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Fair Value Measurements (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
ASSETS    
Trading $ 3,538 $ 3,720
Equity 20,439 23,173
Available for sale (amortized cost $1,605,913 and $1,583,736) 1,425,511 1,571,148
Recurring fair value measurements    
ASSETS    
Trading 3,538 3,720
LIABILITIES    
TOTAL RECURRING FAIR VALUE MEASUREMENTS 1,401,131 1,644,617
Recurring fair value measurements | Equity Securities [Member]    
ASSETS    
Equity 20,439 23,173
Recurring fair value measurements | U.S. government agency securities    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736) 199,942 215,482
Recurring fair value measurements | Agency mortgage-backed securities    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736) 344,153 363,933
Recurring fair value measurements | Agency collateralized mortgage obligations    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736) 40,787 79,677
Recurring fair value measurements | Municipal Bonds [Member]    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736) 187 203
Recurring fair value measurements | Single issuer trust preferred securities issued by banks and insurers    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736) 489 491
Recurring fair value measurements | Pooled trust preferred securities issued by banks and insurers    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736) 999 1,000
Recurring fair value measurements | Small Business Administration Pooled Securities [Member]    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736) 54,496 48,914
Recurring fair value measurements | Loans held for sale    
ASSETS    
Loans Held-for-sale, Fair Value Disclosure 5,100 24,679
Recurring fair value measurements | Derivative Financial Instruments, Assets [Member]    
ASSETS    
Derivative Asset, Fair Value, Gross Asset 144,374 97,912
Recurring fair value measurements | Derivative instruments    
LIABILITIES    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 197,831 76,015
Recurring fair value measurements | US Treasury Securities [Member]    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736) 784,458 861,448
Nonrecurring fair value measurements    
LIABILITIES    
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS 13,020 1,174
Nonrecurring fair value measurements | Collateral Dependent Loans [Member]    
ASSETS    
Assets, Fair Value Disclosure [1] 13,020 1,174
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements    
ASSETS    
Trading 3,538 3,720
LIABILITIES    
TOTAL RECURRING FAIR VALUE MEASUREMENTS 23,977 26,893
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Equity Securities [Member]    
ASSETS    
Equity 20,439 23,173
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Municipal Bonds [Member]    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736)   0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Small Business Administration Pooled Securities [Member]    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736) 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Nonrecurring fair value measurements    
LIABILITIES    
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS 0 0
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements    
LIABILITIES    
TOTAL RECURRING FAIR VALUE MEASUREMENTS 1,377,154 1,617,724
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Equity Securities [Member]    
ASSETS    
Equity 0 0
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | U.S. government agency securities    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736) 199,942 215,482
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Agency mortgage-backed securities    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736) 344,153 363,933
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Agency collateralized mortgage obligations    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736) 40,787 79,677
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Municipal Bonds [Member]    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736) 187 203
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Single issuer trust preferred securities issued by banks and insurers    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736) 489 491
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Pooled trust preferred securities issued by banks and insurers    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736) 999 1,000
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Small Business Administration Pooled Securities [Member]    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736) 54,496 48,914
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Loans held for sale    
ASSETS    
Loans Held-for-sale, Fair Value Disclosure 5,100 24,679
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Derivative Financial Instruments, Assets [Member]    
ASSETS    
Derivative Asset, Fair Value, Gross Asset 144,374 97,912
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Derivative instruments    
LIABILITIES    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 197,831 76,015
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | US Treasury Securities [Member]    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736) 784,458 861,448
Significant Other Observable Inputs (Level 2) | Nonrecurring fair value measurements    
LIABILITIES    
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS 0 0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements    
LIABILITIES    
TOTAL RECURRING FAIR VALUE MEASUREMENTS 0 0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | Equity Securities [Member]    
ASSETS    
Equity 0 0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | Municipal Bonds [Member]    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736)   0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | Small Business Administration Pooled Securities [Member]    
ASSETS    
Available for sale (amortized cost $1,605,913 and $1,583,736) 0 0
Significant Unobservable Inputs (Level 3) | Nonrecurring fair value measurements    
LIABILITIES    
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS 13,020 1,174
Significant Unobservable Inputs (Level 3) | Nonrecurring fair value measurements | Collateral Dependent Loans [Member]    
ASSETS    
Assets, Fair Value Disclosure [1] $ 13,020 $ 1,174
[1] The carrying value of individually assessed collateral dependent loans is based on the lower of amortized cost or fair value of the underlying collateral less costs to sell. The fair value of the underlying collateral is generally determined through independent appraisals, which generally include various Level 3 inputs which are not identifiable. Appraisals may be adjusted by management for qualitative factors such as economic factors and estimated liquidation expenses. The range of these possible adjustments may vary.