Loans and Allowance for Credit Losses (Schedule of Financing Receivables Past Due) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable Investment Past Due [Line Items]
Loans	$ 23,933,527	$ 24,297,980
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	6,473,465	6,214,192
Commercial and Industrial Portfolio Segment [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	8,685,815	8,983,226
Pinnacle - municipal finance
Financing Receivable Investment Past Due [Line Items]
Loans	694,639	720,661
Franchise and equipment finance
Financing Receivable Investment Past Due [Line Items]
Loans	149,022	213,477
Mortgage warehouse lending
Financing Receivable Investment Past Due [Line Items]
Loans	626,589	585,610
1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Loans	6,310,932	6,508,922
US Government Agency Insured Loans [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	993,065	1,071,892
Current
Financing Receivable Investment Past Due [Line Items]
Loans	23,485,128	23,720,130
Current \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	6,447,178	6,145,386
Current \| Commercial and Industrial Portfolio Segment [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	8,635,670	8,911,057
Current \| Pinnacle - municipal finance
Financing Receivable Investment Past Due [Line Items]
Loans	694,639	720,661
Current \| Franchise and equipment finance
Financing Receivable Investment Past Due [Line Items]
Loans	149,022	213,477
Current \| Mortgage warehouse lending
Financing Receivable Investment Past Due [Line Items]
Loans	626,589	585,610
Current \| 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Loans	6,262,842	6,452,828
Current \| US Government Agency Insured Loans [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	669,188	691,111
30 - 59 Days Past Due
Financing Receivable Investment Past Due [Line Items]
Loans	130,664	192,399
30 - 59 Days Past Due \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	0	35,000
30 - 59 Days Past Due \| Commercial and Industrial Portfolio Segment [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	4,727	16,137
30 - 59 Days Past Due \| Pinnacle - municipal finance
Financing Receivable Investment Past Due [Line Items]
Loans	0	0
30 - 59 Days Past Due \| Franchise and equipment finance
Financing Receivable Investment Past Due [Line Items]
Loans	0	0
30 - 59 Days Past Due \| Mortgage warehouse lending
Financing Receivable Investment Past Due [Line Items]
Loans	0	0
30 - 59 Days Past Due \| 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Loans	25,892	32,975
30 - 59 Days Past Due \| US Government Agency Insured Loans [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	100,045	108,287
60 - 89 Days Past Due
Financing Receivable Investment Past Due [Line Items]
Loans	36,111	78,481
60 - 89 Days Past Due \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	0	0
60 - 89 Days Past Due \| Commercial and Industrial Portfolio Segment [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	1,253	25,645
60 - 89 Days Past Due \| Pinnacle - municipal finance
Financing Receivable Investment Past Due [Line Items]
Loans	0	0
60 - 89 Days Past Due \| Franchise and equipment finance
Financing Receivable Investment Past Due [Line Items]
Loans	0	0
60 - 89 Days Past Due \| Mortgage warehouse lending
Financing Receivable Investment Past Due [Line Items]
Loans	0	0
60 - 89 Days Past Due \| 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Loans	4,460	6,155
60 - 89 Days Past Due \| US Government Agency Insured Loans [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	30,398	46,681
90 Days or More Past Due
Financing Receivable Investment Past Due [Line Items]
Loans	281,624	306,970
90 Days or More Past Due \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	26,287	33,806
90 Days or More Past Due \| Commercial and Industrial Portfolio Segment [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	44,165	30,387
90 Days or More Past Due \| Pinnacle - municipal finance
Financing Receivable Investment Past Due [Line Items]
Loans	0	0
90 Days or More Past Due \| Franchise and equipment finance
Financing Receivable Investment Past Due [Line Items]
Loans	0	0
90 Days or More Past Due \| Mortgage warehouse lending
Financing Receivable Investment Past Due [Line Items]
Loans	0	0
90 Days or More Past Due \| 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Loans	17,738	16,964
90 Days or More Past Due \| US Government Agency Insured Loans [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	$ 193,434	$ 225,813