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Consolidated Balance Sheets (unaudited) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Cash and cash equivalents:    
Cash and due from banks $ 598,218 $ 583,375
Federal funds sold and interest-earning deposits with banks 1,972,614 2,286,928
Deposits in other financial institutions (restricted cash) 296,250 302,180
Total cash and cash equivalents 2,867,082 3,172,483
Trading securities, at fair value 117,590 110,183
Investment securities:    
Securities held to maturity (fair value of $1,684,138 and $1,732,850) 2,007,249 2,048,030
Securities available for sale, at fair value 6,530,348 6,313,756
Other investments 370,924 353,428
Total investment securities 8,908,521 8,715,214
Loans held for sale 327,935 345,343
Loans:    
Total loans 49,496,783 48,598,527
Less allowance for credit losses (585,882) (585,197)
Loans, net 48,910,901 48,013,330
Goodwill 3,094,059 3,094,059
Premises and equipment, net 993,584 994,176
Bank owned life insurance ("BOLI") 1,302,382 1,293,574
Deferred tax assets 99,555 112,578
Other real estate owned ("OREO") 26,061 8,771
Derivatives assets 191,332 222,886
Core deposit and other intangibles 364,686 386,326
Mortgage servicing rights 90,018 84,032
Other assets 685,517 644,457
Total assets 67,979,223 67,197,412
Deposits:    
Noninterest-bearing 13,650,799 13,375,697
Interest-bearing 42,224,864 41,770,100
Total deposits 55,875,663 55,145,797
Federal funds purchased 343,758 306,841
Securities sold under agreements to repurchase 299,628 311,374
Corporate and subordinated debentures 696,642 696,536
Reserve for unfunded commitments 69,229 69,619
Derivative liabilities 562,406 554,748
Other liabilities 1,100,981 1,053,389
Total liabilities 58,948,307 58,138,304
Shareholders' equity:    
Common stock - $2.50 par value; authorized 160,000,000 shares; 97,937,653 and 99,138,204 shares issued and outstanding, respectively 244,844 247,845
Surplus 6,332,285 6,480,471
Retained earnings 2,779,896 2,614,173
Accumulated other comprehensive loss (326,109) (283,381)
Total shareholders' equity 9,030,916 9,059,108
Total liabilities and shareholders' equity 67,979,223 67,197,412
Acquired - non-purchased credit deteriorated loans    
Loans:    
Total loans 10,714,489 11,232,414
Acquired - purchased credit deteriorated loans    
Loans:    
Total loans 2,818,360 2,977,499
Non-acquired loans    
Loans:    
Total loans $ 35,963,934 $ 34,388,614