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Fair Value of Financial Instruments (Financial instruments Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale $ 2,088,483 $ 2,189,379
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other liabilities Other liabilities
U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale $ 123,770 $ 172,570
Government-sponsored enterprise securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 59,959 60,266
Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 1,886,949 1,937,784
Recurring | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale   172,570
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Derivative Assets 0 0
Presold mortgages in process of settlement 0 0
Derivative Liabilities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring | Government-sponsored enterprise securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Individually evaluated loans 0 0
Significant Other Observable Inputs (Level 2) | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 2,088,483 2,189,379
Derivative Assets 0 295
Presold mortgages in process of settlement 6,703 2,667
Derivative Liabilities 30 349
Significant Other Observable Inputs (Level 2) | Recurring | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 123,770 172,570
Significant Other Observable Inputs (Level 2) | Recurring | Government-sponsored enterprise securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 59,959 60,266
Significant Other Observable Inputs (Level 2) | Recurring | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 1,886,949 1,937,784
Significant Other Observable Inputs (Level 2) | Recurring | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 17,805 18,759
Significant Other Observable Inputs (Level 2) | Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Individually evaluated loans 0 0
Significant Unobservable Inputs (Level 3) | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Derivative Assets 0 0
Presold mortgages in process of settlement 0 0
Derivative Liabilities 0 0
Significant Unobservable Inputs (Level 3) | Recurring | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Significant Unobservable Inputs (Level 3) | Recurring | Government-sponsored enterprise securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Significant Unobservable Inputs (Level 3) | Recurring | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Significant Unobservable Inputs (Level 3) | Recurring | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Significant Unobservable Inputs (Level 3) | Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Individually evaluated loans 4,638 1,953
Estimated Fair Value | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 2,088,483 2,189,379
Derivative Assets 0 295
Presold mortgages in process of settlement 6,703 2,667
Derivative Liabilities 30 349
Estimated Fair Value | Recurring | U.S. Treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 123,770  
Estimated Fair Value | Recurring | Government-sponsored enterprise securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 59,959 60,266
Estimated Fair Value | Recurring | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 1,886,949 1,937,784
Estimated Fair Value | Recurring | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 17,805 18,759
Estimated Fair Value | Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Individually evaluated loans $ 4,638 $ 1,953