Qualified Affordable Housing Project Investments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]
Period of tax credits	10 years
Company's next investment in qualified affordable housing projects	$ 53,900,000	$ 39,400,000
Total unfunded commitments related to investments in qualified affordable housing funds	21,414,000	13,400,000
2020	9,776,000
2021	6,596,000
2022	3,806,000
2023	187,000
2024	182,000
Thereafter	867,000
Total unfunded commitments	21,414,000	13,400,000
Tax credit and other tax benefits recognized	6,506,000	4,748,000	$ 1,719,000
Amortization of investments	5,527,000	4,574,000	1,599,000
Impairment losses related to LIHTC investments	$ 0	$ 0	$ 0