Fair Value Measurements and Disclosure - Valuation Technique, Unobservable Input, and Qualitative Information (Details) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018 USD ($)
Fair value, measurements, nonrecurring | Mortgages
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate mortgage		$ 389
Fair value, measurements, nonrecurring | Mortgages | Significant Unobservable Inputs (Level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate mortgage		389
Fair value, measurements, nonrecurring | Mortgages | Fair Value of Collateral Method for Collateral Dependent Loans | Significant Unobservable Inputs (Level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate mortgage		$ 389
Measurement input, discount rate | Weighted average | Significant Unobservable Inputs (Level 3) | Junior Subordinated Debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average inputs (percent)	0.0488
Measurement input, discount rate | Fair value, measurements, recurring | Weighted average | Significant Unobservable Inputs (Level 3) | Junior Subordinated Debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average inputs (percent)	0.0488	0.0586
Adjustment percentage | Fair value, measurements, nonrecurring | Mortgages | Fair Value of Collateral Method for Collateral Dependent Loans | Significant Unobservable Inputs (Level 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate mortgage, adjustment percentage		0.0943