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Fair Value - Additional information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Fair Value Option Quantitative Disclosures [Line Items]      
Loans held for sale, fair value disclosure $ 208,054,000 $ 208,054,000  
Fair value determination of loans held for sale description   The fair value of conventional loans held for sale is determined using the current 15 day forward contract price for either 15 or year conventional mortgages (Level 2). The fair value of permanent construction loans held for sale is determined using the current 60 day forward contract price for 15 or 30 years conventional mortgages which is then adjusted for unobservable market data such as estimated fall out rates and estimated time from origination to completion of construction (Level 3).  
Minimum [Member] | Real Estate held for sale [Member]      
Fair Value Option Quantitative Disclosures [Line Items]      
Fair Value Input Discount Rate   0.00%  
Maximum [Member] | Real Estate held for sale [Member]      
Fair Value Option Quantitative Disclosures [Line Items]      
Fair Value Input Discount Rate   30.00%  
Permanent Construction Loans [Member]      
Fair Value Option Quantitative Disclosures [Line Items]      
Loans held for sale, fair value disclosure 112,000,000.0 $ 112,000,000.0  
Loans held for sale, contractual balance 100,800,000 100,800,000  
Gain on sale of loans held for sale for the change in fair value 4,000,000.0 11,200,000  
Residential Mortgage and Permanent Construction Loans [Member]      
Fair Value Option Quantitative Disclosures [Line Items]      
Loans held for sale, fair value disclosure     $ 0
Residential Mortgage Loans [Member]      
Fair Value Option Quantitative Disclosures [Line Items]      
Loans held for sale, fair value disclosure 96,100,000 96,100,000  
Loans held for sale, contractual balance 90,800,000 90,800,000  
Gain on sale of loans held for sale for the change in fair value $ 900,000 $ 5,200,000