Loans (Narrative) (Details) - USD ($) $ in Thousands		Dec. 31, 2024	Dec. 31, 2023
Net unamortized loan origination costs		$ 10,900	$ 13,000
Net unamortized premiums on purchased loans		242	286
Accrued interest receivable		22,100	22,900
Nonaccrual loans included in past due loans		6,400	6,900
Nonaccrual loans current on payment		16,900	37,700
Residential loans in process of foreclosure		1,000	960
Individually analyzed loans		16,600	34,600
Collateral dependent individually analyzed loans	[1]	5,137,838	5,647,706
Asset Pledged as Collateral
Collateral dependent individually analyzed loans		2,800,000	3,400,000
Collateral Dependent Individually Analyzed [Member]
Collateral dependent individually analyzed loans		$ 11,591	$ 34,640

[1] Includes net unamortized loan origination costs of $10.9 million and $13.0 million, respectively, at December 31, 2024 and 2023 and net unamortized premiums on loans purchased from and serviced by other financial institutions of $242 thousand and $286 thousand, respectively, at December 31, 2024 and 2023.