Mortgage Servicing Rights (Details) - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Mortgage servicing rights [Roll Forward]
Mortgage servicing rights at beginning of the period	$ 282,000	$ 109,000
Additions	8,936,000	225,000
Amortization	(754,000)	(68,000)
Sales	0	0
Mortgage servicing rights at end of the period	8,464,000	266,000
Valuation allowance at end of period	(42,000)	(99,000)
Mortgage servicing rights at end of the period, net	8,422,000	167,000
Fair value of mortgage servicing rights	9.9	180,000
Estimated future servicing rights amortization expense by period [Abstract]
2020	596,000
2021	2,609,000
2022	1,550,000
2023	1,374,000
2024	940,000
Thereafter	1,353,000
Total	8,422,000
MSR Sales [Abstract]
Loans originated for sale	3,060,000,000.00
Sales of loans held for sale	3,070,000,000.00
Generated mortgage banking income	166,300,000
Loans sold on a servicing retained basis	1,240,000,000		$ 64,900,000
Sold mortgage servicing rights	$ 0	$ 0