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Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | $ 6,943,511 | $ 5,766,234
Securities Available for Sale, Gross Unrealized Gains | 143,513 | 236,826
Securities Available for Sale, Gross Unrealized Losses | 86,103 | 3,733
Securities Available for Sale, Fair Value | 7,000,921 | 5,999,327
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 394,069 | 207,365
Securities Available for Sale, Gross Unrealized Gains | 4,822 | 6,289
Securities Available for Sale, Gross Unrealized Losses | 4,169 | 284
Securities Available for Sale, Fair Value | 394,722 | 213,370
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 305,701 | 309,342
Securities Available for Sale, Gross Unrealized Gains | 13,504 | 17,536
Securities Available for Sale, Gross Unrealized Losses | 3,178 | 153
Securities Available for Sale, Fair Value | 316,027 | 326,725
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 3,256,700 | 2,560,249
Securities Available for Sale, Gross Unrealized Gains | 39,681 | 69,570
Securities Available for Sale, Gross Unrealized Losses | 42,988 | 8
Securities Available for Sale, Fair Value | 3,253,393 | 2,629,811
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 2,838,584 | 2,323,306
Securities Available for Sale, Gross Unrealized Gains | 81,615 | 135,516
Securities Available for Sale, Gross Unrealized Losses | 35,766 | 3,288
Securities Available for Sale, Fair Value | 2,884,433 | 2,455,534
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 133,957 | 354,472
Securities Available for Sale, Gross Unrealized Gains | 3,628 | 7,651
Securities Available for Sale, Fair Value | 137,585 | 362,123
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 14,500 | 11,500
Securities Available for Sale, Gross Unrealized Gains | 263 | 264
Securities Available for Sale, Gross Unrealized Losses | 2 |
Securities Available for Sale, Fair Value | $ 14,761 | $ 11,764

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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=123581744&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=123581744&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=123581744&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=124258926&loc=SL82898722-210454 + Details
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