Segment Information (Summary of Certain Operating Information For Reportable Segments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net interest income	$ 1,495,362	$ 1,124,957	$ 1,039,907
Provision for credit losses	78,589	(59,263)	214,220
Non-interest income	461,053	586,120	604,189
Non-interest expense	1,177,271	1,132,544	1,040,095
Income tax expense	190,873	171,645	96,791
Net income	509,682	466,151	292,990
Total assets at end of year	52,949,649	50,142,143	45,080,768
Operating Segments
Segment Reporting Information [Line Items]
Net interest income	1,465,183	1,098,374	1,016,080
Provision for credit losses	78,589	(59,263)	214,220
Non-interest income	520,882	647,471	658,893
Non-interest expense	1,206,921	1,167,312	1,070,972
Income tax expense	190,873	171,645	96,791
Net income	509,682	466,151	292,990
Total assets at end of year	52,949,649	50,142,143	45,080,768
Operating Segments | Community Banking
Segment Reporting Information [Line Items]
Net interest income	1,180,198	868,477	808,443
Provision for credit losses	74,184	(60,309)	206,774
Non-interest income	298,572	422,698	469,187
Non-interest expense	926,298	912,296	855,797
Income tax expense	128,939	120,092	51,439
Net income	349,349	319,096	163,620
Total assets at end of year	41,368,200	40,253,818	36,769,640
Operating Segments | Specialty Finance
Segment Reporting Information [Line Items]
Net interest income	246,681	197,958	177,025
Provision for credit losses	4,405	1,046	7,446
Non-interest income	97,701	95,822	86,268
Non-interest expense	172,784	143,526	118,560
Income tax expense	46,286	40,040	36,956
Net income	120,907	109,168	100,331
Total assets at end of year	9,826,254	8,382,722	7,015,590
Operating Segments | Wealth Management
Segment Reporting Information [Line Items]
Net interest income	38,304	31,939	30,612
Provision for credit losses	0	0	0
Non-interest income	124,609	128,951	103,438
Non-interest expense	107,839	111,490	96,615
Income tax expense	15,648	11,513	8,396
Net income	39,426	37,887	29,039
Total assets at end of year	1,755,195	1,505,603	1,295,538
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net interest income	30,179	26,583	23,827
Provision for credit losses	0	0	0
Non-interest income	(59,829)	(61,351)	(54,704)
Non-interest expense	(29,650)	(34,768)	(30,877)
Income tax expense	0	0	0
Net income	0	0	0
Total assets at end of year	$ 0	$ 0	$ 0