Fair Value Measurement and Fair Value of Financial Instruments (Quantitative Information for Significant Unobservable Inputs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2016
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Warrants
Quantitative information
Derivative assets - Fair value	$ 679	$ 673	$ 0
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans
Quantitative information
Non-PCI, impaired loans	38,188	32,858
Fair Value, Measurements, Nonrecurring | OREO nonrecurring fair value losses
Quantitative information
OREO	9
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans
Quantitative information
Non-PCI, impaired loans	38,188	32,858
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Discounted cash flows
Quantitative information
Non-PCI, impaired loans	22,802	16,921
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Fair value of property
Quantitative information
Non-PCI, impaired loans	9,773	1,687
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Valuation Technique, Fair Value Of Collateral, Discount
Quantitative information
Non-PCI, impaired loans	3,207	2,751
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Valuation Technique, Fair Value Of Collateral, Contract Value
Quantitative information
Non-PCI, impaired loans	2,406	$ 11,499
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | OREO nonrecurring fair value losses
Quantitative information
OREO	9
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | OREO nonrecurring fair value losses | Fair value of property
Quantitative information
OREO	$ 9
Volatility | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Warrants | Black-Scholes option pricing model | Minimum
Quantitative information
Measurement input		49.00%
Volatility | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Warrants | Black-Scholes option pricing model | Maximum
Quantitative information
Measurement input		52.00%
Volatility | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Warrants | Black-Scholes option pricing model | Weighted Average
Quantitative information
Measurement input		51.00%
Liquidity discount | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Warrants | Black-Scholes option pricing model
Quantitative information
Measurement input		47.00%
Liquidity discount | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Warrants | Black-Scholes option pricing model | Weighted Average
Quantitative information
Measurement input		47.00%
Discount | Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Discounted cash flows | Minimum
Quantitative information
Non-PCI impaired loans, measurement input	4.00%	4.00%
Discount | Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Discounted cash flows | Maximum
Quantitative information
Non-PCI impaired loans, measurement input	10.00%	7.00%
Discount | Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Discounted cash flows | Weighted Average
Quantitative information
Non-PCI impaired loans, measurement input	6.00%	6.00%
Discount | Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Valuation Technique, Fair Value Of Collateral, Discount | Minimum
Quantitative information
Non-PCI impaired loans, measurement input	20.00%	15.00%
Discount | Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Valuation Technique, Fair Value Of Collateral, Discount | Maximum
Quantitative information
Non-PCI impaired loans, measurement input	32.00%	50.00%
Discount | Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Valuation Technique, Fair Value Of Collateral, Discount | Weighted Average
Quantitative information
Non-PCI impaired loans, measurement input	29.00%	21.00%
Selling cost | Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Fair value of property
Quantitative information
Non-PCI impaired loans, measurement input	8.00%	8.00%
Selling cost | Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Fair value of property | Weighted Average
Quantitative information
Non-PCI impaired loans, measurement input	8.00%	8.00%
Selling cost | Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | OREO nonrecurring fair value losses | Fair value of property
Quantitative information
OREO, measurement input	8.00%
Selling cost | Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | OREO nonrecurring fair value losses | Fair value of property | Weighted Average
Quantitative information
OREO, measurement input	8.00%