Goodwill and Other Intangible Assets (Summary of the Gross Carrying Amount and Accumulated Amortization of Intangible Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Amortizable intangible assets:
Gross Carrying Amount	$ 74,418		$ 45,114
Accumulated Amortization	39,539		32,439
Total	34,879		12,675
Unamortizable intangible assets:
Goodwill	478,750		364,263			$ 364,263
Intangibles before servicing assets
Amortizable intangible assets:
Gross Carrying Amount	60,690		31,850
Accumulated Amortization	29,326		23,179
Total	31,364		8,671
Customer lists
Amortizable intangible assets:
Gross Carrying Amount	2,700		2,700
Accumulated Amortization	2,087		1,847
Total	613		853
Core deposit intangibles
Amortizable intangible assets:
Gross Carrying Amount	57,890		29,050
Accumulated Amortization	27,162		21,274
Total	30,728		7,776
Other intangibles
Amortizable intangible assets:
Gross Carrying Amount	100		100
Accumulated Amortization	77		58
Total	23		42
SBA servicing assets
Amortizable intangible assets:
Gross Carrying Amount	13,728		13,264
Accumulated Amortization	10,213		9,260
Total	$ 3,515	$ 3,781	$ 4,004	$ 4,391	$ 4,967	$ 5,472