Regulatory & Capital Matters (Details)	3 Months Ended	9 Months Ended
	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jan. 01, 2020 USD ($)	Dec. 31, 2019
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)		10.07		11.93
Risk-based capital ratio (as a percent)		14.33		14.53
Payments of Dividends	$ 30,000,000.0
Phase out of impact of allowance for credit loss			$ 3,800,000
Deferment of impact on rretained earnings		$ 5,700,000
Percentage of allowance for credit loss		25.00%
Change in allowance for credit loss		$ 10,400,000
Subsidiaries [Member]
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)		10.90		12.50
Risk-based capital ratio (as a percent)		15.49		15.23
Tier One leverage ratio, basis point decrease (as a percent)		1.60%
Risk-based capital ratio, basis point decrease (as a percent)		$ 0.26
Minimum [Member] | Subsidiaries [Member]
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)		8
Risk-based capital ratio (as a percent)		12
Tier 1 capital leverage ratio, board-designated threshold		8.00%
Total Capital Ratio, board-designated threshold (as a percent)		12.00%