Derivative and Hedging Activities, Derivative Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Dec. 31, 2024
Derivative Instrument Detail [Abstract]
Derivative Liability, Notional Amount	$ 50,000
Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	37,112	$ 42,468
Derivative Liability, Subject to Master Netting Arrangement, before Offset	(16,831)	23,006
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	11,708	12,839
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset	(11,708)	12,839
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset	10,170	10,343
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset	(3,197)	8,334
Derivative Asset	15,234	19,286
Derivative Liability	(1,926)	1,833
Other Assets [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	65,368	80,606
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	11,708	12,839
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset	10,170	10,343
Derivative Asset	43,490	57,424
Other Liabilities [Member]
Derivative Instrument Detail [Abstract]
Derivative Liability, Subject to Master Netting Arrangement, before Offset	104,133	110,787
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset	11,708	12,839
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset	3,197	8,334
Derivative Liability	89,228	89,614
Designated as Hedging Instrument | Other Assets [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	5,080	11,274
Designated as Hedging Instrument | Other Assets [Member] | Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Asset, Notional Amount	1,650,000	2,425,000
Designated as Hedging Instrument | Other Assets [Member] | Foreign Exchange Forward [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset, Notional Amount	43,857	280,159
Designated as Hedging Instrument | Other Liabilities [Member]
Derivative Instrument Detail [Abstract]
Derivative Liability, Subject to Master Netting Arrangement, before Offset	2,728	195
Designated as Hedging Instrument | Other Liabilities [Member] | Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Liability, Notional Amount	850,000	25,000
Designated as Hedging Instrument | Other Liabilities [Member] | Foreign Exchange Forward [Member]
Derivative Instrument Detail [Abstract]
Derivative Liability, Notional Amount	260,905	38,384
Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	60,288	69,332
Not Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Asset, Notional Amount	5,970,070	4,775,818
Not Designated as Hedging Instrument [Member] | Other Assets [Member] | Foreign Exchange Forward [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset, Notional Amount	60,812	48,904
Not Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest Rate Lock Commitments [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset, Notional Amount	73,415	39,998
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivative Instrument Detail [Abstract]
Derivative Liability, Subject to Master Netting Arrangement, before Offset	101,405	110,592
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Liability, Notional Amount	6,022,235	7,072,274
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Foreign Exchange Forward [Member]
Derivative Instrument Detail [Abstract]
Derivative Liability, Notional Amount	12,197	43,787
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Forward Commitments to Sell Residential Mortgage Loans
Derivative Instrument Detail [Abstract]
Derivative Liability, Notional Amount	146,000	107,000
Fair Value, Inputs, Level 2
Derivative Instrument Detail [Abstract]
Derivative Liability, Notional Amount	100
Fair Value, Measurements, Recurring | Interest Rate Lock Commitments [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset	1,777	814
Fair Value, Measurements, Recurring | Designated as Hedging Instrument | Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Asset	4,253	10,517
Derivative Liability	2,326	1
Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument [Member] | Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Asset	58,177	66,787
Derivative Liability	101,284	108,631
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign Exchange Forward [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset	334	1,731
Derivative Liability	121	1,517
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest Rate Lock Commitments [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Designated as Hedging Instrument | Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Asset	4,253	10,517
Derivative Liability	2,326	1
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Designated as Hedging Instrument | Foreign Exchange Forward [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset	827	757
Derivative Liability	402	194
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Not Designated as Hedging Instrument [Member] | Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Asset	58,177	66,787
Derivative Liability	101,284	108,631
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Derivative Financial Instruments, Assets [Member]
Derivative Instrument Detail [Abstract]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	1,777	814	$ 327
Fair Value, Net Derivative Asset (Liability) Measured On Recurring Basis With Unobservable Inputs - Forward Commitments	900	(400)
Fair Value, Net Derivative Asset (Liability) Measured On Recurring Basis With Unobservable Inputs - Interest Rate Lock Commitements	800	800
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Interest Rate Lock Commitments [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset	1,777	814
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Designated as Hedging Instrument | Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Asset	0	0
Derivative Liability	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Not Designated as Hedging Instrument [Member] | Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Asset	0	0
Derivative Liability	0	0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset	1,777	814
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Not Designated as Hedging Instrument [Member] | Forward Commitments to Sell Residential Mortgage Loans
Derivative Instrument Detail [Abstract]
Derivative Liability	$ 0	$ 444