XML 77 R67.htm IDEA: XBRL DOCUMENT v3.20.2
Fair Value Measurements (Narrative) (Detail)
$ in Thousands
Sep. 30, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Restricted cash $ 136,700 $ 77,000
Available for sale debt securities: 1,100,391 976,919
Mortgage-Backed Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: 934,171 947,430
Measured on a Recurring Basis    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: 1,100,391 976,919
Measured on a Recurring Basis | Mortgage-Backed Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: 934,171 947,430
Quoted Prices in Active  Markets for Identical Assets (Level 1)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: 1,084 0
Quoted Prices in Active  Markets for Identical Assets (Level 1) | Mortgage-Backed Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: 0 0
Quoted Prices in Active  Markets for Identical Assets (Level 1) | Measured on a Recurring Basis    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: 1,084 0
Quoted Prices in Active  Markets for Identical Assets (Level 1) | Measured on a Recurring Basis | Mortgage-Backed Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: 0 0
Significant Other Observable  Inputs (Level 2)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: 1,099,307 976,919
Significant Other Observable  Inputs (Level 2) | Mortgage-Backed Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: 934,171 947,430
Significant Other Observable  Inputs (Level 2) | Measured on a Recurring Basis    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: 1,099,307 976,919
Significant Other Observable  Inputs (Level 2) | Measured on a Recurring Basis | Mortgage-Backed Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: 934,171 947,430
Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: 0 0
Significant Unobservable Inputs (Level 3) | Mortgage-Backed Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: 0 0
Significant Unobservable Inputs (Level 3) | Measured on a Recurring Basis    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: 0 0
Significant Unobservable Inputs (Level 3) | Measured on a Recurring Basis | Mortgage-Backed Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: 0 0
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: 1,100,391 976,919
Carrying Value | Mortgage-Backed Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: 934,171 947,430
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: 1,100,391 976,919
Fair Value | Mortgage-Backed Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities: $ 934,171 $ 947,430
Valuation, Market Approach | Measurement Input, Cost to Sell | Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Impaired loans, measurement input | security 0.05  
Foreclosed assets, measurement input | security 0.05  
Valuation, Market Approach | Measurement Input, Cost to Sell | Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Impaired loans, measurement input | security 0.10  
Foreclosed assets, measurement input | security 0.10