Fair Value of Assets and Liabilities Quantitative Information about Level 3 Fair Value Measurements (Details) - Nonrecurring Measurements $ in Thousands		Dec. 31, 2019 USD ($) Input	Dec. 31, 2018 USD ($) Input
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned | $		$ 1,983	$ 1,011
Collateral-dependent impaired loans, net of ALLL | $		23	6,985
Level 3
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned | $		1,983	1,011
Collateral-dependent impaired loans, net of ALLL | $		23	6,985
Level 3 | Sales Comparison Approach
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned | $		1,983
Level 3 | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned | $			1,011
Collateral-dependent impaired loans, net of ALLL | $			2,384
Level 3 | Sales Comparison Approach | Adjustment to comparables
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL | $		14
Level 3 | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL | $		$ 9
Level 3 | Combined Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL | $			$ 4,601
Level 3 | Minimum Range | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned	[1]	0.060	0.080
Collateral-dependent impaired loans, net of ALLL		0	0.080	[1]
Level 3 | Minimum Range | Sales Comparison Approach | Adjustment to comparables
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned		0
Level 3 | Minimum Range | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL	[1]	0.100
Level 3 | Minimum Range | Combined Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL	[1]		0.100
Level 3 | Maximum Range | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned	[1]	0.100	0.150
Collateral-dependent impaired loans, net of ALLL		0	0.200	[1]
Level 3 | Maximum Range | Sales Comparison Approach | Adjustment to comparables
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned		0.111
Level 3 | Maximum Range | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL	[1]	0.100
Level 3 | Maximum Range | Combined Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL	[1]		0.100
Level 3 | Weighted Average Range | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned	[1]	0.073	0.092
Collateral-dependent impaired loans, net of ALLL		0	0.099	[1]
Level 3 | Weighted Average Range | Sales Comparison Approach | Adjustment to comparables
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned		0.045
Level 3 | Weighted Average Range | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL	[1]	0.100
Level 3 | Weighted Average Range | Combined Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL	[1]		0.100

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