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Investment Securities (Narrative) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) Security | Dec. 31, 2022 USD ($) Security
Schedule Of Investments [Line Items] |  |
Securities pledged as collateral | $ 845,200,000 | $ 850,400,000
Number of security positions, unrealized loss position | Security | 201 | 226
Number of security positions, unrealized loss position for more than 12 months | Security | 198 | 127
Securities, 12 months or longer, Fair Value | $ 835,522,000 | $ 760,210,000
Securities, 12 months or longer, Unrealized Losses | $ 151,546,000 | $ 155,102,000
Number of security positions, unrealized loss position for less than 12 months | Security | 3 | 99
Securities, Less than 12 months, Fair Value | $ 8,000 | $ 193,800,000
Securities, Less than 12 months, Unrealized Losses | 0 | 17,922,000
Available for sale securities, allowance for credit loss | 0 |
Securities held to maturity, Amortized Cost | $ 148,160,000 | $ 188,980,000
Investment, Type [Extensible Enumeration] | Municipal Bonds [Member] | Municipal Bonds [Member]
Investment securities, past due | $ 4,416,251,000 | $ 3,998,718,000
Impairment on securities | 0 |
Municipal Bonds [Member] |  |
Schedule Of Investments [Line Items] |  |
Securities held to maturity, Amortized Cost | 64,600,000 | 90,600,000
Internally rated held-to-maturity securities | 4,200,000 | 6,900,000
Maximum [Member] |  |
Schedule Of Investments [Line Items] |  |
Securities, Less than 12 months, Unrealized Losses | 1,000 |
Total Past Due [Member] |  |
Schedule Of Investments [Line Items] |  |
Investment securities, past due | 29,347,000 | 16,709,000
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 | 571,000 | 695,000
Credit Loss Benefit Expense | 1,000 |
Held To Maturity Investment Securities [Member] | Maximum [Member] |  |
Schedule Of Investments [Line Items] |  |
Credit Loss Benefit Expense |  | $ 1,000
Held To Maturity Investment Securities [Member] | Total Past Due [Member] |  |
Schedule Of Investments [Line Items] |  |
Investment securities, past due | $ 0 |

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