Loans (Narrative) (Details) - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
Accrued interest receivable on loans		$ 22,000	$ 17,600
Total loans	[1]	5,611,115	5,110,139
Nonaccrual loans included in past due loans		5,700	7,200
Nonaccrual loans with no ACL		15,800	6,500
Nonaccrual loans current on payment		27,900	5,700
Residential loans in process of foreclosure		803	2,900
Individually analyzed loans		24,400	10,000
Asset Pledged as Collateral
Total loans		3,000,000	2,400,000
Collateral Dependent Individually Analyzed
Total loans		$ 24,437	$ 8,455

[1] Includes net unamortized loan origination costs of $12.8 million and $11.6 million, respectively, at September 30, 2023 and December 31, 2022 and net unamortized premiums on loans purchased from and serviced by other financial institutions of $296 thousand and $318 thousand, respectively, at September 30, 2023 and December 31, 2022.