v3.26.1
Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Fair Value Measurements [Line Items]    
Residential mortgage loans held for sale $ 3,376 $ 4,028
U.S. government and federal agency obligations 3,486,809 3,279,100
Government-sponsored enterprise obligations 43,849 44,712
State and municipal obligations 640,224 664,733
Agency mortgage-backed securities 2,602,290 3,223,105
Non-agency mortgage-backed securities 385,318 435,688
Asset-backed securities 1,002,658 1,262,045
Other debt securities 161,486 186,130
Trading debt securities 57,651 40,080
Equity securities 33,195 47,551
Private equity investments 181,033 184,343
Derivative Asset [1] 44,154 51,421
Assets held in trust for deferred compensation plan 24,569 23,276
Total assets 8,666,612 9,446,212
Derivative Liabilities [1] 16,722 18,795
Liabilities held in trust for deferred compensation plan 24,569 23,276
Total Liabilities 41,291 42,071
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value Measurements [Line Items]    
Residential mortgage loans held for sale 0 0
U.S. government and federal agency obligations 3,486,809 3,279,100
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 debt securities 8,338 13,215
Equity securities 33,195 47,551
Private equity investments 0 0
Derivative Asset [1] 0 0
Assets held in trust for deferred compensation plan 24,569 23,276
Total assets 3,552,911 3,363,142
Derivative Liabilities [1] 0 0
Liabilities held in trust for deferred compensation plan 24,569 23,276
Total Liabilities 24,569 23,276
Significant Other Observable Inputs (Level 2)    
Fair Value Measurements [Line Items]    
Residential mortgage loans held for sale 3,376 4,028
U.S. government and federal agency obligations 0 0
Government-sponsored enterprise obligations 43,849 44,712
State and municipal obligations 639,259 663,781
Agency mortgage-backed securities 2,602,290 3,223,105
Non-agency mortgage-backed securities 385,318 435,688
Asset-backed securities 1,002,658 1,262,045
Other debt securities 161,486 186,130
Trading debt securities 49,313 26,865
Equity securities 0 0
Private equity investments 0 0
Derivative Asset [1] 43,978 51,232
Assets held in trust for deferred compensation plan 0 0
Total assets 4,931,527 5,897,586
Derivative Liabilities [1] 16,692 18,718
Liabilities held in trust for deferred compensation plan 0 0
Total Liabilities 16,692 18,718
Significant Unobservable Inputs (Level 3)    
Fair Value Measurements [Line Items]    
Residential mortgage loans held for sale 0 0
U.S. government and federal agency obligations 0 0
Government-sponsored enterprise obligations 0 0
State and municipal obligations 965 952
Agency mortgage-backed securities 0 0
Non-agency mortgage-backed securities 0 0
Asset-backed securities 0 0
Other debt securities 0 0
Trading debt securities 0 0
Equity securities 0 0
Private equity investments 181,033 184,343
Derivative Asset [1] 176 189
Assets held in trust for deferred compensation plan 0 0
Total assets 182,174 185,484
Derivative Liabilities [1] 30 77
Liabilities held in trust for deferred compensation plan 0 0
Total Liabilities $ 30 $ 77
[1]
* The fair value of each class of derivative is shown in Note 12.