v3.22.4
Securities (Year End Securities Held to Maturity) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]    
Held to Maturity, Amortized Cost $ 2,639,241 $ 1,749,337
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 13,048 59,907
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 184,424 101
Debt Securities, Held to Maturity, Estimated Fair Value 2,467,865 1,809,143
Debt Securities, Held-to-maturity, Allowance for Credit Loss (158) (158)
Securities held to maturity, net of allowance for credit losses of $158 in 2022 and $158 in 2021 2,639,083 1,749,179
Residential Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Held to Maturity, Amortized Cost 526,122 527,264
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 18,766
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 65,322 0
Debt Securities, Held to Maturity, Estimated Fair Value 460,800 546,030
Debt Securities, Held-to-maturity, Allowance for Credit Loss 0 0
Securities held to maturity, net of allowance for credit losses of $158 in 2022 and $158 in 2021 526,122 527,264
States and Political Subdivisions [Member]    
Schedule of Investments [Line Items]    
Held to Maturity, Amortized Cost 2,111,619 1,220,573
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 13,048 41,141
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 119,033 101
Debt Securities, Held to Maturity, Estimated Fair Value 2,005,634 1,261,613
Debt Securities, Held-to-maturity, Allowance for Credit Loss (158) (158)
Securities held to maturity, net of allowance for credit losses of $158 in 2022 and $158 in 2021 2,111,461 1,220,415
Other [Member]    
Schedule of Investments [Line Items]    
Held to Maturity, Amortized Cost 1,500 1,500
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss 69 0
Debt Securities, Held to Maturity, Estimated Fair Value 1,431 1,500
Debt Securities, Held-to-maturity, Allowance for Credit Loss 0 0
Securities held to maturity, net of allowance for credit losses of $158 in 2022 and $158 in 2021 $ 1,500 $ 1,500