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Fair Value - Additional information (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value Option Qualitative Disclosures Related To Election [Line Items]      
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 30 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 year 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).    
Loans held for sale, at fair value at December 31, 2020 $ 221,616,000 $ 18,008,000  
Individually Analyzed Financing Receivables, Provisional Expenses 2,900,000 12,000 $ 1,200,000
Mortgage Servicing Rights at Fair Value 13,153,000 273,000  
Valuation Allowance of Mortgage Servicing Rights 8,500,000 534,000  
Mortgage Servicing Rights Expense 8,000,000.0 234,000  
Proceeds from Collection of Loans Receivable     132,000
Real Estate Held-for-sale, Increase (Decrease) in Fair Value 0 264,000 $ 552,000
Residential Mortgage and Permanent Construction Loans [Member]      
Fair Value Option Qualitative Disclosures Related To Election [Line Items]      
Loans held for sale, at fair value at December 31, 2020   0  
Residential Mortgage Loans [Member]      
Fair Value Option Qualitative Disclosures Related To Election [Line Items]      
Loans held for sale, at fair value at December 31, 2020 98,600,000    
Loans held for sale, contractual balance 93,200,000    
Gain on sale of loans held for sale for the change in fair value 5,400,000    
Permanent Construction Loans [Member]      
Fair Value Option Qualitative Disclosures Related To Election [Line Items]      
Loans held for sale, at fair value at December 31, 2020 123,000,000.0    
Loans held for sale, contractual balance 109,500,000    
Gain on sale of loans held for sale for the change in fair value 13,500,000    
Collateral Dependent Loan [Member]      
Fair Value Option Qualitative Disclosures Related To Election [Line Items]      
Individually Analyzed Financing Receivable, Recorded Investment 11,700,000 106,000  
Individually Analyzed Financing Receivable, Related Allowance $ 2,900,000 $ 26,000  
Minimum [Member] | Real Estate Held For Sale      
Fair Value Option Qualitative Disclosures Related To Election [Line Items]      
Fair value input discount rate 0.00%    
Maximum [Member] | Real Estate Held For Sale      
Fair Value Option Qualitative Disclosures Related To Election [Line Items]      
Fair value input discount rate 30.00%