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Securities (Details Textual) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Interest Receivable | $ 33,400 |  | $ 25,900
Trading | 3,269 | $ 2,838 |
Debt Securities, Available-for-sale | 600,213 | 412,860 |
Debt Securities, Held-to-maturity, Past Due | 0 | 0 |
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, Past Due | 0 | 0 |
Debt Securities, Held-to-maturity, Nonaccrual | 0 | 0 |
Securities (Textual) [Abstract] |  |  |
Callable Securities in Investment Portfolio | 3,300 |  |
Pledged Financial Instruments, Not Separately Reported, Securities | 420,200 | 419,600 |
Investments in obligations of individual states, counties or municipalities which exceed 10% of equity | 0 | 0 |
Debt Securities, Held-to-maturity | 805,529 | 724,512 |
Equity Securities, FV-NI | 22,419 | 22,107 |
Available-for-sale Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Interest Receivable | 2,000 | 1,200 |
Held-to-maturity Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Interest Receivable | $ 1,600 | $ 1,500 |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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