Loans and Allowance for Credit Losses (Schedule of Financing Receivables Past Due) (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Financing Receivable Investment Past Due [Line Items]
Loans	$ 23,929,073	$ 24,273,707
CRE
Financing Receivable Investment Past Due [Line Items]
Loans	7,006,901	6,810,871
C&I
Financing Receivable Investment Past Due [Line Items]
Loans	8,681,166	9,029,475
Pinnacle - municipal finance
Financing Receivable Investment Past Due [Line Items]
Loans	636,945	619,374
Franchise and equipment finance
Financing Receivable Investment Past Due [Line Items]
Loans	71,740	102,746
Mortgage warehouse lending
Financing Receivable Investment Past Due [Line Items]
Loans	876,771	728,241
1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Loans	5,807,912	6,091,959
US Government Agency Insured Loans [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	847,638	891,041
Current
Financing Receivable Investment Past Due [Line Items]
Loans	23,485,731	23,738,618
Current \| CRE
Financing Receivable Investment Past Due [Line Items]
Loans	7,000,817	6,768,897
Current \| C&I
Financing Receivable Investment Past Due [Line Items]
Loans	8,593,333	8,893,254
Current \| Pinnacle - municipal finance
Financing Receivable Investment Past Due [Line Items]
Loans	636,945	619,374
Current \| Franchise and equipment finance
Financing Receivable Investment Past Due [Line Items]
Loans	71,637	102,746
Current \| Mortgage warehouse lending
Financing Receivable Investment Past Due [Line Items]
Loans	876,771	728,241
Current \| 1-4 single family residential
Financing Receivable Investment Past Due [Line Items]
Loans	5,742,182	6,021,772
Current \| US Government Agency Insured Loans [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	564,046	604,334
30 - 59 Days Past Due
Financing Receivable Investment Past Due [Line Items]
Loans	142,358	156,658
30 - 59 Days Past Due \| CRE
Financing Receivable Investment Past Due [Line Items]
Loans	0	751
30 - 59 Days Past Due \| C&I
Financing Receivable Investment Past Due [Line Items]
Loans	23,846	6,136
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	39,911	48,099
30 - 59 Days Past Due \| US Government Agency Insured Loans [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	78,601	101,672
60 - 89 Days Past Due
Financing Receivable Investment Past Due [Line Items]
Loans	45,734	93,972
60 - 89 Days Past Due \| CRE
Financing Receivable Investment Past Due [Line Items]
Loans	0	14,867
60 - 89 Days Past Due \| C&I
Financing Receivable Investment Past Due [Line Items]
Loans	8,828	48,711
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	103	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	7,189	4,468
60 - 89 Days Past Due \| US Government Agency Insured Loans [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	29,614	25,926
90 Days or More Past Due
Financing Receivable Investment Past Due [Line Items]
Loans	255,250	284,459
90 Days or More Past Due \| CRE
Financing Receivable Investment Past Due [Line Items]
Loans	6,084	26,356
90 Days or More Past Due \| C&I
Financing Receivable Investment Past Due [Line Items]
Loans	55,159	81,374
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	18,630	17,620
90 Days or More Past Due \| US Government Agency Insured Loans [Member]
Financing Receivable Investment Past Due [Line Items]
Loans	$ 175,377	$ 159,109