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Securities (Proceeds, Gross Realized Gains and Tax Expense) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Proceeds from sales, available-for-sale debt securities | $ 177,917 | $ 223,763 | $ 484,380 | $ 375,102
Gross realized gains, available-for-sale debt securities | 9,640 | 1,447 | 11,169 | 3,008
Related tax expense, available-for-sale debt securities | $ 2,850 | $ 428 | $ 3,302 | $ 889

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- Definition Amount of realized gain on 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 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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