Loans and Allowance for Credit Losses (Schedule of Collateral Dependent Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
C&I
Financing Receivable, Impaired [Line Items]
Amortized Cost	$ 8,572,160	$ 9,029,475
Franchise and equipment finance
Financing Receivable, Impaired [Line Items]
Amortized Cost	59,342	102,746
1-4 single family residential
Financing Receivable, Impaired [Line Items]
Amortized Cost	5,774,390	6,091,959
Secured Debt
Financing Receivable, Impaired [Line Items]
Amortized Cost	171,277	285,232
Extent to Which Secured by Collateral	131,166	256,943
Secured Debt \| CRE
Financing Receivable, Impaired [Line Items]
Amortized Cost	35,659	112,494
Secured Debt \| Commercial Real Estate \| CRE
Financing Receivable, Impaired [Line Items]
Extent to Which Secured by Collateral	35,236	112,071
Secured Debt \| C&I
Financing Receivable, Impaired [Line Items]
Amortized Cost	134,688	170,222
Secured Debt \| C&I \| Commercial and industrial
Financing Receivable, Impaired [Line Items]
Extent to Which Secured by Collateral	95,000	142,356
Secured Debt \| Franchise and equipment finance
Financing Receivable, Impaired [Line Items]
Amortized Cost	930	2,516
Secured Debt \| Franchise and equipment finance \| Franchise and equipment finance
Financing Receivable, Impaired [Line Items]
Extent to Which Secured by Collateral	$ 930	$ 2,516