Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	$ 4,581,434	$ 3,600,892
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,738,747	3,860,235
Debt Securities, Held-to-Maturity, Fair Value	3,185,494	3,380,624
Equity Securities, FV-NI and without Readily Determinable Fair Value	23,242	41,651
Assets	43,023,068	41,015,855
Liabilities, Fair Value Disclosure [Abstract]
Noninterest-bearing Domestic Deposit, Demand	5,775,657	6,119,956
Deposits, Savings Deposits	5,133,295	4,835,701
Deposits, Money Market Deposits	6,637,915	6,330,453
Time Deposits	7,976,827
Deposits	34,648,434	33,446,049
Federal Funds Purchased and Securities Sold under Agreements to Repurchase	470,369	326,780
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	1,853,807	1,940,194
Other Long-Term Debt	837,635	541,269
Liabilities	38,417,506	36,841,882
Standby Letters of Credit [Member]
Liabilities, Fair Value Disclosure [Abstract]
Other Commitment	253,709	212,029
Interest Rate Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	31,950	32,985
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	1,452	533
Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Due from Banks	544,059	484,384
Interest-Bearing Deposits in Banks and Other Financial Institutions	453,590	425,089
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	21,955	14,350
Equity Securities, FV-NI	10,742	31,651
Equity Securities, FV-NI and without Readily Determinable Fair Value	23,242	41,651
FHLB and Federal Reserve Bank stocks	179,665	229,171
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure	646,687	33,011
Loan, Held-for-Sale, Fair Value Disclosure	32,634	90,303
Loans and Leases Receivable, Net Amount	29,373,557	28,865,124
Loans Receivable, Fair Value Disclosure	28,327,115	27,371,086
Life Insurance, Corporate or Bank Owned, Amount	689,000	682,649
Servicing Asset	87,683	84,390
Assets	40,471,048	38,534,897
Assets, Fair Value Disclosure	38,871,352	36,561,249
Liabilities, Fair Value Disclosure [Abstract]
Noninterest-bearing Domestic Deposit, Demand	5,775,657	6,119,956
Deposits, Savings Deposits	5,133,295	4,835,701
Interest-Bearing Domestic Deposit, Demand	9,124,741	8,843,967
Deposits, Money Market Deposits	6,637,915	6,330,453
Brokered CDs, Carrying Amount	4,276,309	4,447,479
Brokered CDs, Fair Value	4,276,309	4,447,479
Time Deposits, at Carrying Value	3,700,518	2,868,494
Time Deposits	3,700,518	2,868,494
Deposits	34,648,434	33,446,049
Federal Funds Purchased and Securities Sold under Agreements to Repurchase	470,369	326,780
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	470,370	326,757
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	1,853,807	1,940,194
Federal Home Loan Bank Borrowings, Fair Value Disclosure	1,852,685	1,944,600
Other Long-Term Debt	837,635	541,269
Long-term Debt, Fair Value	823,991	534,983
Long-term Line of Credit	2,546	2,157
Liabilities	37,991,364	36,459,407
Liabilities, Fair Value Disclosure	37,976,599	36,457,504
Fair Value, Recurring [Member] \| Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	254
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability		673
Fair Value, Recurring [Member] \| Interest Rate Lock Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	327	439
Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	2,960	8,075
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	2,976	930
Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member] \| Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Foreign Currency Contract, Asset, Fair Value Disclosure	2,457	632
Liabilities, Fair Value Disclosure [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure	563	2,946
Fair Value, Recurring [Member] \| Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	88,541	111,623
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	170,928	195,662
Fair Value, Recurring [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Foreign Currency Contract, Asset, Fair Value Disclosure	4,315	2,954
Liabilities, Fair Value Disclosure [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure	4,106	2,746
US Treasury Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale		35,902
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,000	999
Debt Securities, Held-to-Maturity, Fair Value	999	963
US Treasury Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale		35,902
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,000	999
Debt Securities, Held-to-Maturity, Fair Value	999	963
US States and Political Subdivisions Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	3,005	91,817
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,659,722	1,682,473
Debt Securities, Held-to-Maturity, Fair Value	1,486,642	1,554,059
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	3,005	91,817
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,659,662	1,682,398
Debt Securities, Held-to-Maturity, Fair Value	1,486,582	1,553,984
Residential Mortgage-Backed Securities [Member] \| US Government Sponsored-Enterprise Insured Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	110,928	1,120,794
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	885,476	941,973
Debt Securities, Held-to-Maturity, Fair Value	721,946	804,393
Residential Mortgage-Backed Securities [Member] \| Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	4,227,727	2,042,675
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	43,693	48,979
Debt Securities, Held-to-Maturity, Fair Value	39,927	46,170
Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| US Government Sponsored-Enterprise Insured Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	110,928	1,120,794
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	885,476	941,973
Debt Securities, Held-to-Maturity, Fair Value	721,946	804,393
Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	4,227,727	2,042,675
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	43,693	48,979
Debt Securities, Held-to-Maturity, Fair Value	39,927	46,170
Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| 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	324,182	345,083
Debt Securities, Held-to-Maturity, Fair Value	266,353	289,507
Commercial Mortgage-Backed Securities [Member] \| US Government Sponsored-Enterprise Insured Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	17,000	16,937
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	772,456	780,995
Debt Securities, Held-to-Maturity, Fair Value	623,595	632,914
Commercial Mortgage-Backed Securities [Member] \| Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	111,475	154,793
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	52,219	59,733
Debt Securities, Held-to-Maturity, Fair Value	46,032	52,619
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| US Government Sponsored-Enterprise Insured Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	17,000	16,937
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	772,456	780,995
Debt Securities, Held-to-Maturity, Fair Value	623,595	632,914
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	111,475	154,793
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	52,219	59,733
Debt Securities, Held-to-Maturity, Fair Value	46,032	52,619
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	107,839	133,975
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, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	107,839	133,975
US Government-sponsored Enterprises Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	471	1,051
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, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	471	1,051
Other Debt And Other Equity Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	2,989	2,950
Other Debt And Other Equity Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	2,989	2,950
Available-for-Sale Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	4,581,434	3,600,892
Held-to-Maturity Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,738,687	3,860,160
Debt Securities, Held-to-Maturity, Fair Value	3,185,434	3,380,550
Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Due from Banks	544,059	484,384
Interest-Bearing Deposits in Banks and Other Financial Institutions	453,590	425,089
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and Due from Banks	544,059	484,384
Interest-Bearing Deposits in Banks and Other Financial Institutions	453,590	425,089
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	21,955	14,350
Equity Securities, FV-NI	10,670	6,883
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	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	1,031,273	967,570
Liabilities, Fair Value Disclosure [Abstract]
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 [Member] \| Fair Value, Recurring [Member] \| Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	0
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability		0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Lock Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| 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 [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	0	0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| 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 [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 [Member] \| US Treasury Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale		35,902
Debt Securities, Held-to-Maturity, Fair Value	999	963
Fair Value, Inputs, Level 1 [Member] \| US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [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 [Member] \| Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| US Government Sponsored-Enterprise Insured Loans [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 [Member] \| Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| 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 [Member] \| Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| 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 [Member] \| Commercial Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| US Government Sponsored-Enterprise Insured Loans [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 [Member] \| Commercial Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| 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 [Member] \| Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 [Member] \| US Government-sponsored Enterprises Debt Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 [Member] \| Other Debt And Other Equity Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 1 [Member] \| Available-for-Sale Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	35,902
Fair Value, Inputs, Level 1 [Member] \| Held-to-Maturity Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-Maturity, Fair Value	999	963
Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
FHLB and Federal Reserve Bank stocks	179,665	229,171
Life Insurance, Corporate or Bank Owned, Amount	689,000	682,649
Liabilities, Fair Value Disclosure [Abstract]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	1,853,807	1,940,194
Other Long-Term Debt	837,635	541,269
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
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	179,665	229,171
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure	646,687	33,011
Loan, Held-for-Sale, Fair Value Disclosure	32,634	90,303
Loans Receivable, Fair Value Disclosure	0	0
Life Insurance, Corporate or Bank Owned, Amount	689,000	682,649
Servicing Asset	0	0
Assets, Fair Value Disclosure	9,412,129	8,102,995
Liabilities, Fair Value Disclosure [Abstract]
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	4,276,309	4,447,479
Time Deposits	3,700,518	2,868,494
Deposits	7,976,827	7,315,973
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	470,370	326,757
Federal Home Loan Bank Borrowings, Fair Value Disclosure	1,852,685	1,944,600
Long-term Debt, Fair Value	823,991	534,983
Long-term Line of Credit	2,546	2,157
Liabilities, Fair Value Disclosure	11,304,992	10,326,755
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	0
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability		0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Lock Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	0	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	2,960	8,075
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	2,976	930
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member] \| Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	2,457	632
Foreign Currency Contract, Asset, Fair Value Disclosure	2,457	632
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	563	2,946
Foreign Currency Contracts, Liability, Fair Value Disclosure	563	2,946
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Not Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	88,541	111,623
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	170,928	195,662
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	4,315	2,954
Foreign Currency Contract, Asset, Fair Value Disclosure	4,315	2,954
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	4,106	2,746
Foreign Currency Contracts, Liability, Fair Value Disclosure	4,106	2,746
Fair Value, Inputs, Level 2 [Member] \| US Treasury Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale		0
Debt Securities, Held-to-Maturity, Fair Value	0	0
Fair Value, Inputs, Level 2 [Member] \| US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	3,005	91,817
Debt Securities, Held-to-Maturity, Fair Value	1,486,582	1,553,984
Fair Value, Inputs, Level 2 [Member] \| Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| US Government Sponsored-Enterprise Insured Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	110,928	1,120,794
Debt Securities, Held-to-Maturity, Fair Value	721,946	804,393
Fair Value, Inputs, Level 2 [Member] \| Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	4,227,727	2,042,675
Debt Securities, Held-to-Maturity, Fair Value	39,927	46,170
Fair Value, Inputs, Level 2 [Member] \| Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Mortgage-Backed Securities, Issued by Private Enterprises [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-Maturity, Fair Value	266,353	289,507
Fair Value, Inputs, Level 2 [Member] \| Commercial Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| US Government Sponsored-Enterprise Insured Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	17,000	16,937
Debt Securities, Held-to-Maturity, Fair Value	623,595	632,914
Fair Value, Inputs, Level 2 [Member] \| Commercial Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	111,475	154,793
Debt Securities, Held-to-Maturity, Fair Value	46,032	52,619
Fair Value, Inputs, Level 2 [Member] \| Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	107,839	133,975
Fair Value, Inputs, Level 2 [Member] \| US Government-sponsored Enterprises Debt Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	471	1,051
Fair Value, Inputs, Level 2 [Member] \| Other Debt And Other Equity Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	2,989	2,950
Fair Value, Inputs, Level 2 [Member] \| Available-for-Sale Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	4,581,434	3,564,990
Fair Value, Inputs, Level 2 [Member] \| Held-to-Maturity Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-Maturity, Fair Value	3,184,435	3,379,586
Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Equity Securities, FV-NI	72	24,769	$ 19,225
Loans and Leases Receivable, Net Amount	29,405,041	28,865,124
Derivative Assets	254
Liabilities, Fair Value Disclosure [Abstract]
Noninterest-bearing Domestic Deposit, Demand	5,775,657	6,119,956
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
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	72	24,769
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	0
Loans Receivable, Fair Value Disclosure	28,327,115	27,371,086
Life Insurance, Corporate or Bank Owned, Amount	0	0
Servicing Asset	87,683	84,390
Assets, Fair Value Disclosure	28,415,450	27,480,684
Liabilities, Fair Value Disclosure [Abstract]
Noninterest-bearing Domestic Deposit, Demand	5,775,657	6,119,956
Deposits, Savings Deposits	5,133,295	4,835,701
Interest-Bearing Domestic Deposit, Demand	9,124,741	8,843,967
Deposits, Money Market Deposits	6,637,915	6,330,453
Brokered CDs, Fair Value	0	0
Time Deposits	0	0
Deposits	26,671,607	26,130,076
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	26,671,607	26,130,749
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	254
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability		673
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Interest Rate Lock Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	327	439
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	0	0
Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Designated as Hedging Instrument [Member] \| Foreign Exchange Forward [Member]
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Liabilities, Fair Value Disclosure [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
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Liabilities, Fair Value Disclosure [Abstract]
Derivative Liability	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Not Designated as Hedging Instrument [Member] \| Foreign Exchange Forward [Member]
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Foreign Currency Contract, Asset, Fair Value Disclosure	0	0
Liabilities, Fair Value Disclosure [Abstract]
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Not Designated as Hedging Instrument [Member] \| Interest Rate Lock Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Assets	580	439
Fair Value, Inputs, Level 3 [Member] \| US Treasury Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale		0
Debt Securities, Held-to-Maturity, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member] \| US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Recurring [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 [Member] \| Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| US Government Sponsored-Enterprise Insured Loans [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 [Member] \| Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| 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 [Member] \| Residential Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| 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 [Member] \| Commercial Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| US Government Sponsored-Enterprise Insured Loans [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 [Member] \| Commercial Mortgage-Backed Securities [Member] \| Fair Value, Recurring [Member] \| 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 [Member] \| Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 [Member] \| US Government-sponsored Enterprises Debt Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 [Member] \| Other Debt And Other Equity Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 [Member] \| Available-for-Sale Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-sale	0	0
Fair Value, Inputs, Level 3 [Member] \| Held-to-Maturity Securities [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-Maturity, Fair Value	0	0
Fair Value, Inputs, NAV [Member] \| Fair Value, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Equity Securities, FV-NI	$ 12,500	$ 10,000

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