Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	$ 2,241,804	$ 332,659
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	120,967	1,929
Held to maturity, Losses 12 months or longer, Fair Value	122,646	11,837
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	17,214	464
Held to maturity, Total, Fair Value	2,364,450	344,496
Held to maturity, Total, Gross Unrealized Losses	138,181	2,393
U.S. Treasury And Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	274,813	14,837
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	21,723	20
Held to maturity, Losses 12 months or longer, Fair Value	66,290
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	6,977
Held to maturity, Total, Fair Value	341,103	14,837
Held to maturity, Total, Gross Unrealized Losses	28,700	20
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	418,484	7,795
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	10,931	205
Held to maturity, Losses 12 months or longer, Fair Value	39,761
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	7,186
Held to maturity, Total, Fair Value	458,245	7,795
Held to maturity, Total, Gross Unrealized Losses	18,117	205
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	653,358	253,661
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	42,184	1,499
Held to maturity, Losses 12 months or longer, Fair Value	6,181
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	1,182
Held to maturity, Total, Fair Value	659,539	253,661
Held to maturity, Total, Gross Unrealized Losses	43,366	1,499
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	843,698	56,366
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	44,795	205
Held to maturity, Losses 12 months or longer, Fair Value	10,414	11,837
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	1,869	464
Held to maturity, Total, Fair Value	854,112	68,203
Held to maturity, Total, Gross Unrealized Losses	46,664	$ 669
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	51,451
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	1,334
Held to maturity, Total, Fair Value	51,451
Held to maturity, Total, Gross Unrealized Losses	$ 1,334

Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.

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-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563

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