Loans (Narrative) (Details) - USD ($) $ in Thousands		Mar. 31, 2025	Dec. 31, 2024
Accrued interest receivable on loans		$ 20,800	$ 22,100
Total loans	[1]	5,096,210	5,137,838
Nonaccrual loans included in past due loans		7,400	6,400
Nonaccrual loans current on payment		14,300	16,900
Residential properties in process of foreclosure		1,300	1,000
Individually analyzed loans		16,200	16,600
Collateral Dependent Individually Analyzed
Total loans		11,194	11,591
Asset Pledged as Collateral
Total loans		$ 2,800,000	$ 2,800,000

[1] Includes net unamortized loan origination costs of $11.3 million and $10.9 million, respectively, at March 31, 2025 and December 31, 2024 and net unamortized premiums on loans purchased from and serviced by other financial institutions of $233 thousand and $242 thousand, respectively, at March 31, 2025 and December 31, 2024.