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Fair Value Measurements (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
ASSETS    
Trading $ 4,476 $ 3,888
Equity 21,475 21,119
Recurring fair value measurements    
ASSETS    
Trading 4,476 3,888
LIABILITIES    
TOTAL RECURRING FAIR VALUE MEASUREMENTS 1,338,209 1,375,011
Recurring fair value measurements | Equity Securities [Member]    
ASSETS    
Equity 21,475 21,119
Recurring fair value measurements | U.S. government agency securities    
ASSETS    
Available for sale (amortized cost $1,524,555 and $1,566,779) 199,510 202,300
Recurring fair value measurements | Agency mortgage-backed securities    
ASSETS    
Available for sale (amortized cost $1,524,555 and $1,566,779) 274,708 313,688
Recurring fair value measurements | Agency collateralized mortgage obligations    
ASSETS    
Available for sale (amortized cost $1,524,555 and $1,566,779) 33,649 38,843
Recurring fair value measurements | Municipal Bonds [Member]    
ASSETS    
Available for sale (amortized cost $1,524,555 and $1,566,779) 184 191
Recurring fair value measurements | Pooled trust preferred securities issued by banks and insurers    
ASSETS    
Available for sale (amortized cost $1,524,555 and $1,566,779) 1,043 1,034
Recurring fair value measurements | Small Business Administration Pooled Securities [Member]    
ASSETS    
Available for sale (amortized cost $1,524,555 and $1,566,779) 45,763 51,757
Recurring fair value measurements | Loans held for sale    
ASSETS    
Loans Held-for-sale, Fair Value Disclosure 3,998 2,803
Recurring fair value measurements | Derivative Financial Instruments, Assets [Member]    
ASSETS    
Derivative Asset, Fair Value, Gross Asset 159,487 127,958
Recurring fair value measurements | Derivative instruments    
LIABILITIES    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 204,971 179,911
Recurring fair value measurements | US Treasury Securities [Member]    
ASSETS    
Available for sale (amortized cost $1,524,555 and $1,566,779) 798,887 791,341
Nonrecurring fair value measurements    
LIABILITIES    
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS 11,991 16,092
Nonrecurring fair value measurements | Collateral Dependent Loans [Member]    
ASSETS    
Assets, Fair Value Disclosure [1] 11,991 16,092
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements    
ASSETS    
Trading 4,476 3,888
LIABILITIES    
TOTAL RECURRING FAIR VALUE MEASUREMENTS 25,951 25,007
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Equity Securities [Member]    
ASSETS    
Equity 21,475 21,119
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Municipal Bonds [Member]    
ASSETS    
Available for sale (amortized cost $1,524,555 and $1,566,779)   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 $1,524,555 and $1,566,779) 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 1,312,258 1,350,004
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 $1,524,555 and $1,566,779) 199,510 202,300
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Agency mortgage-backed securities    
ASSETS    
Available for sale (amortized cost $1,524,555 and $1,566,779) 274,708 313,688
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Agency collateralized mortgage obligations    
ASSETS    
Available for sale (amortized cost $1,524,555 and $1,566,779) 33,649 38,843
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Municipal Bonds [Member]    
ASSETS    
Available for sale (amortized cost $1,524,555 and $1,566,779) 184 191
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 $1,524,555 and $1,566,779) 1,043 1,034
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Small Business Administration Pooled Securities [Member]    
ASSETS    
Available for sale (amortized cost $1,524,555 and $1,566,779) 45,763 51,757
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Loans held for sale    
ASSETS    
Loans Held-for-sale, Fair Value Disclosure 3,998 2,803
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Derivative Financial Instruments, Assets [Member]    
ASSETS    
Derivative Asset, Fair Value, Gross Asset 159,487 127,958
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Derivative instruments    
LIABILITIES    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 204,971 179,911
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | US Treasury Securities [Member]    
ASSETS    
Available for sale (amortized cost $1,524,555 and $1,566,779) 798,887 791,341
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 $1,524,555 and $1,566,779)   0
Significant Unobservable Inputs (Level 3) | Recurring fair value measurements | Small Business Administration Pooled Securities [Member]    
ASSETS    
Available for sale (amortized cost $1,524,555 and $1,566,779) 0 0
Significant Unobservable Inputs (Level 3) | Nonrecurring fair value measurements    
LIABILITIES    
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS 11,991 16,092
Significant Unobservable Inputs (Level 3) | Nonrecurring fair value measurements | Collateral Dependent Loans [Member]    
ASSETS    
Assets, Fair Value Disclosure [1] $ 11,991 $ 16,092
[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.