Quantitative Information about Level 3 Fair Value Measurements (Details) - Non-Recurring Measurements $ in Thousands		Mar. 31, 2019 USD ($) Input	Dec. 31, 2018 USD ($) Input
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned | $		$ 204	$ 1,011
Collateral-dependent impaired loans, net of ALLL | $		8	6,985
Level 3
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned | $		204	1,011
Collateral-dependent impaired loans, net of ALLL | $		8	6,985
Level 3 | Sales Comparison Approach | Selling costs
Quantitative Information About Level 3 Fair Value Measurements
Other real estate owned | $		204	1,011
Collateral-dependent impaired loans, net of ALLL | $		$ 8	2,384
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]	0.080	0.080
Collateral-dependent impaired loans, net of ALLL	[1]	0.100	0.080
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]	0.150	0.150
Collateral-dependent impaired loans, net of ALLL	[1]	0.100	0.200
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]	0.106	0.092
Collateral-dependent impaired loans, net of ALLL	[1]	0.100	0.099
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.