Goodwill and Other Intangible Assets (Summary of the Gross Carrying Amount and Accumulated Amortization of Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Amortizable intangible assets:
Gross Carrying Amount	$ 74,880	$ 74,656
Accumulated Amortization	43,994	41,798
Total	30,886	32,858
Unamortizable intangible assets:
Goodwill	478,750	478,750
Intangibles before servicing assets
Amortizable intangible assets:
Gross Carrying Amount	60,690	60,690
Accumulated Amortization	32,941	31,182
Total	27,749	29,508
Customer lists
Amortizable intangible assets:
Gross Carrying Amount	2,700	2,700
Accumulated Amortization	2,247	2,167
Total	453	533
Core deposit intangibles
Amortizable intangible assets:
Gross Carrying Amount	57,890	57,890
Accumulated Amortization	30,605	28,932
Total	27,285	28,958
Other intangibles
Amortizable intangible assets:
Gross Carrying Amount	100	100
Accumulated Amortization	89	83
Total	11	17
SBA servicing assets
Amortizable intangible assets:
Gross Carrying Amount	14,190	13,966
Accumulated Amortization	11,053	10,616
Total	$ 3,137	$ 3,350	$ 3,897	$ 4,004