Loan Servicing Activity of MSRs and the related valuation allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Servicing Asset at Amortized Cost, Beginning Balance	$ 10,070	$ 10,178	$ 9,688
Servicing Asset at Amortized Cost, Additions	8,627	2,355	1,591
Servicing Asset at Amortized Cost, Amortization	4,123	1,870	1,499
Servicing Asset at Amortized Cost, Increase (Decrease) for Valuation Allowance Adjustment	(2,364)	(593)	398
Servicing Asset at Amortized Cost, Ending Balance	12,210	10,070	10,178
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance, Beginning Balance	825	232	630
Valuation Allowance for Impairment of Recognized Servicing Assets, Additions (Deductions) for Expenses (Recoveries)	2,364	593	(398)
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance, Ending Balance	$ 3,189	$ 825	$ 232