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Fair Value Measurements - Nonrecurring (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Assets and liabilities measured at fair value    
Valuation allowance $ 24,700,000  
Carrying value of other real estate owned 761,000 $ 1,561,000
Impaired Loans [Member]    
Assets and liabilities measured at fair value    
Valuation allowance   65,300,000
Impaired Loans [Member] | Reported Value Measurement [Member]    
Assets and liabilities measured at fair value    
Increase (decrease) of specific allocations within the provision for loan losses   12,200,000
Fair Value, Measurements, Nonrecurring [Member]    
Assets and liabilities measured at fair value    
Total 57,122,000 49,261,000
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member]    
Assets and liabilities measured at fair value    
Total 56,361,000 47,700,000
Valuation allowance 24,700,000 17,600,000
Increase (decrease) of specific allocations within the provision for loan losses 7,100,000  
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Reported Value Measurement [Member]    
Assets and liabilities measured at fair value    
Total 81,100,000  
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned [Member]    
Assets and liabilities measured at fair value    
Total 761,000 1,561,000
Carrying value of other real estate owned 761,000 1,600,000
Outstanding balance 1,000,000.0 2,500,000
OREO Valuation allowance 114,000 856,000
OREO participations 130,000 131,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets and liabilities measured at fair value    
Total 57,122,000 49,261,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]    
Assets and liabilities measured at fair value    
Total 56,361,000 47,700,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]    
Assets and liabilities measured at fair value    
Total $ 761,000 $ 1,561,000