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Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | $ 6,238,835 | $ 6,310,214
Securities Available for Sale, Gross Unrealized Gains | 3,673 | 2,315
Securities Available for Sale, Gross Unrealized Losses | 676,888 | 756,488
Securities Available for Sale, Fair Value | 5,565,620 | 5,556,041
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 113,016 | 113,211
Securities Available for Sale, Gross Unrealized Gains | 287 |
Securities Available for Sale, Gross Unrealized Losses | 1,788 | 2,346
Securities Available for Sale, Fair Value | 111,515 | 110,865
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 206,219 | 207,014
Securities Available for Sale, Gross Unrealized Gains | 247 | 59
Securities Available for Sale, Gross Unrealized Losses | 1,997 | 3,981
Securities Available for Sale, Fair Value | 204,469 | 203,092
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 2,583,935 | 2,655,381
Securities Available for Sale, Gross Unrealized Gains | 240 | 224
Securities Available for Sale, Gross Unrealized Losses | 364,911 | 398,619
Securities Available for Sale, Fair Value | 2,219,264 | 2,256,986
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 3,239,281 | 3,234,278
Securities Available for Sale, Gross Unrealized Gains | 2,899 | 2,032
Securities Available for Sale, Gross Unrealized Losses | 299,575 | 342,880
Securities Available for Sale, Fair Value | 2,942,605 | 2,893,430
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 72,884 | 76,830
Securities Available for Sale, Gross Unrealized Losses | 5,241 | 6,242
Securities Available for Sale, Fair Value | 67,643 | 70,588
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Gross Amortized Cost | 23,500 | 23,500
Securities Available for Sale, Gross Unrealized Losses | 3,376 | 2,420
Securities Available for Sale, Fair Value | $ 20,124 | $ 21,080

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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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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