Fair Value Measurements and Disclosure - Valuation Technique, Unobservable Input, and Qualitative Information (Details) $ in Thousands	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Fair value, measurements, nonrecurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate mortgage	$ 1,008
Fair value, measurements, nonrecurring | Real estate mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate mortgage		$ 389
Significant Unobservable Inputs (Level 3) | Discount rate | Weighted average | Junior Subordinated Debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average inputs (percent)	0.0451
Significant Unobservable Inputs (Level 3) | Fair value, measurements, recurring | Discounted cash flow | Discount rate | Weighted average | Junior Subordinated Debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average inputs (percent)	0.0451	0.0586
Significant Unobservable Inputs (Level 3) | Fair value, measurements, nonrecurring | Real estate mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate mortgage		$ 389
Significant Unobservable Inputs (Level 3) | Fair value, measurements, nonrecurring | Fair Value of Collateral Method for Collateral Dependent Loans | Real estate mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate mortgage	$ 1,008
Significant Unobservable Inputs (Level 3) | Fair value, measurements, nonrecurring | Fair Value of Collateral Method for Collateral Dependent Loans | Adjustment Percentage | Real estate mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Real estate mortgage		$ 389
Real estate mortgage, adjustment percentage	0.0104	0.0943