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v3.23.3

Investment Securities (Narrative) (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) Security | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) Security | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) Security
Schedule Of Investments [Line Items] |  |  |  |  |
Securities pledged as collateral | $ 786,700,000 |  | $ 786,700,000 |  | $ 850,400,000
Number of security positions, unrealized loss position | Security | 219 |  | 219 |  | 226
Number of security positions, unrealized loss position for more than 12 months | Security | 215 |  | 215 |  | 127
Securities, 12 months or longer, Fair Value | $ 853,876,000 |  | $ 853,876,000 |  | $ 760,210,000
Securities, 12 months or longer, Unrealized Losses | $ 207,291,000 |  | $ 207,291,000 |  | $ 155,102,000
Number of security positions, unrealized loss position for less than 12 months | Security | 4 |  | 4 |  | 99,000,000
Securities, Less than 12 months, Fair Value | $ 14,000 |  | $ 14,000 |  | $ 193,800,000
Securities, Less than 12 months, Unrealized Losses | 0 |  | 0 |  | 17,922,000
Available for sale securities, allowance for credit loss | 0 |  | 0 |  | 0
Securities held to maturity, Amortized Cost | 154,208,000 |  | 154,208,000 |  | 188,980,000
Investment securities, past due | 4,382,760,000 |  | 4,382,760,000 |  | 3,998,718,000
Investment securities, nonaccrual | 9,515,000 |  | 9,515,000 |  | 10,197,000
Total Past Due [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Investment securities, past due | 28,350,000 |  | 28,350,000 |  | 16,709,000
Municipal Bonds [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Securities held to maturity, Amortized Cost | 68,200,000 |  | 68,200,000 |  | 90,600,000
Internally rated held-to-maturity securities | 3,800,000 |  | 3,800,000 |  | 6,900,000
Held To Maturity Securities Non Rated | 700,000 |  | 700,000 |  |
Maximum [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Securities, 12 months or longer, Unrealized Losses | 207,300,000 |  | 207,300,000 |  | 155,100,000
Securities, Less than 12 months, Unrealized Losses | 1,000 |  | 1,000 |  |
Available for Sale Securities [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Accrued interest receivable | 1,900,000 |  | 1,900,000 |  | 2,100,000
Held To Maturity Investment Securities [Member] |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |
Accrued interest receivable | 847,000 |  | 847,000 |  | 695,000
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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