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Investments - Revenue and General Obligation Bonds (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
item
state
Dec. 31, 2023
USD ($)
item
state
Debt Securities, Available-for-sale [Line Items]    
Number of municipal bond | item 227 485
Investment securities available for sale $ 741,789 $ 1,019,201
States and Political Subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Number of municipalities and agencies | item 191 398
Number of states | state 28 36
Fair market value (available-for-sale securities and held-to-maturity securities) $ 219,810 $ 372,371
Investment securities available for sale 44,675 194,206
General Obligation Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair market value (available-for-sale securities and held-to-maturity securities) 194,620 324,643
General Obligation Bonds [Member] | City of New York [Member]    
Debt Securities, Available-for-sale [Line Items]    
Investment securities available for sale 5,300 5,300
Subordinate Debenture [Member]    
Debt Securities, Available-for-sale [Line Items]    
Investment securities available for sale $ 54,700 $ 52,000
Number of subordinated debentures owned | item 51 51