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Portfolio loans - Distribution of portfolio loans (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended	12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Distributions of portfolio loans
Portfolio loans	$ 7,121,311			$ 7,121,311	$ 6,687,249
Allowance for loan losses	(98,841)	$ (96,046)		(98,841)	(53,748)	$ (52,965)	$ (51,375)	$ (50,648)
Portfolio loans, net	7,022,470			7,022,470	6,633,501
Net deferred loan origination costs	6,000			6,000	6,200
Net accretable purchase accounting adjustments				13,200	20,200
Commercial Loans
Distributions of portfolio loans
Portfolio loans	2,281,031			2,281,031	1,748,368
Allowance for loan losses	(24,363)	(24,146)		(24,363)	(18,291)	(16,526)	(16,733)	(17,829)
Commercial Real Estate Loans
Distributions of portfolio loans
Portfolio loans	2,912,408			2,912,408	2,793,417
Allowance for loan losses	(45,917)	(42,680)		(45,917)	(21,190)	(22,220)	(20,188)	(21,137)
Real Estate Construction
Distributions of portfolio loans
Portfolio loans	407,266			407,266	401,861
Allowance for loan losses	(7,419)	(7,792)		(7,419)	(3,204)	(3,110)	(3,305)	(2,723)
Retail Real Estate
Distributions of portfolio loans
Portfolio loans	1,480,520			1,480,520	1,693,769
Allowance for loan losses	(20,184)	(20,405)		(20,184)	(10,495)	(10,522)	(10,613)	(8,471)
Loans purchased	0	0	$ 43,900
Retail Other
Distributions of portfolio loans
Portfolio loans	40,086			40,086	49,834
Allowance for loan losses	(958)	$ (1,023)		(958)	$ (568)	$ (587)	$ (536)	$ (488)
Paycheck Protection Program
Distributions of portfolio loans
Amortized cost of the loans outstanding	$ 736,400			$ 736,400

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