loans		4,092	2,565
Non-acquired loans | Consumer | Consumer Owner Occupied Loans
Loans
Nonaccrual loans		7,202	7,374
Non-acquired loans | Consumer | Home equity loans
Loans
Nonaccrual loans		1,468	1,273
Non-acquired loans | Consumer | Real estate
Loans
Nonaccrual loans		8,670	8,647
Non-acquired loans | Consumer | Consumer
Loans
Nonaccrual loans		1,587	1,539
Acquired non-credit impaired loans
Loans
Nonaccrual loans		10,839	9,596
Acquired non-credit impaired loans | Other income producing property
Loans
Nonaccrual loans		1,101	270
Acquired non-credit impaired loans | Commercial loans | Construction and land development
Loans
Nonaccrual loans		699	1,031
Acquired non-credit impaired loans | Commercial loans | Commercial non-owner occupied
Loans
Nonaccrual loans		393	266
Acquired non-credit impaired loans | Commercial loans | Commercial non-owner occupied real estate
Loans
Nonaccrual loans		1,092	1,297
Acquired non-credit impaired loans | Commercial loans | Commercial owner occupied real estate loan
Loans
Nonaccrual loans		903	933
Acquired non-credit impaired loans | Commercial loans | Commercial and industrial
Loans
Nonaccrual loans		722	692
Acquired non-credit impaired loans | Consumer | Consumer Owner Occupied Loans
Loans
Nonaccrual loans		2,350	1,739
Acquired non-credit impaired loans | Consumer | Home equity loans
Loans
Nonaccrual loans		3,067	3,034
Acquired non-credit impaired loans | Consumer | Real estate
Loans
Nonaccrual loans		5,417	4,773
Acquired non-credit impaired loans | Consumer | Consumer
Loans
Nonaccrual loans		$ 1,604	$ 1,631