Loans (Narrative) (Details) - USD ($) $ in Thousands		Dec. 31, 2025	Dec. 31, 2024
Accrued interest receivable		$ 20,100	$ 22,100
Nonaccrual loans included in past due loans		8,300	6,400
Nonaccrual loans current on payment		4,600	16,900
Residential loans in process of foreclosure		3,000	1,000
Individually analyzed loans		8,900	16,600
Collateral dependent individually analyzed loans	[1]	5,134,388	5,137,838
Asset Pledged as Collateral
Collateral dependent individually analyzed loans		2,900,000	2,800,000
Collateral Dependent Individually Analyzed
Collateral dependent individually analyzed loans		$ 7,508	$ 11,591

[1] Includes net unamortized loan origination costs of $11.0 million and $10.9 million, respectively, at December 31, 2025 and 2024 and net unamortized premiums on loans purchased from and serviced by other financial institutions of $198 thousand and $242 thousand, respectively, at December 31, 2025 and 2024.