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Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | $ 5,410,502 | $ 4,637,610
Securities Available for Sale, Gross Unrealized Gains | 238,559 | 52,367
Securities Available for Sale, Gross Unrealized Losses | 1,746 | 14,673
Securities Available for Sale, Fair Value | 5,647,315 | 4,675,304
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 192,077 | 98,320
Securities Available for Sale, Gross Unrealized Gains | 6,664 | 652
Securities Available for Sale, Gross Unrealized Losses | 125 | 300
Securities Available for Sale, Fair Value | 198,616 | 98,672
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 297,712 | 242,016
Securities Available for Sale, Gross Unrealized Gains | 16,291 | 7,789
Securities Available for Sale, Gross Unrealized Losses | 347 |
Securities Available for Sale, Fair Value | 313,656 | 249,805
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 2,536,999 | 1,910,909
Securities Available for Sale, Gross Unrealized Gains | 70,222 | 20,268
Securities Available for Sale, Gross Unrealized Losses | 531 | 7,020
Securities Available for Sale, Fair Value | 2,606,690 | 1,924,157
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 1,965,664 | 1,570,765
Securities Available for Sale, Gross Unrealized Gains | 136,056 | 19,880
Securities Available for Sale, Gross Unrealized Losses | 720 | 4,178
Securities Available for Sale, Fair Value | 2,101,000 | 1,586,467
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 410,050 | 807,600
Securities Available for Sale, Gross Unrealized Gains | 9,141 | 3,757
Securities Available for Sale, Gross Unrealized Losses | 21 | 3,142
Securities Available for Sale, Fair Value | 419,170 | 808,215
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 8,000 | 8,000
Securities Available for Sale, Gross Unrealized Gains | 185 | 21
Securities Available for Sale, Gross Unrealized Losses | 2 | 33
Securities Available for Sale, Fair Value | $ 8,183 | $ 7,988

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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=121645371&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=121645371&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=121645371&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=121558606&loc=SL82898722-210454 + Details
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