Borrowings - Narrative (Details)	1 Months Ended	12 Months Ended
	Jun. 30, 2021 USD ($)	Dec. 31, 2025 USD ($) line_of_credit	Dec. 31, 2024 USD ($) line_of_credit	Dec. 31, 2007 USD ($) security
Debt Instrument [Line Items]
Loans pledged		$ 3,600,000,000	$ 2,100,000,000
Remaining borrowing capacity		1,900,000,000	1,200,000,000
Naming applicable municipalities as beneficiaries		260,100,000	157,700,000
Loans receivable		6,493,740,000	4,608,956,000
Unamortized debt issuance costs		100,000	400,000
Open Repo borrowing at an interest rate of 3.93% and 4.71% at December 31, 2025 and December 31, 2024. The maximum amount of the Open Repo borrowing available is $250,000.
Debt Instrument [Line Items]
Federal home loan balance		$ 250,000,000	$ 250,000,000
Commitment term		364 days
Federal Reserve Bank Advances | Federal Reserve Borrower In Custody Program
Debt Instrument [Line Items]
Federal home loan balance		$ 201,200,000
Federal Reserve Bank Advances | Federal Reserve Borrower In Custody Program | Qualifying loans pledged as collateral
Debt Instrument [Line Items]
Loans pledged		62,300,000
Loans receivable		$ 211,800,000
Subordinated Debt
Debt Instrument [Line Items]
Number of preferred trust securities | security				2
Floating rate trust preferred securities				$ 10,000,000.0
Debt Instrument, Interest Rate, Effective Percentage		5.53%	6.17%
Trust preferred securities, interest payment deferment period		5 years
Subordinated Debt | Notes Maturing In June 2031
Debt Instrument [Line Items]
Floating rate trust preferred securities	$ 85,000,000.0
Interest rate, percentage	3.25%
Proceeds from issuance of subordinated long-term debt	$ 83,500,000
Subordinated Debt | SOFR
Debt Instrument [Line Items]
Line of credit, basis spread on variable rate (percent)		1.55%
Credit spread adjustment (percent)		0.26161%
Subordinated Debt | SOFR | Notes Maturing In June 2031
Debt Instrument [Line Items]
Line of credit, basis spread on variable rate (percent)		2.58%
Subordinated Debt | LIBOR
Debt Instrument [Line Items]
Line of credit, basis spread on variable rate (percent)		1.55%
Line of Credit | Overnight Borrowing Agreements
Debt Instrument [Line Items]
Line of credit, outstanding amount		$ 0	$ 0
Line of Credit | Unsecured Debt
Debt Instrument [Line Items]
Number of unsecured lines of credit issued | line_of_credit		1	1
Pledge on certain loan amount		$ 10,000,000	$ 10,000,000
Line of credit, outstanding amount		$ 0	$ 0
Line of Credit | Unsecured Debt | SOFR
Debt Instrument [Line Items]
Line of credit, basis spread on variable rate (percent)		2.85%