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Fair Value (Financial instruments Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale $ 2,305,075 $ 1,453,132
Foreclosed properties 1,819 2,424
Government-sponsored enterprise securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 68,608 70,206
Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 2,191,530 1,337,706
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
Presold mortgages in process of settlement 16,746 42,271
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
Foreclosed properties 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 2,305,075 1,453,132
Presold mortgages in process of settlement 0 0
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 68,608 70,206
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 2,191,530 1,337,706
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 44,937 45,220
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
Foreclosed properties 0 0
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Individually evaluated loans 7,973 16,000
Foreclosed properties 462 1,484
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
Presold mortgages in process of settlement 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 12,279 22,142
Foreclosed properties 462 1,484
Estimated Fair Value | Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 2,305,075 1,453,132
Presold mortgages in process of settlement 16,746 42,271
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 68,608 70,206
Estimated Fair Value | Recurring | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 2,191,530 1,337,706
Estimated Fair Value | Recurring | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 44,937 45,220
Estimated Fair Value | Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Individually evaluated loans 12,279 22,142
Foreclosed properties $ 462 $ 1,484