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Fair Value of Financial Instruments - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Servicing asset at fair value, gain (loss) on disposal $ 410,000      
Mortgage servicing rights assets recognized or recorded during period 0 $ 149,000    
Carrying value MSR assets 0 $ 18,261,000 $ 15,637,000 $ 20,824,000
Non-marketable equity securities held in other financial institutions 53,870,000   55,190,000  
Impairment recorded on investments in equity securities that do not have readily determinable fair values 0      
Loan balance individually evaluated 14,731,000   5,011,000  
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Nonrecurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loan balance individually evaluated 3,900,000   3,800,000  
Foreclosed assets 3,900,000   3,900,000  
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Nonrecurring | Real estate | Residential real estate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Residential mortgage loans in the process of foreclosure $ 944,000   $ 0  
Minimum | Measurement Input, Credit Spread        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Credit spread, securities at fair value through income 0.83%   0.83%  
Maximum | Measurement Input, Credit Spread        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Credit spread, securities at fair value through income 2.27%   2.27%