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Securities (Details Textual) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Interest Receivable | $ 39,400 |  | $ 33,400
Trading | 3,956 | $ 3,720 |
Debt Securities, Available-for-sale | 1,552,731 | 1,571,148 |
Debt Securities, Available-for-sale, Past due | 0 | 0 |
Investments in obligations of individual states, counties or municipalities which exceed 10% of equity | 0 | 0 |
Debt Securities, Available-for-sale, Past due | 0 | 0 |
Debt Securities, Available-for-sale, Nonaccrual | 0 | 0 |
Debt Securities, Held-to-maturity, Nonaccrual | 0 | 0 |
Securities (Textual) [Abstract] |  |  |
Callable Securities in Investment Portfolio | 26,200 |  |
Pledged Financial Instruments, Not Separately Reported, Securities | 778,700 | 740,600 |
Investments in obligations of individual states, counties or municipalities which exceed 10% of equity | 0 | 0 |
Debt Securities, Held-to-maturity | 1,282,441 | 1,066,818 |
Equity Securities, FV-NI | 22,611 | 23,173 |
Debt Securities, Held-to-maturity, 90 Days or More Past Due, Still Accruing | 0 | 0 |
Available-for-sale Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Interest Receivable | 3,400 | 3,000 |
Held-to-maturity Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Interest Receivable | $ 2,600 | $ 2,000 |

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