Fair Value Measurements Quantitative Information about Level 3 Nonrecurring Assets (Details) $ in Thousands	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net		$ 6,388,297
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net		$ 6,388,297
Discount for costs to sell | Fair Value, Measurements, Nonrecurring | Minimum | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, measurement input	0.00	0.00
Discount for costs to sell | Fair Value, Measurements, Nonrecurring | Maximum | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, measurement input	0.09	0.07
Discount for costs to sell | Fair Value, Measurements, Nonrecurring | Weighted Average | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, measurement input	0.05	0.05
Appraisal adjustments | Fair Value, Measurements, Nonrecurring | Minimum | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, measurement input	0.00	0.00
Appraisal adjustments | Fair Value, Measurements, Nonrecurring | Maximum | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, measurement input	0.00	0.20
Appraisal adjustments | Fair Value, Measurements, Nonrecurring | Weighted Average | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans, measurement input	0.00	0.14
Substandard | Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net	$ 2,192	$ 1,778