Loans (Narrative) (Details) - USD ($) $ in Thousands		Sep. 30, 2024	Dec. 31, 2023
Accrued interest receivable on loans		$ 22,600	$ 22,900
Total loans	[1]	5,514,870	5,647,706
Nonaccrual loans included in past due loans		18,100	6,900
Nonaccrual loans current on payment		13,000	37,700
Residential loans in process of foreclosure		2,400	960
Individually analyzed loans		19,900	34,600
Asset Pledged as Collateral
Total loans		$ 3,300,000	$ 3,400,000

[1] Includes net unamortized loan origination costs of $13.4 million and $13.0 million, respectively, at September 30, 2024 and December 31, 2023 and net unamortized premiums on loans purchased from and serviced by other financial institutions of $249 thousand and $286 thousand, respectively, at September 30, 2024 and December 31, 2023.