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Fair Value Disclosures - Narrative (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Servicing rights carrying amount before valuation allowance $ 6,300 $ 6,600
Servicing rights valuation allowance 206 0
Other real estate owned 8,300 540
Held for Investment [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying value of individually analyzed loans and leases held for investment 29,800 38,100
Valuation allowance of individually analyzed loans and leases held for investment 1,100 2,100
Lease Financings [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying value of individually analyzed loans and leases held for investment $ 0 $ 277
Interest Rate Swap [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Number of loans with unrealized gain | loan 1  
Unrealized gain on loans $ 9