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Investment Securities (Schedule Of Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,237,990 | $ 1,028,883
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 28,756 | 453
Securities Available-for-Sale, Gross Unrealized Holding Losses | 6,460 | 25,915
Debt Securities, Available-for-sale | 1,260,286 | 1,003,421
Securities Held-to-Maturity, Amortized Cost |  | 351,808
Securities Held-to-Maturity, Gross Unrecognized Holding Gains |  | 3,289
Securities Held-to-Maturity, Gross Unrecognized Holding Losses |  | 3,675
Securities held-to-maturity, fair value |  | 351,422
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 934,468 | 1,028,883
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 10,373 | 453
Securities Available-for-Sale, Gross Unrealized Holding Losses | 6,460 | 25,915
Debt Securities, Available-for-sale | 938,381 | 1,003,421
Securities Held-to-Maturity, Amortized Cost |  | 46,530
Securities Held-to-Maturity, Gross Unrecognized Holding Gains |  | 87
Securities Held-to-Maturity, Gross Unrecognized Holding Losses |  | 1,003
Securities held-to-maturity, fair value |  | 45,614
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 303,522 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 18,383 |
Debt Securities, Available-for-sale | $ 321,905 |
Securities Held-to-Maturity, Amortized Cost |  | 305,278
Securities Held-to-Maturity, Gross Unrecognized Holding Gains |  | 3,202
Securities Held-to-Maturity, Gross Unrecognized Holding Losses |  | 2,672
Securities held-to-maturity, fair value |  | $ 305,808

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Amortized cost 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 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=118942338&loc=SL82898722-210454 + Details
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