Fair Value of Financial Instruments (Financial instruments Measured at Fair Value) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale (amortized cost of $2,277,299 and $2,590,099, respectively)	$ 1,867,211	$ 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 (amortized cost of $2,277,299 and $2,590,099, respectively)	$ 0	$ 172,570
Government-sponsored enterprise securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale (amortized cost of $2,277,299 and $2,590,099, respectively)	60,127	60,266
Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale (amortized cost of $2,277,299 and $2,590,099, respectively)	1,789,243	1,937,784
Recurring | U.S. Treasuries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale (amortized cost of $2,277,299 and $2,590,099, respectively)		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 (amortized cost of $2,277,299 and $2,590,099, respectively)	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 (amortized cost of $2,277,299 and $2,590,099, respectively)		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 (amortized cost of $2,277,299 and $2,590,099, respectively)	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 (amortized cost of $2,277,299 and $2,590,099, respectively)	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 (amortized cost of $2,277,299 and $2,590,099, respectively)	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 (amortized cost of $2,277,299 and $2,590,099, respectively)	1,867,211	2,189,379
Derivative Assets	69	295
Presold mortgages in process of settlement	7,247	2,667
Derivative Liabilities	70	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 (amortized cost of $2,277,299 and $2,590,099, respectively)		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 (amortized cost of $2,277,299 and $2,590,099, respectively)	60,127	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 (amortized cost of $2,277,299 and $2,590,099, respectively)	1,789,243	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 (amortized cost of $2,277,299 and $2,590,099, respectively)	17,841	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 (amortized cost of $2,277,299 and $2,590,099, respectively)	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 (amortized cost of $2,277,299 and $2,590,099, respectively)		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 (amortized cost of $2,277,299 and $2,590,099, respectively)	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 (amortized cost of $2,277,299 and $2,590,099, respectively)	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 (amortized cost of $2,277,299 and $2,590,099, respectively)	0	0
Significant Unobservable Inputs (Level 3) | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	4,561	1,953
Estimated Fair Value | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale (amortized cost of $2,277,299 and $2,590,099, respectively)	1,867,211	2,189,379
Derivative Assets	69	295
Presold mortgages in process of settlement	7,247	2,667
Derivative Liabilities	70	349
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 (amortized cost of $2,277,299 and $2,590,099, respectively)	60,127	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 (amortized cost of $2,277,299 and $2,590,099, respectively)	1,789,243	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 (amortized cost of $2,277,299 and $2,590,099, respectively)	17,841	18,759
Estimated Fair Value | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Individually evaluated loans	$ 4,561	$ 1,953