Fair Value Measurements (Details 1) - USD ($) $ in Thousands		Jun. 30, 2023	Dec. 31, 2022
ASSETS
Trading		$ 4,477	$ 3,888
Equity		21,800	21,119
Recurring fair value measurements
ASSETS
Trading		4,477	3,888
LIABILITIES
TOTAL RECURRING FAIR VALUE MEASUREMENTS		1,360,135	1,375,011
Recurring fair value measurements | Equity Securities [Member]
ASSETS
Equity		21,800	21,119
Recurring fair value measurements | U.S. government agency securities
ASSETS
Available for sale (amortized cost $1,533,336 and $1,566,779)		202,491	202,300
Recurring fair value measurements | Agency mortgage-backed securities
ASSETS
Available for sale (amortized cost $1,533,336 and $1,566,779)		287,418	313,688
Recurring fair value measurements | Agency collateralized mortgage obligations
ASSETS
Available for sale (amortized cost $1,533,336 and $1,566,779)		35,785	38,843
Recurring fair value measurements | Municipal Bonds [Member]
ASSETS
Available for sale (amortized cost $1,533,336 and $1,566,779)		190	191
Recurring fair value measurements | Pooled trust preferred securities issued by banks and insurers
ASSETS
Available for sale (amortized cost $1,533,336 and $1,566,779)		1,025	1,034
Recurring fair value measurements | Small Business Administration Pooled Securities [Member]
ASSETS
Available for sale (amortized cost $1,533,336 and $1,566,779)		48,133	51,757
Recurring fair value measurements | Loans held for sale
ASSETS
Loans Held-for-sale, Fair Value Disclosure		6,577	2,803
Recurring fair value measurements | Derivative Financial Instruments, Assets [Member]
ASSETS
Derivative Asset, Fair Value, Gross Asset		131,931	127,958
Recurring fair value measurements | Derivative instruments
LIABILITIES
Financial and Nonfinancial Liabilities, Fair Value Disclosure		177,553	179,911
Recurring fair value measurements | US Treasury Securities [Member]
ASSETS
Available for sale (amortized cost $1,533,336 and $1,566,779)		797,861	791,341
Nonrecurring fair value measurements
LIABILITIES
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS		12,595	16,092
Nonrecurring fair value measurements | Collateral Dependent Loans [Member]
ASSETS
Assets, Fair Value Disclosure	[1]	12,595	16,092
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements
ASSETS
Trading		4,477	3,888
LIABILITIES
TOTAL RECURRING FAIR VALUE MEASUREMENTS		26,277	25,007
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Equity Securities [Member]
ASSETS
Equity		21,800	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 $1,533,336 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 $1,533,336 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		1,333,858	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 $1,533,336 and $1,566,779)		202,491	202,300
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Agency mortgage-backed securities
ASSETS
Available for sale (amortized cost $1,533,336 and $1,566,779)		287,418	313,688
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Agency collateralized mortgage obligations
ASSETS
Available for sale (amortized cost $1,533,336 and $1,566,779)		35,785	38,843
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Municipal Bonds [Member]
ASSETS
Available for sale (amortized cost $1,533,336 and $1,566,779)		190	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 $1,533,336 and $1,566,779)		1,025	1,034
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Small Business Administration Pooled Securities [Member]
ASSETS
Available for sale (amortized cost $1,533,336 and $1,566,779)		48,133	51,757
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Loans held for sale
ASSETS
Loans Held-for-sale, Fair Value Disclosure		6,577	2,803
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Derivative Financial Instruments, Assets [Member]
ASSETS
Derivative Asset, Fair Value, Gross Asset		131,931	127,958
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Derivative instruments
LIABILITIES
Financial and Nonfinancial Liabilities, Fair Value Disclosure		177,553	179,911
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | US Treasury Securities [Member]
ASSETS
Available for sale (amortized cost $1,533,336 and $1,566,779)		797,861	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 $1,533,336 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 $1,533,336 and $1,566,779)		0	0
Significant Unobservable Inputs (Level 3) | Nonrecurring fair value measurements
LIABILITIES
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS		12,595	16,092
Significant Unobservable Inputs (Level 3) | Nonrecurring fair value measurements | Collateral Dependent Loans [Member]
ASSETS
Assets, Fair Value Disclosure	[1]	$ 12,595	$ 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.