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Fair Value Measurements (Details 1) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
ASSETS |  |  |
Trading |  | $ 4,801 | $ 4,245
Equity |  | 21,258 | 21,204
LIABILITIES |  |  |
Debt Securities, Held-to-maturity, Fair Value |  | 1,273,690 | 1,291,801
Federal Home Loan Bank Stock |  | 21,052 | 31,573
Bank Owned Life Insurance |  | 305,077 | 303,965
Federal Home Loan Bank borrowings (f) |  | 400,500 | 638,514
Deposits [Member] |  |  |
LIABILITIES |  |  |
Financial Liabilities Book Value | [1] | 13,173,541 | 12,558,632
Accrued Liabilities, Fair Value Disclosure | [1] | 13,173,541 | 12,558,632
Bank Time Deposits [Member] |  |  |
LIABILITIES |  |  |
Financial Liabilities Book Value | [2] | 2,720,199 | 2,747,346
Accrued Liabilities, Fair Value Disclosure | [2] | 2,712,834 | 2,739,606
Federal Home Loan Bank Advances [Member] |  |  |
LIABILITIES |  |  |
Federal Home Loan Bank borrowings (f) | [2] | 400,500 | 638,514
Federal Home Loan Bank Borrowings, Fair Value Disclosure | [2] | 400,454 | 638,489
Junior Subordinated Debt [Member] |  |  |
LIABILITIES |  |  |
Accrued Liabilities, Fair Value Disclosure | [3] | 62,081 | 61,661
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust | [3] | 62,861 | 62,860
Reported Value Measurement |  |  |
LIABILITIES |  |  |
Loans Receivable, Fair Value Disclosure | [4] | 14,353,371 | 14,294,628
Estimate of Fair Value Measurement |  |  |
LIABILITIES |  |  |
Loans Receivable, Fair Value Disclosure | [4] | 13,465,609 | 13,213,596
Agency mortgage-backed securities |  |  |
LIABILITIES |  |  |
Debt Securities, Held-to-maturity, Fair Value |  | 723,650 | 726,362
Small Business Administration Pooled Securities [Member] |  |  |
LIABILITIES |  |  |
Debt Securities, Held-to-maturity, Fair Value |  | 112,097 | 114,733
US Treasury Securities [Member] |  |  |
LIABILITIES |  |  |
Debt Securities, Held-to-maturity, Fair Value |  | 95,520 | 93,022
Recurring fair value measurements |  |  |
ASSETS |  |  |
Trading |  | 4,801 | 4,245
LIABILITIES |  |  |
TOTAL RECURRING FAIR VALUE MEASUREMENTS |  | 1,317,696 | 1,263,867
Recurring fair value measurements | Equity Securities [Member] |  |  |
ASSETS |  |  |
Equity |  | 21,258 | 21,204
Recurring fair value measurements | U.S. government agency securities |  |  |
ASSETS |  |  |
Available for sale (amortized cost $1,355,331 and $1,353,964) |  | 215,270 | 209,660
Recurring fair value measurements | Agency mortgage-backed securities |  |  |
ASSETS |  |  |
Available for sale (amortized cost $1,355,331 and $1,353,964) |  | 497,336 | 378,161
Recurring fair value measurements | Agency collateralized mortgage obligations |  |  |
ASSETS |  |  |
Available for sale (amortized cost $1,355,331 and $1,353,964) |  | 27,223 | 28,995
Recurring fair value measurements | Municipal Bonds [Member] |  |  |
ASSETS |  |  |
Available for sale (amortized cost $1,355,331 and $1,353,964) |  | 197 | 194
Recurring fair value measurements | Pooled trust preferred securities issued by banks and insurers |  |  |
ASSETS |  |  |
Available for sale (amortized cost $1,355,331 and $1,353,964) |  | 1,038 | 1,095
Recurring fair value measurements | Small Business Administration Pooled Securities [Member] |  |  |
ASSETS |  |  |
Available for sale (amortized cost $1,355,331 and $1,353,964) |  | 39,551 | 40,838
Recurring fair value measurements | Loans held for sale |  |  |
ASSETS |  |  |
Loans Held-for-sale, Fair Value Disclosure |  | 16,792 | 7,271
Recurring fair value measurements | Derivative Financial Instruments, Assets [Member] |  |  |
ASSETS |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 74,653 | 103,958
Recurring fair value measurements | Derivative instruments |  |  |
LIABILITIES |  |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 86,126 | 123,755
Recurring fair value measurements | US Treasury Securities [Member] |  |  |
ASSETS |  |  |
Available for sale (amortized cost $1,355,331 and $1,353,964) |  | 505,703 | 592,001
Nonrecurring fair value measurements |  |  |
LIABILITIES |  |  |
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS |  | 37,784 | 43,766
Nonrecurring fair value measurements | Collateral Dependent Loans [Member] |  |  |
ASSETS |  |  |
Assets, Fair Value Disclosure | [5] | 35,684 | 43,766
Nonrecurring fair value measurements | Other Real Estate Owned and Other Foreclosed Assets |  |  |
ASSETS |  |  |
Assets, Fair Value Disclosure | [5] | 2,100 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements |  |  |
ASSETS |  |  |
Trading |  | 4,801 | 4,245
LIABILITIES |  |  |
TOTAL RECURRING FAIR VALUE MEASUREMENTS |  | 26,059 | 25,449
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring fair value measurements | Equity Securities [Member] |  |  |
ASSETS |  |  |
Equity |  | 21,258 | 21,204
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) | Deposits [Member] |  |  |
LIABILITIES |  |  |
Accrued Liabilities, Fair Value Disclosure | [1] | 13,173,541 | 12,558,632
Significant Other Observable Inputs (Level 2) | Bank Time Deposits [Member] |  |  |
LIABILITIES |  |  |
Accrued Liabilities, Fair Value Disclosure | [2] | 2,712,834 | 2,739,606
Significant Other Observable Inputs (Level 2) | Federal Home Loan Bank Advances [Member] |  |  |
LIABILITIES |  |  |
Federal Home Loan Bank Borrowings, Fair Value Disclosure | [2] | 400,454 | 638,489
Significant Other Observable Inputs (Level 2) | Junior Subordinated Debt [Member] |  |  |
LIABILITIES |  |  |
Accrued Liabilities, Fair Value Disclosure | [3] | 62,081 | 61,661
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements |  |  |
LIABILITIES |  |  |
TOTAL RECURRING FAIR VALUE MEASUREMENTS |  | 1,291,637 | 1,238,418
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | U.S. government agency securities |  |  |
ASSETS |  |  |
Available for sale (amortized cost $1,355,331 and $1,353,964) |  | 215,270 | 209,660
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Agency mortgage-backed securities |  |  |
ASSETS |  |  |
Available for sale (amortized cost $1,355,331 and $1,353,964) |  | 497,336 | 378,161
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Agency collateralized mortgage obligations |  |  |
ASSETS |  |  |
Available for sale (amortized cost $1,355,331 and $1,353,964) |  | 27,223 | 28,995
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Municipal Bonds [Member] |  |  |
ASSETS |  |  |
Available for sale (amortized cost $1,355,331 and $1,353,964) |  | 197 | 194
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 $1,355,331 and $1,353,964) |  | 1,038 | 1,095
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Small Business Administration Pooled Securities [Member] |  |  |
ASSETS |  |  |
Available for sale (amortized cost $1,355,331 and $1,353,964) |  | 39,551 | 40,838
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Loans held for sale |  |  |
ASSETS |  |  |
Loans Held-for-sale, Fair Value Disclosure |  | 16,792 | 7,271
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Derivative Financial Instruments, Assets [Member] |  |  |
ASSETS |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 74,653 | 103,958
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | Derivative instruments |  |  |
LIABILITIES |  |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 86,126 | 123,755
Significant Other Observable Inputs (Level 2) | Recurring fair value measurements | US Treasury Securities [Member] |  |  |
ASSETS |  |  |
Available for sale (amortized cost $1,355,331 and $1,353,964) |  | 505,703 | 592,001
Significant Other Observable Inputs (Level 2) | Nonrecurring fair value measurements |  |  |
LIABILITIES |  |  |
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS |  | 0 | 0
Significant Unobservable Inputs (Level 3) | Estimate of Fair Value Measurement |  |  |
LIABILITIES |  |  |
Loans Receivable, Fair Value Disclosure | [4] | 13,465,609 | 13,213,596
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 | Small Business Administration Pooled Securities [Member] |  |  |
ASSETS |  |  |
Available for sale (amortized cost $1,355,331 and $1,353,964) |  | 0 |
Significant Unobservable Inputs (Level 3) | Nonrecurring fair value measurements |  |  |
LIABILITIES |  |  |
TOTAL NONRECURRING FAIR VALUE MEASUREMENTS |  | 37,784 | 43,766
Significant Unobservable Inputs (Level 3) | Nonrecurring fair value measurements | Collateral Dependent Loans [Member] |  |  |
ASSETS |  |  |
Assets, Fair Value Disclosure | [5] | 35,684 | 43,766
Significant Unobservable Inputs (Level 3) | Nonrecurring fair value measurements | Other Real Estate Owned and Other Foreclosed Assets |  |  |
ASSETS |  |  |
Assets, Fair Value Disclosure | [5] | 2,100 |
US Treasury Securities [Member] |  |  |
LIABILITIES |  |  |
Debt Securities, Held-to-maturity | [6] | 100,831 | 100,791
Debt Securities, Held-to-maturity, Fair Value | [6] | 95,520 | 93,022
US Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) |  |  |
LIABILITIES |  |  |
Debt Securities, Held-to-maturity, Fair Value | [6] | 95,520 | 93,022
Agency mortgage-backed securities |  |  |
LIABILITIES |  |  |
Debt Securities, Held-to-maturity | [6] | 769,077 | 788,470
Debt Securities, Held-to-maturity, Fair Value | [6] | 723,650 | 726,362
Agency mortgage-backed securities | Significant Other Observable Inputs (Level 2) |  |  |
LIABILITIES |  |  |
Debt Securities, Held-to-maturity, Fair Value | [6] | 723,650 | 726,362
Agency collateralized mortgage obligations |  |  |
LIABILITIES |  |  |
Debt Securities, Held-to-maturity | [6] | 395,526 | 422,827
Debt Securities, Held-to-maturity, Fair Value | [6] | 342,423 | 357,684
Agency collateralized mortgage obligations | Significant Other Observable Inputs (Level 2) |  |  |
LIABILITIES |  |  |
Debt Securities, Held-to-maturity, Fair Value | [6] | 342,423 | 357,684
Small Business Administration Pooled Securities [Member] |  |  |
LIABILITIES |  |  |
Debt Securities, Held-to-maturity | [6] | 117,469 | 122,868
Debt Securities, Held-to-maturity, Fair Value | [6] | 112,097 | 114,733
Small Business Administration Pooled Securities [Member] | Significant Other Observable Inputs (Level 2) |  |  |
LIABILITIES |  |  |
Debt Securities, Held-to-maturity, Fair Value | [6] | 112,097 | 114,733
Investment in Federal Home Loan Bank Stock [Member] |  |  |
LIABILITIES |  |  |
Federal Home Loan Bank Stock | [7] | 21,052 | 31,573
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure | [7] | 21,052 | 31,573
Investment in Federal Home Loan Bank Stock [Member] | Significant Other Observable Inputs (Level 2) |  |  |
LIABILITIES |  |  |
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure | [7] | 21,052 | 31,573
Investment in Federal Home Loan Bank Stock [Member] | Significant Unobservable Inputs (Level 3) |  |  |
LIABILITIES |  |  |
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure | [7] | 0 |
Cash Surrender Value [Member] |  |  |
LIABILITIES |  |  |
Bank Owned Life Insurance | [8] | 305,077 | 303,965
Cash Surrender Value, Fair Value Disclosure | [8] | 305,077 | 303,965
Cash Surrender Value [Member] | Significant Other Observable Inputs (Level 2) |  |  |
LIABILITIES |  |  |
Cash Surrender Value, Fair Value Disclosure | [8] | $ 305,077 | $ 303,965
[1] | Fair value of demand deposits, savings and interest checking accounts and money market deposits is the amount payable on demand at the reporting date.
[2] | Fair value was determined by discounting anticipated future cash payments using rates currently available for instruments with similar remaining maturities.
[3] | Fair value was determined based upon market prices of securities with similar terms and maturities.
[4] | Fair value of loans is measured using the exit price valuation method, determined primarily by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities or cash flows, while incorporating liquidity and credit assumptions. Additionally, this amount excludes individually assessed collateral dependent loans, which are deemed to be marked to fair value on a nonrecurring basis.
[5] | 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.
[6] | The fair values presented are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on quoted market prices of comparable instruments and/or discounted cash flow analysis.
[7] | Federal Home Loan Bank stock has no quoted market value and is carried at cost; therefore, the carrying amount approximates fair value.
[8] | Cash surrender value of life insurance policies is recorded at its cash surrender value (or the amount that can be realized upon surrender of the policy), therefore, carrying amount approximates fair value.

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