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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

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- Definition Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aaa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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