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Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | $ 2,780,990 | $ 2,852,495
Securities Held to Maturity, Gross unrealized gains | 765 | 774
Securities Held to Maturity, Gross unrealized losses | 241,499 | 237,871
Securities Held to Maturity, Fair value | 2,540,256 | 2,615,398
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | 422,789 | 426,454
Securities Held to Maturity, Gross unrealized gains | 96 | 21
Securities Held to Maturity, Gross unrealized losses | 49,405 | 49,044
Securities Held to Maturity, Fair value | 373,480 | 377,431
Municipal Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | 683,143 | 698,908
Securities Held to Maturity, Gross unrealized gains | 669 | 753
Securities Held to Maturity, Gross unrealized losses | 26,561 | 26,558
Securities Held to Maturity, Fair value | 657,251 | 673,103
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | 694,693 | 734,478
Securities Held to Maturity, Gross unrealized losses | 71,754 | 72,532
Securities Held to Maturity, Fair value | 622,939 | 661,946
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | 942,272 | 948,691
Securities Held to Maturity, Gross unrealized losses | 91,213 | 87,211
Securities Held to Maturity, Fair value | 851,059 | 861,480
Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities Held to Maturity, Gross Amortized cost | 38,093 | 43,964
Securities Held to Maturity, Gross unrealized losses | 2,566 | 2,526
Securities Held to Maturity, Fair value | $ 35,527 | $ 41,438

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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5A Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5A Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 + Details
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