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Loans and Allowance for Credit Losses - Information Pertaining to Impaired Loans Prior to Adoption of ASU 2016-13 (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Financing Receivable, Impaired [Line Items]  
Impaired Loans With a Valuation Allowance, Recorded Investment $ 308
Impaired Loans With a Valuation Allowance, Unpaid Principal 308
Impaired Loans With a Valuation Allowance, Related Allowance 13
Impaired Loans Without a Valuation Allowance, Recorded Investment 17,720
Impaired Loans Without a Valuation Allowance, Unpaid Principal 18,619
Commercial  
Financing Receivable, Impaired [Line Items]  
Impaired Loans With a Valuation Allowance, Recorded Investment 308
Impaired Loans With a Valuation Allowance, Unpaid Principal 308
Impaired Loans With a Valuation Allowance, Related Allowance 13
Impaired Loans Without a Valuation Allowance, Recorded Investment 7,478
Impaired Loans Without a Valuation Allowance, Unpaid Principal 8,287
Real estate construction one-to-four family  
Financing Receivable, Impaired [Line Items]  
Impaired Loans With a Valuation Allowance, Recorded Investment 0
Impaired Loans With a Valuation Allowance, Unpaid Principal 0
Impaired Loans With a Valuation Allowance, Related Allowance 0
Impaired Loans Without a Valuation Allowance, Recorded Investment 702
Impaired Loans Without a Valuation Allowance, Unpaid Principal 702
Real estate construction other  
Financing Receivable, Impaired [Line Items]  
Impaired Loans With a Valuation Allowance, Recorded Investment 0
Impaired Loans With a Valuation Allowance, Unpaid Principal 0
Impaired Loans With a Valuation Allowance, Related Allowance 0
Impaired Loans Without a Valuation Allowance, Recorded Investment 0
Impaired Loans Without a Valuation Allowance, Unpaid Principal 0
Real estate term owner occupied  
Financing Receivable, Impaired [Line Items]  
Impaired Loans With a Valuation Allowance, Recorded Investment 0
Impaired Loans With a Valuation Allowance, Unpaid Principal 0
Impaired Loans With a Valuation Allowance, Related Allowance 0
Impaired Loans Without a Valuation Allowance, Recorded Investment 6,962
Impaired Loans Without a Valuation Allowance, Unpaid Principal 7,047
Real estate term non-owner occupied  
Financing Receivable, Impaired [Line Items]  
Impaired Loans With a Valuation Allowance, Recorded Investment 0
Impaired Loans With a Valuation Allowance, Unpaid Principal 0
Impaired Loans With a Valuation Allowance, Related Allowance 0
Impaired Loans Without a Valuation Allowance, Recorded Investment 771
Impaired Loans Without a Valuation Allowance, Unpaid Principal 771
Real estate term other  
Financing Receivable, Impaired [Line Items]  
Impaired Loans With a Valuation Allowance, Recorded Investment 0
Impaired Loans With a Valuation Allowance, Unpaid Principal 0
Impaired Loans With a Valuation Allowance, Related Allowance 0
Impaired Loans Without a Valuation Allowance, Recorded Investment 1,467
Impaired Loans Without a Valuation Allowance, Unpaid Principal 1,467
Consumer secured by 1st deeds of trust  
Financing Receivable, Impaired [Line Items]  
Impaired Loans With a Valuation Allowance, Recorded Investment 0
Impaired Loans With a Valuation Allowance, Unpaid Principal 0
Impaired Loans With a Valuation Allowance, Related Allowance 0
Impaired Loans Without a Valuation Allowance, Recorded Investment 258
Impaired Loans Without a Valuation Allowance, Unpaid Principal 258
Consumer other  
Financing Receivable, Impaired [Line Items]  
Impaired Loans With a Valuation Allowance, Recorded Investment 0
Impaired Loans With a Valuation Allowance, Unpaid Principal 0
Impaired Loans With a Valuation Allowance, Related Allowance 0
Impaired Loans Without a Valuation Allowance, Recorded Investment 82
Impaired Loans Without a Valuation Allowance, Unpaid Principal $ 87