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Securities (Year End Securities Held to Maturity) (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | $ 1,749,337 | $ 1,945,833
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 59,907 | 107,063
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 101 | 0
Debt Securities, Held to Maturity, Estimated Fair Value | 1,809,143 | 2,052,896
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (158) | (160)
Securities held to maturity, net of allowance for credit losses of $158 in 2021 and $160 in 2020 | 1,749,179 | 1,945,673
Residential Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | 527,264 | 528,784
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 18,766 | 41,742
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Debt Securities, Held to Maturity, Estimated Fair Value | 546,030 | 570,526
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 | 0
Securities held to maturity, net of allowance for credit losses of $158 in 2021 and $160 in 2020 | 527,264 | 528,784
States and Political Subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Held to Maturity, Amortized Cost | 1,220,573 | 1,415,549
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 41,141 | 65,321
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 101 | 0
Debt Securities, Held to Maturity, Estimated Fair Value | 1,261,613 | 1,480,870
Debt Securities, Held-to-maturity, Allowance for Credit Loss | (158) | (160)
Securities held to maturity, net of allowance for credit losses of $158 in 2021 and $160 in 2020 | 1,220,415 | 1,415,389
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 | 0 | 0
Debt Securities, Held to Maturity, Estimated Fair Value | 1,500 | 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 2021 and $160 in 2020 | $ 1,500 | $ 1,500

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