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Business Combination (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Apr. 01, 2019
Jul. 01, 2018
Business Acquisition [Line Items]              
Business Acquisition, Share Price           $ 3.80 $ 1.08
Business Combination, Consideration Transferred allocation percentage stock       6000.00%      
Business Combination, Consideration Transferred allocation percentage cash       4000.00%      
Stock Issued During Period, Shares, Acquisitions     1,037,205 435,457      
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable     $ 98,275,000 $ 48,519,000      
Payments to Acquire Businesses, Gross     28,630,000 30,684,000 $ 0    
Business Acquisition, Percentage of Voting Interests Acquired             91.45%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage             8.55%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain       3,500,000      
Goodwill, Acquired During Period     46,856,000 40,405,000      
Business Combination, Acquired Receivable, Fair Value           $ 578,577,000 $ 272,753,000
Business Combination, Acquired Receivables, Gross Contractual Amount           589,698,000 277,919,000
Goodwill, Translation and Purchase Accounting Adjustments   $ 58,000          
Core Deposits [Member]              
Business Acquisition [Line Items]              
Goodwill, Translation and Purchase Accounting Adjustments $ 2,000,000.0            
Other Assets [Member]              
Business Acquisition [Line Items]              
Goodwill, Translation and Purchase Accounting Adjustments 500,000            
Goodwill [Member]              
Business Acquisition [Line Items]              
Goodwill, Translation and Purchase Accounting Adjustments 1,600,000            
Performing Financial Instruments [Member]              
Business Acquisition [Line Items]              
Business Combination, Acquired Receivable, Fair Value           560,200,000 267,900,000
Business Combination, Acquired Receivables, Gross Contractual Amount           $ 572,600,000 $ 273,700,000
NewDominion [Member]              
Business Acquisition [Line Items]              
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed     87,000 4,600,000      
Goodwill, Acquired During Period       40,405,000      
Carolina Alliance [Member]              
Business Acquisition [Line Items]              
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed     8,800,000 $ 600,000      
Goodwill, Acquired During Period     46,856,000        
Business Combination, Acquired Receivables, Estimated Uncollectible $ 11,300,000   $ 11,300,000        
Common Stock [Member]              
Business Acquisition [Line Items]              
Stock Issued During Period, Shares, Acquisitions     1,037,205 435,457      
Common Stock [Member]              
Business Acquisition [Line Items]              
Business Acquisition, Share Price           $ 0.1378 $ 0.01023