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Fair Value Measurements (Assets and Liabilities) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: $ 1,100,391 $ 976,919  
Equity securities 869 825  
Derivative liabilities 135,500    
Foreclosed assets 4,720 2,715  
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  
Equity securities 869 825  
Derivative assets 0 0  
Derivative liabilities 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  
Equity securities 0 0  
Derivative assets 117,722 39,305  
Derivative liabilities 126,577 39,356  
Significant Unobservable Inputs (Level 3)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 0 0  
Equity securities 0 0  
Derivative assets 0 0  
Derivative liabilities 0 0  
Agency Obligations | 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
Agency Obligations | Significant Other Observable  Inputs (Level 2)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities:     0
Agency Obligations | Significant Unobservable Inputs (Level 3)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities:     0
Mortgage-Backed Securities      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 934,171 947,430  
Mortgage-Backed Securities | 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: 0 0  
Mortgage-Backed Securities | Significant Other Observable  Inputs (Level 2)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 934,171 947,430  
Mortgage-Backed Securities | Significant Unobservable Inputs (Level 3)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 0 0  
Asset-backed securities      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 53,868    
Asset-backed securities | Significant Other Observable  Inputs (Level 2)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 53,868    
State And Municipal Obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 70,518 4,079  
State And Municipal Obligations | 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: 0 0  
State And Municipal Obligations | Significant Other Observable  Inputs (Level 2)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 70,518 4,079  
State And Municipal Obligations | Significant Unobservable Inputs (Level 3)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 0 0  
Corporate Obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 40,750 25,410  
Corporate Obligations | 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: 0 0  
Corporate Obligations | Significant Other Observable  Inputs (Level 2)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 40,750 25,410  
Corporate Obligations | Significant Unobservable Inputs (Level 3)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 0 0  
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  
Equity securities 869 825  
Derivative assets 117,722 39,305  
Total assets at fair value 1,218,982 1,017,049  
Derivative liabilities 126,577 39,356  
Measured on a Recurring Basis | 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  
Equity securities 869 825  
Derivative assets 0 0  
Total assets at fair value 1,953 825  
Derivative liabilities 0 0  
Measured on a Recurring Basis | 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  
Equity securities 0 0  
Derivative assets 117,722 39,305  
Total assets at fair value 1,217,029 1,016,224  
Derivative liabilities 126,577 39,356  
Measured on a Recurring Basis | Significant Unobservable Inputs (Level 3)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 0 0  
Equity securities 0 0  
Derivative assets 0 0  
Total assets at fair value 0 0  
Derivative liabilities 0 0  
Measured on a Recurring Basis | Agency Obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities:     1,084
Measured on a Recurring Basis | Agency Obligations | 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
Measured on a Recurring Basis | Agency Obligations | Significant Other Observable  Inputs (Level 2)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities:     0
Measured on a Recurring Basis | Agency Obligations | Significant Unobservable Inputs (Level 3)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities:     $ 0
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  
Measured on a Recurring Basis | Mortgage-Backed Securities | 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: 0 0  
Measured on a Recurring Basis | Mortgage-Backed Securities | Significant Other Observable  Inputs (Level 2)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 934,171 947,430  
Measured on a Recurring Basis | Mortgage-Backed Securities | Significant Unobservable Inputs (Level 3)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 0 0  
Measured on a Recurring Basis | Asset-backed securities      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 53,868    
Measured on a Recurring Basis | Asset-backed securities | Significant Other Observable  Inputs (Level 2)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 53,868    
Measured on a Recurring Basis | State And Municipal Obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 70,518 4,079  
Measured on a Recurring Basis | State And Municipal Obligations | 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: 0 0  
Measured on a Recurring Basis | State And Municipal Obligations | Significant Other Observable  Inputs (Level 2)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 70,518 4,079  
Measured on a Recurring Basis | State And Municipal Obligations | Significant Unobservable Inputs (Level 3)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 0 0  
Measured on a Recurring Basis | Corporate Obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 40,750 25,410  
Measured on a Recurring Basis | Corporate Obligations | 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: 0 0  
Measured on a Recurring Basis | Corporate Obligations | Significant Other Observable  Inputs (Level 2)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 40,750 25,410  
Measured on a Recurring Basis | Corporate Obligations | Significant Unobservable Inputs (Level 3)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Available for sale debt securities: 0 0  
Measured on a Non-Recurring Basis      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total assets at fair value 22,718 23,118  
Loans measured for impairment based on the fair value of the underlying collateral 17,998 20,403  
Foreclosed assets 4,720 2,715  
Measured on a Non-Recurring Basis | Quoted Prices in Active  Markets for Identical Assets (Level 1)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total assets at fair value 0 0  
Loans measured for impairment based on the fair value of the underlying collateral 0 0  
Foreclosed assets 0 0  
Measured on a Non-Recurring Basis | Significant Other Observable  Inputs (Level 2)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total assets at fair value 0 0  
Loans measured for impairment based on the fair value of the underlying collateral 0 0  
Foreclosed assets 0 0  
Measured on a Non-Recurring Basis | Significant Unobservable Inputs (Level 3)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total assets at fair value 22,718 23,118  
Loans measured for impairment based on the fair value of the underlying collateral 17,998 20,403  
Foreclosed assets $ 4,720 $ 2,715