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Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |
Securities available for sale, amortized cost | $ 6,151,183 | $ 6,310,214
Securities Available for Sale, Gross unrealized gains | 1,954 | 2,315
Securities Available for Sale, Gross unrealized losses | 738,448 | 756,488
Securities Available for Sale, Fair value | 5,414,689 | 5,556,041
U.S. Treasury And Government Agency Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities available for sale, amortized cost | 113,195 | 113,211
Securities Available for Sale, Gross unrealized losses | 3,343 | 2,346
Securities Available for Sale, Fair value | 109,852 | 110,865
Municipal Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities available for sale, amortized cost | 205,306 | 207,014
Securities Available for Sale, Gross unrealized gains | 40 | 59
Securities Available for Sale, Gross unrealized losses | 4,841 | 3,981
Securities Available for Sale, Fair value | 200,505 | 203,092
Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities available for sale, amortized cost | 2,507,541 | 2,655,381
Securities Available for Sale, Gross unrealized gains | 141 | 224
Securities Available for Sale, Gross unrealized losses | 381,119 | 398,619
Securities Available for Sale, Fair value | 2,126,563 | 2,256,986
Commercial Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities available for sale, amortized cost | 3,232,868 | 3,234,278
Securities Available for Sale, Gross unrealized gains | 1,773 | 2,032
Securities Available for Sale, Gross unrealized losses | 339,425 | 342,880
Securities Available for Sale, Fair value | 2,895,216 | 2,893,430
Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities available for sale, amortized cost | 68,773 | 76,830
Securities Available for Sale, Gross unrealized gains |  |
Securities Available for Sale, Gross unrealized losses | 6,043 | 6,242
Securities Available for Sale, Fair value | 62,730 | 70,588
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities available for sale, amortized cost | 23,500 | 23,500
Securities Available for Sale, Gross unrealized gains |  |
Securities Available for Sale, Gross unrealized losses | 3,677 | 2,420
Securities Available for Sale, Fair value | $ 19,823 | $ 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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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