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Business Combinations Business Combinations (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jul. 01, 2018
Business Acquisition [Line Items]      
Business Combination, Acquired Receivable, Fair Value $ 272,800    
Business Acquisition, Share Price $ 3.80   $ 1.08
Business Combination, Consideration Transferred [Abstract]      
Payments to Acquire Businesses, Gross $ 30,684    
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable 48,519    
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value 7,000    
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Fair Value Method $ 86,203    
Business Acquisition, Percentage of Voting Interests Acquired 91.50%    
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage 8.60%    
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain $ 3,500    
Business Acquisition, Transaction Costs 3,600    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 42,954    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities 1,954    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 272,753   $ 272,753
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment [Abstract] 940    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets 6,133    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets 1,300    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities 284,231    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 332,283    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities 2,254    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 6,249    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities 286,485    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 45,798    
Business Acquisition, Pro Forma Information [Abstract]      
Business Acquisition, Pro Forma Net Income (Loss) $ 88,102 $ 62,775  
Business Acquisition, Pro Forma Earnings Per Share, Basic $ 5.61 $ 3.99  
Business Acquisition, Pro Forma Earnings Per Share, Diluted $ 5.51 $ 3.97  
Business Acquisition, Pro Forma Revenue $ 204,074 $ 190,461  
Business Combination, Acquired Receivables, Gross Contractual Amount $ 277,900   $ 277,900
Business Combination, Consideration Transferred allocation percentage stock 60.00%    
Business Combination, Consideration Transferred allocation percentage cash 40.00%    
Goodwill, Acquired During Period $ 40,405    
Common Stock [Member]      
Business Acquisition [Line Items]      
Business Acquisition, Share Price $ 0.1378   $ 0.01
Other Expense [Member]      
Business Combination, Consideration Transferred [Abstract]      
Business Acquisition, Transaction Costs $ 200    
Employee benefits [Member]      
Business Combination, Consideration Transferred [Abstract]      
Business Acquisition, Transaction Costs 100    
Salaries [Member]      
Business Combination, Consideration Transferred [Abstract]      
Business Acquisition, Transaction Costs 1,600    
Professional fees and services [Member]      
Business Combination, Consideration Transferred [Abstract]      
Business Acquisition, Transaction Costs 1,800    
Commercial, Financial, and Agricultural [Member]      
Business Acquisition [Line Items]      
Business Combination, Acquired Receivable, Fair Value 19,100    
Business Acquisition, Pro Forma Information [Abstract]      
Business Combination, Acquired Receivables, Gross Contractual Amount 19,200    
Commercial Real Estate [Member]      
Business Acquisition [Line Items]      
Business Combination, Acquired Receivable, Fair Value 117,600    
Business Acquisition, Pro Forma Information [Abstract]      
Business Combination, Acquired Receivables, Gross Contractual Amount 119,400    
Construction Real Estate Commercial [Domain]      
Business Acquisition [Line Items]      
Business Combination, Acquired Receivable, Fair Value 22,200    
Business Acquisition, Pro Forma Information [Abstract]      
Business Combination, Acquired Receivables, Gross Contractual Amount 22,500    
Construction Real Estate - Mortgage [Member]      
Business Acquisition [Line Items]      
Business Combination, Acquired Receivable, Fair Value 8,100    
Business Acquisition, Pro Forma Information [Abstract]      
Business Combination, Acquired Receivables, Gross Contractual Amount 8,400    
Residential Real Estate Commercial [Member]      
Business Acquisition [Line Items]      
Business Combination, Acquired Receivable, Fair Value 14,800    
Business Acquisition, Pro Forma Information [Abstract]      
Business Combination, Acquired Receivables, Gross Contractual Amount 14,800    
Residential Real Estate - Mortgage [Member]      
Business Acquisition [Line Items]      
Business Combination, Acquired Receivable, Fair Value 48,700    
Business Acquisition, Pro Forma Information [Abstract]      
Business Combination, Acquired Receivables, Gross Contractual Amount 50,300    
Residential Real Estate Home Equity Line Of Credit [Member]      
Business Acquisition [Line Items]      
Business Combination, Acquired Receivable, Fair Value 36,700    
Business Acquisition, Pro Forma Information [Abstract]      
Business Combination, Acquired Receivables, Gross Contractual Amount 37,700    
Consumer Loan [Member]      
Business Acquisition [Line Items]      
Business Combination, Acquired Receivable, Fair Value 500    
Business Acquisition, Pro Forma Information [Abstract]      
Business Combination, Acquired Receivables, Gross Contractual Amount 500    
Purchased credit impaired [Member]      
Business Acquisition [Line Items]      
Business Combination, Acquired Receivable, Fair Value 4,900    
Business Acquisition, Pro Forma Information [Abstract]      
Business Combination, Acquired Receivables, Gross Contractual Amount $ 5,100    
Performing Financial Instruments [Member]      
Business Acquisition [Line Items]      
Business Combination, Acquired Receivable, Fair Value     $ 267,900
Business Acquisition, Pro Forma Information [Abstract]      
Business Combination, Acquired Receivables, Gross Contractual Amount     $ 272,900