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Investment Securities (Narrative) (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) Security | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) Security | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) Security
Schedule Of Investments [Line Items] |  |  |  |  |
Securities pledged as collateral | $ 891,000,000,000 |  | $ 891,000,000,000 |  | $ 845,200,000
Proceeds from Sale of Debt Securities, Available-for-Sale |  |  | $ 0 | $ 0 |
Number of security positions, unrealized loss position | Security | 189 |  | 189 |  | 201
Number of security positions, unrealized loss position for more than 12 months | Security | 189 |  | 189 |  | 198
Securities, 12 months or longer, Fair Value | $ 871,635,000 |  | $ 871,635,000 |  | $ 835,522,000
Securities, 12 months or longer, Unrealized Losses | 160,164,000 |  | 160,164,000 |  | $ 151,546,000
Number of security positions, unrealized loss position for less than 12 months | Security |  |  |  |  | 3
Securities, Less than 12 months, Fair Value | 0 |  | 0 |  | $ 8,000
Securities, Less than 12 months, Unrealized Losses | 0 |  | 0 |  | 0
Available for sale securities, allowance for credit loss | 0 |  | 0 |  | 0
Securities held to maturity, Amortized Cost | 128,274,000 |  | 128,274,000 |  | 148,160,000
Internally rated held-to-maturity securities | $ 3,400,000 |  | $ 3,400,000 |  | $ 4,200,000
Investment, Type [Extensible Enumeration] | Municipal Bonds [Member] |  | Municipal Bonds [Member] |  | Municipal Bonds [Member]
Investment securities, past due | $ 4,461,468,000 |  | $ 4,461,468,000 |  | $ 4,462,139,000
Total Past Due [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Investment securities, past due | 16,044,000 |  | 16,044,000 |  | 29,347,000
Municipal Bonds [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Securities held to maturity, Amortized Cost | 49,400,000 |  | 49,400,000 |  | 64,600,000
Maximum [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Securities, 12 months or longer, Unrealized Losses | 160,200,000 |  | 160,200,000 |  | 151,500,000
Securities, Less than 12 months, Unrealized Losses |  |  |  |  | 1,000
Available for Sale Securities [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Accrued interest receivable | 2,100,000 |  | 2,100,000 |  |
Held To Maturity Investment Securities [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Accrued interest receivable | 559,000 |  | 559,000 |  | 571,000
Held To Maturity Investment Securities [Member] | Total Past Due [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Investment securities, past due | 0 |  | 0 |  | $ 0
Held To Maturity Investment Securities [Member] | Maximum [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Provision for credit loss | $ 1,000 | $ 1,000 | $ 1,000 | $ 1,000 |

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