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Borrowed Funds - Narrative (Details)
 12 Months Ended
Sep. 01, 2025
USD ($)
Dec. 31, 2025
USD ($)
subordianted_debenture
Dec. 31, 2024
USD ($)
Debt Instrument [Line Items]      
Securities available-for-sale and loans pledged as collateral   $ 7,100,000,000 $ 4,400,000,000
Total borrowed funds   788,360,000 1,519,846,000
Total available borrowing capacity from FHLB   3,900,000,000  
Qualifying collateral available for FHLB borrowings   7,500,000,000  
Interest-bearing cash on hold from dealer counterparties   33,100,000 79,600,000
Assets hold, amount   $ 23,220,372,000 11,905,326,000
Trust I      
Debt Instrument [Line Items]      
Common stock hold, percentage   100.00%  
Common stock hold, value   $ 500,000  
Assets hold, amount   $ 15,500,000  
Trust II      
Debt Instrument [Line Items]      
Common stock hold, percentage   100.00%  
Common stock hold, value   $ 200,000  
Assets hold, amount   $ 8,200,000  
Junior Subordinated Debt | Trust I      
Debt Instrument [Line Items]      
Variable interest rate spread (as a percent)   1.85%  
Period up to which interest payments can be deferred   5 years  
Junior Subordinated Debt | Trust II      
Debt Instrument [Line Items]      
Variable interest rate spread (as a percent)   1.70%  
Period up to which interest payments can be deferred   5 years  
FRB      
Debt Instrument [Line Items]      
Total borrowed funds   $ 0 0
Borrowing capacity   601,900,000  
FRB | Committed line of credit      
Debt Instrument [Line Items]      
Outstanding balance   0  
FRB | Uncommitted line of credit      
Debt Instrument [Line Items]      
Outstanding balance   0  
Subordinated debentures and notes      
Debt Instrument [Line Items]      
Total borrowed funds   $ 198,572,000 84,328,000
Subordinated debentures and notes | Subordinated Debenture, Due June 2033 And March 17, 2034      
Debt Instrument [Line Items]      
Number of subordinated debentures issued by subsidiary | subordianted_debenture   2  
Subordinated debentures and notes | Subordinated debenture maturing June 26, 2033      
Debt Instrument [Line Items]      
Principal amount   $ 5,000,000.0  
Subordinated debentures and notes | Subordinated debenture maturing June 26, 2033 | Secured Overnight Financing Rate (SOFR) Spread Adjustment      
Debt Instrument [Line Items]      
Variable interest rate spread (as a percent)   0.26%  
Subordinated debentures and notes | Subordinated debenture maturing June 26, 2033 | SOFR      
Debt Instrument [Line Items]      
Variable interest rate spread (as a percent)   3.10%  
Subordinated debentures and notes | Subordinated debenture maturing march 17, 2034      
Debt Instrument [Line Items]      
Principal amount   $ 5,000,000.0  
Subordinated debentures and notes | Subordinated debenture maturing march 17, 2034 | Secured Overnight Financing Rate (SOFR) Spread Adjustment      
Debt Instrument [Line Items]      
Variable interest rate spread (as a percent)   0.26%  
Subordinated debentures and notes | Subordinated debenture maturing march 17, 2034 | SOFR      
Debt Instrument [Line Items]      
Variable interest rate spread (as a percent)   2.79%  
Subordinated debentures and notes | Subordinated debenture maturing September 15, 2029      
Debt Instrument [Line Items]      
Total borrowed funds   $ 72,528,000 74,528,000
Principal amount   75,000,000.0  
Accretion adjustment   200,000 200,000
Capitalized financing costs   $ 400,000 $ 500,000
Subordinated debentures and notes | Subordinated debenture maturing September 15, 2029 | Secured Overnight Financing Rate (SOFR) Spread Adjustment      
Debt Instrument [Line Items]      
Variable interest rate spread (as a percent)   0.26%  
Subordinated debentures and notes | Subordinated debenture maturing September 15, 2029 | SOFR      
Debt Instrument [Line Items]      
Variable interest rate spread (as a percent)   3.32%  
Subordinated debentures and notes | Subordinated debenture maturing September 15, 2029 | Interest rate period 1      
Debt Instrument [Line Items]      
Fixed interest rate   6.00%  
Subordinated debentures and notes | Subordinated debenture maturing September 15, 2029 | Interest rate period 2 | Secured Overnight Financing Rate (SOFR) Spread Adjustment      
Debt Instrument [Line Items]      
Variable interest rate spread (as a percent)   0.26%  
Subordinated debentures and notes | Subordinated debenture maturing September 15, 2029 | Interest rate period 2 | SOFR      
Debt Instrument [Line Items]      
Variable interest rate spread (as a percent)   3.32%  
Subordinated debentures and notes | Subordinated debenture maturing June 30, 2027      
Debt Instrument [Line Items]      
Principal amount $ 100,000,000.0    
Maturity period 10 years    
Subordinated debentures and notes | Subordinated debenture maturing June 30, 2027 | Interest rate period 1      
Debt Instrument [Line Items]      
Fixed interest rate 5.50%    
Subordinated debentures and notes | Subordinated debenture maturing June 30, 2027 | Interest rate period 2      
Debt Instrument [Line Items]      
Variable interest rate spread (as a percent) 2.49%