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Portfolio loans and allowance for credit losses- Distribution of portfolio loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Distributions of portfolio loans
Portfolio loans	$ 6,814,177	$ 6,687,249
Allowance for loan losses	(101,048)	(53,748)	$ (50,648)	$ (53,582)
Portfolio loans, net	6,713,129	6,633,501
Net deferred loan origination costs	2,400	6,200
Net accretable purchase accounting adjustments	10,900	20,200
Commercial Loans
Distributions of portfolio loans
Portfolio loans	2,014,576	1,748,368
Allowance for loan losses	(23,866)	(18,291)	(17,829)	(14,779)
Commercial Real Estate Loans
Distributions of portfolio loans
Portfolio loans	2,892,535	2,793,417
Allowance for loan losses	(46,230)	(21,190)	(21,137)	(21,813)
Real Estate Construction
Distributions of portfolio loans
Portfolio loans	461,786	401,861
Allowance for loan losses	(8,193)	(3,204)	(2,723)	(2,861)
Retail Real Estate
Distributions of portfolio loans
Portfolio loans	1,407,852	1,693,769
Allowance for loan losses	(21,992)	(10,495)	(8,471)	(13,783)
Retail Other
Distributions of portfolio loans
Portfolio loans	37,428	49,834
Allowance for loan losses	(767)	$ (568)	$ (488)	$ (346)
Paycheck Protection Program
Distributions of portfolio loans
Amortized cost of the loans outstanding	$ 446,400

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