XML 146 R129.htm IDEA: XBRL DOCUMENT v3.20.4
Fair Value - Quantitative Information about Significant Unobservable Inputs Used in Fair Value Measurements (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 5,970,115 $ 5,385,091
Percentage of adjusted specific issuer evaluation defaults 100.00%  
Pooled trust preferred securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Percentage of adjusted specific issuer evaluation recoveries 100.00%  
Pooled trust preferred securities | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Percentage of adjusted specific issuer evaluation defaults 0.00%  
Percentage of adjusted specific issuer evaluation recoveries 0.00%  
Pooled trust preferred securities | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Percentage of adjusted specific issuer evaluation defaults 50.00%  
Percentage of adjusted specific issuer evaluation recoveries 25.00%  
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 7,913 $ 8,222
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Constant Prepayment Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.000 0.000
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Minimum | Additional Asset Defaults    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.060 0.062
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Minimum | Expected Asset Recoveries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.000 0.000
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Maximum | Additional Asset Defaults    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.087 0.080
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Maximum | Expected Asset Recoveries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.232 0.191
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Weighted Average | Additional Asset Defaults    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.068 0.068
Significant Unobservable Inputs (Level 3) | Pooled trust preferred securities | Weighted Average | Expected Asset Recoveries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.073 0.060
Significant Unobservable Inputs (Level 3) | States and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   $ 40
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 10,747 $ 10,361
Number of loans | loan   1
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 40,653 $ 11,610
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Discount for Type of Property, Age of Appraisal, and Current Status | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input   0.45
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Minimum | Discount for Type of Property, Age of Appraisal, and Current Status | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0 0
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Minimum | Discount for Type of Property, Age of Appraisal, and Current Status | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0  
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Maximum | Discount for Type of Property, Age of Appraisal, and Current Status | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.33 0.50
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Maximum | Discount for Type of Property, Age of Appraisal, and Current Status | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.18  
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Weighted Average | Discount for Type of Property, Age of Appraisal, and Current Status | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.12 0.13
Significant Unobservable Inputs (Level 3) | Collateral Dependent Loans | Weighted Average | Discount for Type of Property, Age of Appraisal, and Current Status | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input 0.07  
Significant Unobservable Inputs (Level 3) | Foreclosed Assets | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   $ 21
Number of loans | loan   1
Significant Unobservable Inputs (Level 3) | Foreclosed Assets | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value   $ 22
Number of loans | loan   1
Significant Unobservable Inputs (Level 3) | Foreclosed Assets | Discount for Type of Property, Age of Appraisal, and Current Status | Commercial real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input   0.43
Significant Unobservable Inputs (Level 3) | Foreclosed Assets | Discount for Type of Property, Age of Appraisal, and Current Status | Residential real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input   0.21