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Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages Held-for-sale, Fair Value Disclosure $ 39,396,000 $ 9,181,000
U.S. government and federal agency obligations 838,059,000 851,776,000
Government-sponsored enterprise obligations 54,485,000 139,277,000
State and municipal obligations 2,045,099,000 1,267,927,000
Agency mortgage-backed securities 6,712,085,000 3,937,964,000
Non-agency mortgage-backed securities 361,074,000 809,782,000
Asset-backed securities 1,882,243,000 1,233,489,000
Other debt securities 556,219,000 331,411,000
Trading securities 35,321,000 28,161,000
Equity securities with readily determinable fair values 2,966,000 2,929,000
Private equity investments 94,368,000 94,122,000
Derivative Assets [1] 89,889,000 105,674,000
Deferred Compensation Plan Assets 19,278,000 16,518,000
Total Assets 12,730,482,000 8,828,211,000
Derivative Liability [1] 18,675,000 10,219,000
Deferred Compensation Liability, Current and Noncurrent 19,278,000 16,518,000
Total liabilities 37,953,000 26,737,000
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages Held-for-sale, Fair Value Disclosure 0 0
U.S. government and federal agency obligations 838,059,000 851,776,000
Government-sponsored enterprise obligations 0 0
State and municipal obligations 0 0
Agency mortgage-backed securities 0 0
Non-agency mortgage-backed securities 0 0
Asset-backed securities 0 0
Other debt securities 0 0
Trading securities 0 0
Equity securities with readily determinable fair values 2,966,000 2,929,000
Private equity investments 0 0
Derivative Assets [1] 0 0
Deferred Compensation Plan Assets 19,278,000 16,518,000
Total Assets 860,303,000 871,223,000
Derivative Liability [1] 0 0
Deferred Compensation Liability, Current and Noncurrent 19,278,000 16,518,000
Total liabilities 19,278,000 16,518,000
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages Held-for-sale, Fair Value Disclosure 39,396,000 9,181,000
U.S. government and federal agency obligations 0 0
Government-sponsored enterprise obligations 54,485,000 139,277,000
State and municipal obligations 2,037,131,000 1,258,074,000
Agency mortgage-backed securities 6,712,085,000 3,937,964,000
Non-agency mortgage-backed securities 361,074,000 809,782,000
Asset-backed securities 1,882,243,000 1,233,489,000
Other debt securities 556,219,000 331,411,000
Trading securities 35,321,000 28,161,000
Equity securities with readily determinable fair values 0 0
Private equity investments 0 0
Derivative Assets [1] 86,447,000 105,075,000
Deferred Compensation Plan Assets 0 0
Total Assets 11,764,401,000 7,852,414,000
Derivative Liability [1] 17,974,000 9,989,000
Deferred Compensation Liability, Current and Noncurrent 0 0
Total liabilities 17,974,000 9,989,000
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages Held-for-sale, Fair Value Disclosure 0 0
U.S. government and federal agency obligations 0 0
Government-sponsored enterprise obligations 0 0
State and municipal obligations 7,968,000 9,853,000
Agency mortgage-backed securities 0 0
Non-agency mortgage-backed securities 0 0
Asset-backed securities 0 0
Other debt securities 0 0
Trading securities 0 0
Equity securities with readily determinable fair values 0 0
Private equity investments 94,368,000 94,122,000
Derivative Assets [1] 3,442,000 599,000
Deferred Compensation Plan Assets 0 0
Total Assets 105,778,000 104,574,000
Derivative Liability [1] 701,000 230,000
Deferred Compensation Liability, Current and Noncurrent 0 0
Total liabilities $ 701,000 $ 230,000
[1] The fair value of each class of derivative is shown in Note 19.