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Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Assets, Fair Value Disclosure [Abstract] |  |  |
Cash and Due from Banks | $ 490,431 | $ 544,059 |
Interest-bearing Deposits in Banks and Other Financial Institutions | 802,251 | 453,590 |
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure | 90 | 21,955 |
Debt Securities, Available-for-Sale | 5,217,278 | 4,581,434 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 3,636,139 | 3,738,747 |
Debt Securities, Held-to-Maturity, Fair Value | 3,182,394 | 3,185,494 |
Equity Securities, FV-NI and without Readily Determinable Fair Value | 26,000 | 23,242 |
FHLB and Federal Reserve Bank stocks | 251,642 | 179,665 |
Loans and Leases Receivable, Net Amount | 30,573,623 | 29,405,041 |
Life Insurance, Corporate or Bank Owned, Amount | 693,511 | 689,000 |
Assets | 44,455,863 | 43,023,068 |
Liabilities, Fair Value Disclosure |  |  |
Noninterest-bearing Domestic Deposit, Demand | 5,906,251 | 5,775,657 |
Deposits | 34,881,853 | 34,648,434 |
Federal Funds Purchased and Securities Sold under Agreements to Repurchase | 399,665 | 470,369 |
Short-Term Debt | 399,665 | 470,369 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | 3,220,679 | 1,853,807 |
Other Long-Term Debt | 594,074 | 837,635 |
Liabilities | 39,587,565 | 38,417,506 |
Standby Letters of Credit [Member] |  |  |
Liabilities, Fair Value Disclosure |  |  |
Lending Related Commitments | 221,900 | 253,700 |
Interest Rate Contract |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset | 20,441 | 31,950 |
Liabilities, Fair Value Disclosure |  |  |
Derivative Liability | 3,256 | 1,452 |
Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Cash and Due from Banks | 490,431 | 544,059 |
Interest-bearing Deposits in Banks and Other Financial Institutions | 802,251 | 453,590 |
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure | 90 | 21,955 |
Equity Securities, FV-NI | 11,000 | 10,742 |
Equity Securities, FV-NI and without Readily Determinable Fair Value | 26,000 | 23,242 |
FHLB and Federal Reserve Bank stocks | 251,642 | 179,665 |
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure | 74,563 | 646,687 |
Loan, Held-for-Sale, Fair Value Disclosure |  | 32,634 |
Loans and Leases Receivable, Net Amount | 30,558,859 | 29,373,557 |
Loans Receivable, Fair Value Disclosure | 29,800,771 | 28,327,115 |
Life Insurance, Corporate or Bank Owned, Amount | 693,511 | 689,000 |
Servicing Asset | 85,063 | 87,683 |
Assets | 41,926,669 | 40,471,048 |
Assets, Fair Value Disclosure | 40,714,835 | 38,871,352 |
Liabilities, Fair Value Disclosure |  |  |
Noninterest-bearing Domestic Deposit, Demand | 5,906,251 | 5,775,657 |
Deposits, Savings Deposits | 5,380,574 | 5,133,295 |
Interest-Bearing Domestic Deposit, Demand | 9,136,107 | 9,124,741 |
Deposits, Money Market Deposits | 6,455,589 | 6,637,915 |
Brokered CDs, Carrying Amount | 3,956,517 | 4,276,309 |
Brokered CDs, Fair Value | 3,956,517 | 4,276,309 |
Time Deposits, at Carrying Value | 4,046,815 | 3,700,518 |
Time Deposits | 4,046,815 | 3,700,518 |
Deposits | 34,881,853 | 34,648,434 |
Federal Funds Purchased and Securities Sold under Agreements to Repurchase | 399,665 | 470,369 |
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure | 400,172 | 470,370 |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | 3,220,679 | 1,853,807 |
Federal Home Loan Bank Borrowings, Fair Value Disclosure | 3,220,562 | 1,852,685 |
Other Long-Term Debt | 594,074 | 837,635 |
Long-term Debt, Fair Value | 599,184 | 823,991 |
Long-Term Line of Credit | 2,224 | 2,546 |
Liabilities | 39,213,059 | 37,991,364 |
Liabilities, Fair Value Disclosure | 39,218,558 | 37,976,599 |
Fair Value, Measurements, Recurring | Interest Rate Lock Commitments [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset | 1,129 | 327 |
Fair Value, Measurements, Recurring | Commitments [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset |  | 254 |
Liabilities, Fair Value Disclosure |  |  |
Derivative Liability | 450 |  |
Fair Value, Measurements, Recurring | Designated as Hedging Instrument | Interest Rate Contract |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset | 11,063 | 2,960 |
Liabilities, Fair Value Disclosure |  |  |
Derivative Liability | 46 | 2,976 |
Fair Value, Measurements, Recurring | Designated as Hedging Instrument | Foreign Exchange Forward [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 949 | 2,457 |
Liabilities, Fair Value Disclosure |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 866 | 563 |
Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument [Member] | Interest Rate Contract |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset | 74,500 | 88,541 |
Liabilities, Fair Value Disclosure |  |  |
Derivative Liability | 110,250 | 170,928 |
Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 3,200 | 4,315 |
Liabilities, Fair Value Disclosure |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 2,952 | 4,106 |
US Treasury Securities |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 995 | 1,000 |
Debt Securities, Held-to-Maturity, Fair Value | 1,014 | 999 |
US Treasury Securities | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 995 | 1,000 |
Debt Securities, Held-to-Maturity, Fair Value | 1,014 | 999 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 3,019 | 3,005 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 1,637,318 | 1,659,722 |
Debt Securities, Held-to-Maturity, Fair Value | 1,485,396 | 1,486,642 |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 3,019 | 3,005 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 1,637,318 | 1,659,662 |
Debt Securities, Held-to-Maturity, Fair Value | 1,485,396 | 1,486,582 |
Residential Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 123,560 | 110,928 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 836,619 | 885,476 |
Debt Securities, Held-to-Maturity, Fair Value | 705,725 | 721,946 |
Residential Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 4,862,225 | 4,227,727 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 40,301 | 43,693 |
Debt Securities, Held-to-Maturity, Fair Value | 37,871 | 39,927 |
Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | US Government Sponsored-Enterprise Insured Loans |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 123,560 | 110,928 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 836,619 | 885,476 |
Debt Securities, Held-to-Maturity, Fair Value | 705,725 | 721,946 |
Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | Government National Mortgage Association (GNMA) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 4,862,225 | 4,227,727 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 40,301 | 43,693 |
Debt Securities, Held-to-Maturity, Fair Value | 37,871 | 39,927 |
Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 307,569 | 324,182 |
Debt Securities, Held-to-Maturity, Fair Value | 261,038 | 266,353 |
Commercial Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 16,999 | 17,000 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 766,482 | 772,456 |
Debt Securities, Held-to-Maturity, Fair Value | 649,352 | 623,595 |
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 109,930 | 111,475 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 46,855 | 52,219 |
Debt Securities, Held-to-Maturity, Fair Value | 41,998 | 46,032 |
Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | US Government Sponsored-Enterprise Insured Loans |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 16,999 | 17,000 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 766,482 | 772,456 |
Debt Securities, Held-to-Maturity, Fair Value | 649,352 | 623,595 |
Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | Government National Mortgage Association (GNMA) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 109,930 | 111,475 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 46,855 | 52,219 |
Debt Securities, Held-to-Maturity, Fair Value | 41,998 | 46,032 |
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 98,198 | 107,839 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 0 |  |
Debt Securities, Held-to-Maturity, Fair Value | 0 |  |
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 98,198 | 107,839 |
US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 348 | 471 |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 0 |  |
Debt Securities, Held-to-Maturity, Fair Value | 0 |  |
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 348 | 471 |
Other Debt Obligations | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 3,000 | 2,989 |
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 5,217,278 | 4,581,434 |
Held-to-maturity Securities [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss | 3,636,139 | 3,738,687 |
Debt Securities, Held-to-Maturity, Fair Value | 3,182,394 | 3,185,434 |
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Cash and Due from Banks | 490,431 | 544,059 |
Interest-bearing Deposits in Banks and Other Financial Institutions | 802,251 | 453,590 |
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure | 90 | 21,955 |
Equity Securities, FV-NI | 10,942 | 10,670 |
FHLB and Federal Reserve Bank stocks | 0 | 0 |
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure | 0 | 0 |
Loan, Held-for-Sale, Fair Value Disclosure |  | 0 |
Loans Receivable, Fair Value Disclosure | 0 | 0 |
Life Insurance, Corporate or Bank Owned, Amount | 0 | 0 |
Servicing Asset | 0 | 0 |
Assets, Fair Value Disclosure | 1,304,728 | 1,031,273 |
Liabilities, Fair Value Disclosure |  |  |
Noninterest-bearing Domestic Deposit, Demand | 0 | 0 |
Deposits, Savings Deposits | 0 | 0 |
Interest-Bearing Domestic Deposit, Demand | 0 | 0 |
Deposits, Money Market Deposits | 0 | 0 |
Brokered CDs, Fair Value | 0 | 0 |
Time Deposits | 0 | 0 |
Deposits | 0 | 0 |
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure | 0 | 0 |
Federal Home Loan Bank Borrowings, Fair Value Disclosure | 0 | 0 |
Long-term Debt, Fair Value | 0 | 0 |
Long-Term Line of Credit | 0 | 0 |
Liabilities, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Interest Rate Lock Commitments [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset | 0 | 0 |
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Commitments [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset |  | 0 |
Liabilities, Fair Value Disclosure |  |  |
Derivative Liability | 0 |  |
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Designated as Hedging Instrument | Interest Rate Contract |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset | 0 | 0 |
Liabilities, Fair Value Disclosure |  |  |
Derivative Liability | 0 | 0 |
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Designated as Hedging Instrument | Foreign Exchange Forward [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0 | 0 |
Liabilities, Fair Value Disclosure |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument [Member] | Interest Rate Contract |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset | 0 | 0 |
Liabilities, Fair Value Disclosure |  |  |
Derivative Liability | 0 | 0 |
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0 | 0 |
Liabilities, Fair Value Disclosure |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 1 | US Treasury Securities | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Held-to-Maturity, Fair Value | 1,014 | 999 |
Fair Value, Inputs, Level 1 | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Debt Securities, Held-to-Maturity, Fair Value | 0 | 0 |
Fair Value, Inputs, Level 1 | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | US Government Sponsored-Enterprise Insured Loans |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Debt Securities, Held-to-Maturity, Fair Value | 0 | 0 |
Fair Value, Inputs, Level 1 | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | Government National Mortgage Association (GNMA) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Debt Securities, Held-to-Maturity, Fair Value | 0 | 0 |
Fair Value, Inputs, Level 1 | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Held-to-Maturity, Fair Value | 0 | 0 |
Fair Value, Inputs, Level 1 | Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | US Government Sponsored-Enterprise Insured Loans |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Debt Securities, Held-to-Maturity, Fair Value | 0 | 0 |
Fair Value, Inputs, Level 1 | Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | Government National Mortgage Association (GNMA) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Debt Securities, Held-to-Maturity, Fair Value | 0 | 0 |
Fair Value, Inputs, Level 1 | Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Inputs, Level 1 | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Inputs, Level 1 | Other Debt Obligations | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Inputs, Level 1 | Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Inputs, Level 1 | Held-to-maturity Securities [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Held-to-Maturity, Fair Value | 1,014 | 999 |
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Cash and Due from Banks | 0 | 0 |
Interest-bearing Deposits in Banks and Other Financial Institutions | 0 | 0 |
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure | 0 | 0 |
Equity Securities, FV-NI | 0 | 0 |
FHLB and Federal Reserve Bank stocks | 251,642 | 179,665 |
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure | 74,563 | 646,687 |
Loan, Held-for-Sale, Fair Value Disclosure |  | 32,634 |
Loans Receivable, Fair Value Disclosure | 0 | 0 |
Life Insurance, Corporate or Bank Owned, Amount | 693,511 | 689,000 |
Servicing Asset | 0 | 0 |
Assets, Fair Value Disclosure | 9,508,086 | 9,412,129 |
Liabilities, Fair Value Disclosure |  |  |
Noninterest-bearing Domestic Deposit, Demand | 0 | 0 |
Deposits, Savings Deposits | 0 | 0 |
Interest-Bearing Domestic Deposit, Demand | 0 | 0 |
Deposits, Money Market Deposits | 0 | 0 |
Brokered CDs, Fair Value | 3,956,517 | 4,276,309 |
Time Deposits | 4,046,815 | 3,700,518 |
Deposits | 8,003,332 | 7,976,827 |
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure | 400,172 | 470,370 |
Federal Home Loan Bank Borrowings, Fair Value Disclosure | 3,220,562 | 1,852,685 |
Long-term Debt, Fair Value | 599,184 | 823,991 |
Long-Term Line of Credit | 2,224 | 2,546 |
Liabilities, Fair Value Disclosure | 12,339,588 | 11,304,992 |
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Foreign Exchange Forward [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset | 3,200 | 4,315 |
Liabilities, Fair Value Disclosure |  |  |
Derivative Liability | 2,952 | 4,106 |
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Interest Rate Lock Commitments [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset | 0 | 0 |
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Commitments [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset |  | 0 |
Liabilities, Fair Value Disclosure |  |  |
Derivative Liability | 0 |  |
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Designated as Hedging Instrument | Interest Rate Contract |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset | 11,063 | 2,960 |
Liabilities, Fair Value Disclosure |  |  |
Derivative Liability | 46 | 2,976 |
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Designated as Hedging Instrument | Foreign Exchange Forward [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset | 949 | 2,457 |
Foreign Currency Contract, Asset, Fair Value Disclosure | 949 | 2,457 |
Liabilities, Fair Value Disclosure |  |  |
Derivative Liability | 866 | 563 |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 866 | 563 |
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument [Member] | Interest Rate Contract |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset | 74,500 | 88,541 |
Liabilities, Fair Value Disclosure |  |  |
Derivative Liability | 110,250 | 170,928 |
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 3,200 | 4,315 |
Liabilities, Fair Value Disclosure |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 2,952 | 4,106 |
Fair Value, Inputs, Level 2 | US Treasury Securities | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Held-to-Maturity, Fair Value | 0 | 0 |
Fair Value, Inputs, Level 2 | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 3,019 | 3,005 |
Debt Securities, Held-to-Maturity, Fair Value | 1,485,396 | 1,486,582 |
Fair Value, Inputs, Level 2 | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | US Government Sponsored-Enterprise Insured Loans |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 123,560 | 110,928 |
Debt Securities, Held-to-Maturity, Fair Value | 705,725 | 721,946 |
Fair Value, Inputs, Level 2 | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | Government National Mortgage Association (GNMA) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 4,862,225 | 4,227,727 |
Debt Securities, Held-to-Maturity, Fair Value | 37,871 | 39,927 |
Fair Value, Inputs, Level 2 | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Held-to-Maturity, Fair Value | 261,038 | 266,353 |
Fair Value, Inputs, Level 2 | Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | US Government Sponsored-Enterprise Insured Loans |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 16,999 | 17,000 |
Debt Securities, Held-to-Maturity, Fair Value | 649,352 | 623,595 |
Fair Value, Inputs, Level 2 | Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | Government National Mortgage Association (GNMA) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 109,930 | 111,475 |
Debt Securities, Held-to-Maturity, Fair Value | 41,998 | 46,032 |
Fair Value, Inputs, Level 2 | Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 98,198 | 107,839 |
Fair Value, Inputs, Level 2 | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 348 | 471 |
Fair Value, Inputs, Level 2 | Other Debt Obligations | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 3,000 | 2,989 |
Fair Value, Inputs, Level 2 | Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 5,217,278 | 4,581,434 |
Fair Value, Inputs, Level 2 | Held-to-maturity Securities [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Held-to-Maturity, Fair Value | 3,181,380 | 3,184,435 |
Fair Value, Inputs, Level 3 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Equity Securities, FV-NI | 58 | 72 | $ 24,769
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Cash and Due from Banks | 0 | 0 |
Interest-bearing Deposits in Banks and Other Financial Institutions | 0 | 0 |
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure | 0 | 0 |
Equity Securities, FV-NI | 58 | 72 |
FHLB and Federal Reserve Bank stocks | 0 | 0 |
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure | 0 | 0 |
Loan, Held-for-Sale, Fair Value Disclosure |  | 0 |
Loans Receivable, Fair Value Disclosure | 29,800,771 | 28,327,115 |
Life Insurance, Corporate or Bank Owned, Amount | 0 | 0 |
Servicing Asset | 85,063 | 87,683 |
Assets, Fair Value Disclosure | 29,887,021 | 28,415,450 |
Liabilities, Fair Value Disclosure |  |  |
Noninterest-bearing Domestic Deposit, Demand | 5,906,251 | 5,775,657 |
Deposits, Savings Deposits | 5,380,574 | 5,133,295 |
Interest-Bearing Domestic Deposit, Demand | 9,136,107 | 9,124,741 |
Deposits, Money Market Deposits | 6,455,589 | 6,637,915 |
Brokered CDs, Fair Value | 0 | 0 |
Time Deposits | 0 | 0 |
Deposits | 26,878,521 | 26,671,607 |
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure | 0 | 0 |
Federal Home Loan Bank Borrowings, Fair Value Disclosure | 0 | 0 |
Long-term Debt, Fair Value | 0 | 0 |
Long-Term Line of Credit | 0 | 0 |
Liabilities, Fair Value Disclosure | 26,878,970 | 26,671,607 |
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Interest Rate Lock Commitments [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset | 1,129 | 327 |
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Commitments [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset |  | 254 |
Liabilities, Fair Value Disclosure |  |  |
Derivative Liability | 450 |  |
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Designated as Hedging Instrument | Interest Rate Contract |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset | 0 | 0 |
Liabilities, Fair Value Disclosure |  |  |
Derivative Liability | 0 | 0 |
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Designated as Hedging Instrument | Foreign Exchange Forward [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0 | 0 |
Liabilities, Fair Value Disclosure |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument [Member] | Interest Rate Contract |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset | 0 | 0 |
Liabilities, Fair Value Disclosure |  |  |
Derivative Liability | 0 | 0 |
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0 | 0 |
Liabilities, Fair Value Disclosure |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Derivative Asset | 1,129 | 580 |
Fair Value, Inputs, Level 3 | US Treasury Securities | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Held-to-Maturity, Fair Value | 0 | 0 |
Fair Value, Inputs, Level 3 | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Debt Securities, Held-to-Maturity, Fair Value | 0 | 0 |
Fair Value, Inputs, Level 3 | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | US Government Sponsored-Enterprise Insured Loans |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Debt Securities, Held-to-Maturity, Fair Value | 0 | 0 |
Fair Value, Inputs, Level 3 | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | Government National Mortgage Association (GNMA) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Debt Securities, Held-to-Maturity, Fair Value | 0 | 0 |
Fair Value, Inputs, Level 3 | Residential Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Held-to-Maturity, Fair Value | 0 | 0 |
Fair Value, Inputs, Level 3 | Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | US Government Sponsored-Enterprise Insured Loans |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Debt Securities, Held-to-Maturity, Fair Value | 0 | 0 |
Fair Value, Inputs, Level 3 | Commercial Mortgage-Backed Securities [Member] | Fair Value, Measurements, Recurring | Government National Mortgage Association (GNMA) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Debt Securities, Held-to-Maturity, Fair Value | 0 | 0 |
Fair Value, Inputs, Level 3 | Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Inputs, Level 3 | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Inputs, Level 3 | Other Debt Obligations | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Inputs, Level 3 | Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Available-for-Sale | 0 | 0 |
Fair Value, Inputs, Level 3 | Held-to-maturity Securities [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Debt Securities, Held-to-Maturity, Fair Value | 0 | 0 |
Fair Value, Inputs, NAV [Member] | Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Equity Securities, FV-NI | $ 15,000 | $ 12,500 |

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