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Investment Securities - Textual (Details) - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Total investment securities $ 684,647,000   $ 673,434,000
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0
Debt Securities, Held-to-maturity, Allowance for Credit Loss 0    
Debt Securities, Trading, and Equity Securities, FV-NI 0   $ 0
Debt Securities, Available-for-Sale, Accrued Interest Writeoff 0 $ 0  
Debt Securities, Held-to-Maturity, Accrued Interest, Writeoff $ 0 $ 0  
Concentration, debt securities 0.00%   0.00%
Investment securities held to maturity, at amortized cost, net (fair value of $684,647 and $673,434, respectively) $ 760,163,000   $ 766,396,000
Debt Securities, Held-to-maturity, Nonaccrual 0   0
Debt Securities, Held-to-maturity, 90 Days or More Past Due, Still Accruing 0   0
Total investment securities available for sale 1,318,072,000   $ 1,331,443,000
Gain (Loss) on Disposition of Stock in Subsidiary $ 1,600,000    
Common Stock, Shares, Outstanding 35,108,120   35,106,697
Common Class B      
Common Stock, Shares, Outstanding     6,549
Common Stock, Value, Outstanding     $ 0
Available-for-sale Securities [Member]      
Accrued Investment Income Receivable $ 4,300,000   4,800,000
Held-to-maturity Securities      
Accrued Investment Income Receivable $ 2,300,000   $ 2,400,000