Derivative and Hedging Activities, Derivative Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Derivative Instrument Detail [Abstract]
Derivative Asset, Notional Amount	$ 550,000	$ 100,000
Derivative Liability, Notional Amount	50,000	300,000
Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	48,495	79,807
Derivative Liability, Subject to Master Netting Arrangement, before Offset	25,348	14,369
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	15,132	12,667
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset	15,132	12,667
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset	12,922	35,190
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset	6,960	250
Derivative Asset	20,441	31,950
Derivative Liability	3,256	1,452
Other Assets [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	90,842	98,854
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	15,132	12,667
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset	12,922	35,190
Derivative Asset	62,788	50,997
Other Liabilities [Member]
Derivative Instrument Detail [Abstract]
Derivative Liability, Subject to Master Netting Arrangement, before Offset	114,564	178,573
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset	15,132	12,667
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset	6,960	250
Derivative Liability	92,472	165,656
Designated as Hedging Instrument | Other Assets [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	12,013	5,418
Designated as Hedging Instrument | Other Assets [Member] | Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Asset, Notional Amount	2,900,000	1,950,000
Designated as Hedging Instrument | Other Assets [Member] | Foreign Exchange Forward [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset, Notional Amount	186,363	127,518
Designated as Hedging Instrument | Other Liabilities [Member]
Derivative Instrument Detail [Abstract]
Derivative Liability, Subject to Master Netting Arrangement, before Offset	912	3,539
Designated as Hedging Instrument | Other Liabilities [Member] | Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Liability, Notional Amount	150,000	1,150,000
Designated as Hedging Instrument | Other Liabilities [Member] | Foreign Exchange Forward [Member]
Derivative Instrument Detail [Abstract]
Derivative Liability, Notional Amount	253,556	216,665
Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset, Subject to Master Netting Arrangement, before Offset	78,829	93,436
Not Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Asset, Notional Amount	5,068,235	3,858,867
Not Designated as Hedging Instrument [Member] | Other Assets [Member] | Foreign Exchange Forward [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset, Notional Amount	85,329	68,028
Not Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest Rate Lock Commitments [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset, Notional Amount	63,721	28,580
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivative Instrument Detail [Abstract]
Derivative Liability, Subject to Master Netting Arrangement, before Offset	113,652	175,034
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Liability, Notional Amount	6,225,864	6,992,894
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Foreign Exchange Forward [Member]
Derivative Instrument Detail [Abstract]
Derivative Liability, Notional Amount	88,149	74,199
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Forward Commitments to Sell Residential Mortgage Loans
Derivative Instrument Detail [Abstract]
Derivative Liability, Notional Amount	134,996	85,000
Fair Value, Inputs, Level 2
Derivative Instrument Detail [Abstract]
Derivative Asset, Notional Amount	3,300	300
Derivative Liability, Notional Amount	0	1,400
Fair Value, Measurements, Recurring | Interest Rate Lock Commitments [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset	1,129	327
Fair Value, Measurements, Recurring | Designated as Hedging Instrument | Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Asset	11,063	2,960
Derivative Liability	46	2,976
Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument [Member] | Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Asset	74,500	88,541
Derivative Liability	110,250	170,928
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign Exchange Forward [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset	3,200	4,315
Derivative Liability	2,952	4,106
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	11,063	2,960
Derivative Liability	46	2,976
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Designated as Hedging Instrument | Foreign Exchange Forward [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset	949	2,457
Derivative Liability	866	563
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Not Designated as Hedging Instrument [Member] | Interest Rate Contract
Derivative Instrument Detail [Abstract]
Derivative Asset	74,500	88,541
Derivative Liability	110,250	170,928
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	1,129	327	$ 439
Fair Value, Net Derivative Asset (Liability) Measured On Recurring Basis With Unobservable Inputs - Forward Commitments		300
Fair Value, Net Derivative Asset (Liability) Measured On Recurring Basis With Unobservable Inputs - Interest Rate Lock Commitements		300
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Interest Rate Lock Commitments [Member]
Derivative Instrument Detail [Abstract]
Derivative Asset	1,129	327
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	1,129	580
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	$ 450	$ 0