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Portfolio Loans- Distribution of portfolio loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Distributions of portfolio loans
Portfolio loans	$ 7,150,635		$ 6,814,177
ACL	(92,802)	$ (95,410)	(101,048)	$ (98,841)	$ (96,046)	$ (53,748)
Portfolio loans, net	7,057,833		6,713,129
Commercial Loans
Distributions of portfolio loans
Portfolio loans	1,931,863		2,014,576
ACL	(24,406)	(24,356)	(23,866)	(24,363)	(24,146)	(18,291)
Commercial Real Estate Loans
Distributions of portfolio loans
Portfolio loans	3,068,622		2,892,535
ACL	(39,831)	(39,974)	(46,230)	(45,917)	(42,680)	(21,190)
Real Estate Construction
Distributions of portfolio loans
Portfolio loans	430,857		461,786
ACL	(6,121)	(7,599)	(8,193)	(7,419)	(7,792)	(3,204)
Retail Real Estate
Distributions of portfolio loans
Portfolio loans	1,512,884		1,407,852
ACL	(19,352)	(20,505)	(21,992)	(20,184)	(20,405)	(10,495)
Retail Other
Distributions of portfolio loans
Portfolio loans	206,409		37,428
ACL	$ (3,092)	$ (2,976)	$ (767)	$ (958)	$ (1,023)	$ (568)

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