Fair Value of Assets and Liabilities - Quantitative Information about Level 3 Fair Value Measurements (Details) - Non-Recurring Measurements $ in Thousands		Mar. 31, 2021 USD ($) Input		Dec. 31, 2020 USD ($) Input
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned | $				$ 564
Collateral-dependent impaired loans, net of ACL | $		$ 19,732		26,749
Level 3
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned | $				564
Collateral-dependent impaired loans, net of ACL | $		19,732		26,749
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
Collateral-dependent impaired loans, net of ACL | $		18,007		25,309
Level 3 | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ACL | $		$ 1,725		144
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 | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned	[1]			0.080
Collateral-dependent impaired loans, net of ALLL		0.100	[1]	0.100
Level 3 | Minimum | Sales Comparison Approach | Adjustments to comparables
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL		0.100		0.000
Level 3 | Minimum | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL	[1]	0.100		0.100
Level 3 | Minimum | Combined Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL				0.100
Level 3 | Minimum | Combined Approach | Measurement Input, Discount Rate
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL				0.080
Level 3 | Maximum | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned	[1]			0.100
Collateral-dependent impaired loans, net of ALLL		0.050	[1]	0.100
Level 3 | Maximum | Sales Comparison Approach | Adjustments to comparables
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL		0.050		1.000
Level 3 | Maximum | Cost Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL	[1]	0.100		0.100
Level 3 | Maximum | Combined Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL				0.100
Level 3 | Maximum | Combined Approach | Measurement Input, Discount Rate
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL				0.080
Level 3 | Weighted Average Range | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned	[1]			0.090
Collateral-dependent impaired loans, net of ALLL		0.051	[1]	0.001
Level 3 | Weighted Average Range | Sales Comparison Approach | Adjustments to comparables
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL		0.063		0.111
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		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				0.100
Level 3 | Weighted Average Range | Combined Approach | Measurement Input, Discount Rate
Quantitative Information About Level 3 Fair Value Measurements
Collateral-dependent impaired loans, net of ALLL				0.080

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