Fair Value Measurements, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Assets, Fair Value Disclosure [Abstract]
Cash and Due from Banks	$ 521,323	$ 544,059
Interest-bearing Deposits in Banks and Other Financial Institutions	711,033	453,590
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	105	21,955
Debt Securities, Available-for-Sale	4,796,570	4,581,434
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	3,705,857	3,738,747
Debt Securities, Held-to-Maturity, Fair Value	3,174,170	3,185,494
Equity Securities, FV-NI and without Readily Determinable Fair Value	23,331	23,242
FHLB and Federal Reserve Bank stocks	194,244	179,665
Loans and Leases Receivable, Net Amount	29,922,780	29,405,041
Life Insurance, Corporate or Bank Owned, Amount	690,551	689,000
Assets	43,309,136	43,023,068
Liabilities, Fair Value Disclosure
Noninterest-bearing Domestic Deposit, Demand	6,135,946	5,775,657
Deposits	35,196,713	34,648,434
Federal Funds Purchased and Securities Sold under Agreements to Repurchase	311,335	470,369
Short-Term Debt	311,335	470,369
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	2,027,297	1,853,807
Other Long-Term Debt	591,382	837,635
Liabilities	38,622,578	38,417,506
Standby Letters of Credit [Member]
Liabilities, Fair Value Disclosure
Lending Related Commitments	260,000	254,000
Interest Rate Contract
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	28,112	31,950
Liabilities, Fair Value Disclosure
Derivative Liability	2,298	1,452
Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Cash and Due from Banks	521,323	544,059
Interest-bearing Deposits in Banks and Other Financial Institutions	711,033	453,590
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	105	21,955
Equity Securities, FV-NI	10,831	10,742
Equity Securities, FV-NI and without Readily Determinable Fair Value	23,331	23,242
FHLB and Federal Reserve Bank stocks	194,244	179,665
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure	47,611	646,687
Loan, Held-for-Sale, Fair Value Disclosure	7,910	32,634
Loans and Leases Receivable, Net Amount	29,895,996	29,373,557
Loans Receivable, Fair Value Disclosure	29,057,135	28,327,115
Life Insurance, Corporate or Bank Owned, Amount	690,551	689,000
Servicing Asset	86,251	87,683
Assets	40,775,509	40,471,048
Assets, Fair Value Disclosure	39,404,961	38,871,352
Liabilities, Fair Value Disclosure
Noninterest-bearing Domestic Deposit, Demand	6,135,946	5,775,657
Deposits, Savings Deposits	5,247,291	5,133,295
Interest-Bearing Domestic Deposit, Demand	9,075,133	9,124,741
Deposits, Money Market Deposits	6,820,038	6,637,915
Brokered CDs, Carrying Amount	4,197,512	4,276,309
Brokered CDs, Fair Value	4,197,512	4,276,309
Time Deposits, at Carrying Value	3,720,793	3,700,518
Time Deposits	3,720,793	3,700,518
Deposits	35,196,713	34,648,434
Federal Funds Purchased and Securities Sold under Agreements to Repurchase	311,335	470,369
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	311,336	470,370
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	2,027,297	1,853,807
Federal Home Loan Bank Borrowings, Fair Value Disclosure	2,026,570	1,852,685
Other Long-Term Debt	591,382	837,635
Long-term Debt, Fair Value	591,715	823,991
Long-Term Line of Credit	2,628	2,546
Liabilities	38,268,772	37,991,364
Liabilities, Fair Value Disclosure	38,268,377	37,976,599
Fair Value, Measurements, Recurring | Interest Rate Lock Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	988	327
Fair Value, Measurements, Recurring | Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset		254
Liabilities, Fair Value Disclosure
Derivative Liability	583
Fair Value, Measurements, Recurring | Designated as Hedging Instrument | Interest Rate Contract
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	8,813	2,960
Liabilities, Fair Value Disclosure
Derivative Liability	418	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	1,460	2,457
Liabilities, Fair Value Disclosure
Foreign Currency Contracts, Liability, Fair Value Disclosure	115	563
Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument [Member] | Interest Rate Contract
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	81,446	88,541
Liabilities, Fair Value Disclosure
Derivative Liability	136,453	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	2,085	4,315
Liabilities, Fair Value Disclosure
Foreign Currency Contracts, Liability, Fair Value Disclosure	1,846	4,106
US Treasury Securities
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	994	1,000
Debt Securities, Held-to-Maturity, Fair Value	1,009	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	994	1,000
Debt Securities, Held-to-Maturity, Fair Value	1,009	999
US States and Political Subdivisions Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-Sale	2,995	3,005
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,649,045	1,659,722
Debt Securities, Held-to-Maturity, Fair Value	1,454,805	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	2,995	3,005
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,648,981	1,659,662
Debt Securities, Held-to-Maturity, Fair Value	1,454,742	1,486,582
Residential Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-Sale	118,036	110,928
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	871,331	885,476
Debt Securities, Held-to-Maturity, Fair Value	723,822	721,946
Residential Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-Sale	4,438,964	4,227,727
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	42,972	43,693
Debt Securities, Held-to-Maturity, Fair Value	39,977	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	118,036	110,928
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	871,331	885,476
Debt Securities, Held-to-Maturity, Fair Value	723,822	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	4,438,964	4,227,727
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	42,972	43,693
Debt Securities, Held-to-Maturity, Fair Value	39,977	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	320,057	324,182
Debt Securities, Held-to-Maturity, Fair Value	268,201	266,353
Commercial Mortgage-Backed Securities [Member] | US Government Sponsored-Enterprise Insured Loans
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-Sale	16,959	17,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	770,177	772,456
Debt Securities, Held-to-Maturity, Fair Value	640,734	623,595
Commercial Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-Sale	111,433	111,475
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	51,281	52,219
Debt Securities, Held-to-Maturity, Fair Value	45,621	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	16,959	17,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	770,177	772,456
Debt Securities, Held-to-Maturity, Fair Value	640,734	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	111,433	111,475
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	51,281	52,219
Debt Securities, Held-to-Maturity, Fair Value	45,621	46,032
Federal Family Education Loan Program (FFELP) Guaranteed Loans [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-Sale	104,774	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	104,774	107,839
US Government-sponsored Enterprises Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-Sale	410	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	410	471
Other Debt Obligations | Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-Sale	2,999	2,989
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-Sale	4,796,570	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	3,705,793	3,738,687
Debt Securities, Held-to-Maturity, Fair Value	3,174,106	3,185,434
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Cash and Due from Banks	521,323	544,059
Interest-bearing Deposits in Banks and Other Financial Institutions	711,033	453,590
Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell, Fair Value Disclosure	105	21,955
Equity Securities, FV-NI	10,760	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	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	1,244,229	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	1,009	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	1,009	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	194,244	179,665
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure	47,611	646,687
Loan, Held-for-Sale, Fair Value Disclosure	7,910	32,634
Loans Receivable, Fair Value Disclosure	0	0
Life Insurance, Corporate or Bank Owned, Amount	690,551	689,000
Servicing Asset	0	0
Assets, Fair Value Disclosure	9,003,788	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	4,197,512	4,276,309
Time Deposits	3,720,793	3,700,518
Deposits	7,918,305	7,976,827
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure	311,336	470,370
Federal Home Loan Bank Borrowings, Fair Value Disclosure	2,026,570	1,852,685
Long-term Debt, Fair Value	591,715	823,991
Long-Term Line of Credit	2,628	2,546
Liabilities, Fair Value Disclosure	10,989,386	11,304,992
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	2,085	4,315
Liabilities, Fair Value Disclosure
Derivative Liability	1,846	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	8,813	2,960
Liabilities, Fair Value Disclosure
Derivative Liability	418	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	1,460	2,457
Foreign Currency Contract, Asset, Fair Value Disclosure	1,460	2,457
Liabilities, Fair Value Disclosure
Derivative Liability	115	563
Foreign Currency Contracts, Liability, Fair Value Disclosure	115	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	81,446	88,541
Liabilities, Fair Value Disclosure
Derivative Liability	136,453	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	2,085	4,315
Liabilities, Fair Value Disclosure
Foreign Currency Contracts, Liability, Fair Value Disclosure	1,846	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	2,995	3,005
Debt Securities, Held-to-Maturity, Fair Value	1,454,742	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	118,036	110,928
Debt Securities, Held-to-Maturity, Fair Value	723,822	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	4,438,964	4,227,727
Debt Securities, Held-to-Maturity, Fair Value	39,977	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	268,201	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	16,959	17,000
Debt Securities, Held-to-Maturity, Fair Value	640,734	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	111,433	111,475
Debt Securities, Held-to-Maturity, Fair Value	45,621	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	104,774	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	410	471
Fair Value, Inputs, Level 2 | Other Debt Obligations | Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Debt Securities, Available-for-Sale	2,999	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	4,796,570	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	3,173,098	3,184,435
Fair Value, Inputs, Level 3
Assets, Fair Value Disclosure [Abstract]
Equity Securities, FV-NI	71	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	71	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	0
Loans Receivable, Fair Value Disclosure	29,057,135	28,327,115
Life Insurance, Corporate or Bank Owned, Amount	0	0
Servicing Asset	86,251	87,683
Assets, Fair Value Disclosure	29,144,444	28,415,450
Liabilities, Fair Value Disclosure
Noninterest-bearing Domestic Deposit, Demand	6,135,946	5,775,657
Deposits, Savings Deposits	5,247,291	5,133,295
Interest-Bearing Domestic Deposit, Demand	9,075,133	9,124,741
Deposits, Money Market Deposits	6,820,038	6,637,915
Brokered CDs, Fair Value	0	0
Time Deposits	0	0
Deposits	27,278,408	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	27,278,991	26,671,607
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Interest Rate Lock Commitments [Member]
Assets, Fair Value Disclosure [Abstract]
Derivative Asset	988	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	583
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	988	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	$ 12,500	$ 12,500