Fair Value of Assets and Liabilities - Quantitative Information about Level 3 Fair Value Measurements (Details) - Nonrecurring Measurements $ in Thousands		Dec. 31, 2020 USD ($) Input		Jun. 30, 2020 USD ($) Input	Dec. 31, 2019 USD ($) Input
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned | $		$ 564			$ 1,983
Collateral-dependent impaired loans, net of ACL | $		26,749			23
Level 3
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned | $		564			1,983
Collateral-dependent impaired loans, net of ACL | $		26,749			23
Level 3 | Sales Comparison Approach
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned | $		564
Level 3 | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned | $					1,983
Collateral-dependent impaired loans, net of ACL | $		25,309
Level 3 | Sales Comparison Approach | Adjustment to comparables
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ACL | $					$ 14
Level 3 | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ACL | $		144		$ 9
Level 3 | Combined Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ACL | $		$ 1,296
Level 3 | Minimum Range | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned, measurement input	[1]	0.080			0.060
Impaired loans, measurement input		0.100
Level 3 | Minimum Range | Sales Comparison Approach | Adjustment to comparables
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input		0.000			0.000	[1]
Level 3 | Minimum Range | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input		0.100	[1]	0.100
Level 3 | Minimum Range | Combined Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input		0.100
Level 3 | Minimum Range | Combined Approach | Discount rate
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input		0.080
Level 3 | Maximum Range | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned, measurement input	[1]	0.100			0.100
Impaired loans, measurement input		0.100
Level 3 | Maximum Range | Sales Comparison Approach | Adjustment to comparables
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input		1.000			0.000	[1]
Level 3 | Maximum Range | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input		0.100	[1]	0.100
Level 3 | Maximum Range | Combined Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input		0.100
Level 3 | Maximum Range | Combined Approach | Discount rate
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input		0.080
Level 3 | Weighted Average Range | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned, measurement input	[1]	0.090			0.073
Impaired loans, measurement input		0.001
Level 3 | Weighted Average Range | Sales Comparison Approach | Adjustment to comparables
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input		0.111			0.000	[1]
Level 3 | Weighted Average Range | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input		0.100	[1]	0.100
Level 3 | Weighted Average Range | Combined Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input		0.100
Level 3 | Weighted Average Range | Combined Approach | Discount rate
Quantitative Information About Level 3 Fair Value Measurements
Impaired loans, measurement input		0.080

[1] The range for selling cost inputs represents reductions to the fair value of the assets.