Fair Value Measurements - Significant Unobservable Inputs (Details) - Trust preferred securities $ in Thousands	Dec. 31, 2018 USD ($)
Significant unobservable inputs (Level 3) used in the valuation of assets and liabilities measured at fair value on a recurring basis
Fair Value	$ 10,633
Measurement Input, Price Volatility | Minimum
Significant unobservable inputs (Level 3) used in the valuation of assets and liabilities measured at fair value on a recurring basis
Measurement input	0.00
Measurement Input, Price Volatility | Maximum
Significant unobservable inputs (Level 3) used in the valuation of assets and liabilities measured at fair value on a recurring basis
Measurement input	1.00