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Securities (Details Textual) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Interest Receivable | $ 36,700 |  | $ 36,700 |  |
Trading | 2,612 |  | 2,612 |  | $ 2,179
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Period Increase (Decrease) |  | $ 0 |  | $ 0 |
Debt Securities, Available-for-sale | 423,478 |  | 423,478 |  | 426,424
Debt Securities, Available-for-Sale, Accrued Interest Writeoff | 0 |  | 0 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) | 0 |  | 0 |  |
Debt Securities, Available-for-sale, Realized Gain (Loss) | 0 | 0 | 0 | (1,500) |
Debt Securities, Available-for-sale, Past due | 0 |  | 0 |  |
Debt Securities, Available-for-sale, Nonaccrual | 0 |  | 0 |  |
Debt Securities, Held-to-maturity, Past Due | 0 |  | 0 |  |
Debt Securities, Held-to-maturity, Nonaccrual | 0 |  | 0 |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held |  |  |  |  | 0
Securities (Textual) [Abstract] |  |  |  |  |
Callable Securities in Investment Portfolio | 3,900 |  | 3,900 |  |
Pledged Financial Instruments, Not Separately Reported, Securities | 417,100 |  | 417,100 |  | 375,500
Investments in obligations of individual states, counties or municipalities which exceed 10% of equity | 0 |  | 0 |  | 0
Debt Securities, Held-to-maturity | 659,573 |  | 659,573 |  | 740,806
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) | 0 |  | 0 |  |
Debt Securities, Available-for-Sale, Accrued Interest Writeoff | 0 |  | 0 |  |
Debt Securities, Available-for-sale, Realized Gain (Loss) | 0 | 0 | 0 | 1,500 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Period Increase (Decrease) | 0 |  | 0 |  |
Debt Securities, Held-to-Maturity, Accrued Interest, Writeoff | 0 |  | 0 |  |
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss) | 0 | $ 0 | 0 | $ 0 |
Equity Securities, FV-NI | 21,119 |  | 21,119 |  | $ 21,261
Available-for-sale Securities [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Interest Receivable | 1,400 |  | 1,400 |  |
Held-to-maturity Securities [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Interest Receivable | $ 1,700 |  | $ 1,700 |  |

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