Loans (Narrative) (Details) - USD ($) $ in Thousands		Mar. 31, 2026	Dec. 31, 2025
Accrued interest receivable on loans		$ 19,500	$ 20,100
Total loans	[1]	5,014,885	5,134,388
Nonaccrual loans included in past due loans		12,300	8,300
Nonaccrual loans current on payment		28,100	4,600
Residential properties in process of foreclosure		2,000	3,000
Individually analyzed loans		37,600	8,900
Collateral Dependent Individually Analyzed
Total loans		13,813	7,508
Asset Pledged as Collateral
Total loans		2,900,000	2,900,000
Commercial real estate
Total loans	[2]	2,084,804	2,183,985
Commercial real estate | Collateral Dependent Individually Analyzed
Total loans	[3]	$ 12,179	$ 5,605

[1] Includes net unamortized loan origination costs of $11.3 million and $11.0 million, respectively, at March 31, 2026 and December 31, 2025 and net unamortized premiums on loans purchased from and serviced by other financial institutions of $193 thousand and $198 thousand, respectively, at March 31, 2026 and December 31, 2025.

[2] CRE consists of commercial mortgages primarily secured by non-owner occupied income-producing property, as well as construction and development loans. Construction and development loans are made to businesses for land development or the on-site construction of industrial, commercial, or residential buildings.

[3] Secured by income-producing property.