Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	$ 2,899,532	$ 2,327,716
Available for sale, Losses less than 12 months, Gross Unrealized Losses	301,222	40,085
Available for sale, Losses 12 months or longer, Fair Value	2,557,754	1,573,943
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	574,651	67,562
Available for sale, Total, Fair Value	5,457,286	3,901,659
Available for sale, Total, Gross Unrealized Losses	875,873	107,647
U.S. Treasury And Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	42,288	198,318
Available for sale, Losses less than 12 months, Gross Unrealized Losses	2,194	2,305
Available for sale, Losses 12 months or longer, Fair Value		63,534
Available for sale, Losses 12 months or longer, Gross Unrealized Losses		3,035
Available for sale, Total, Fair Value	42,288	261,852
Available for sale, Total, Gross Unrealized Losses	2,194	5,340
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	196,102	43,021
Available for sale, Losses less than 12 months, Gross Unrealized Losses	10,147	2,372
Available for sale, Losses 12 months or longer, Fair Value		25,126
Available for sale, Losses 12 months or longer, Gross Unrealized Losses		1,190
Available for sale, Total, Fair Value	196,102	68,147
Available for sale, Total, Gross Unrealized Losses	10,147	3,562
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	763,658	1,293,179
Available for sale, Losses less than 12 months, Gross Unrealized Losses	76,195	20,581
Available for sale, Losses 12 months or longer, Fair Value	1,535,412	819,596
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	355,285	29,541
Available for sale, Total, Fair Value	2,299,070	2,112,775
Available for sale, Total, Gross Unrealized Losses	431,480	50,122
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	1,803,019	786,206
Available for sale, Losses less than 12 months, Gross Unrealized Losses	204,268	14,819
Available for sale, Losses 12 months or longer, Fair Value	1,020,901	665,687
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	219,307	33,796
Available for sale, Total, Fair Value	2,823,920	1,451,893
Available for sale, Total, Gross Unrealized Losses	423,575	48,615
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	75,089
Available for sale, Losses less than 12 months, Gross Unrealized Losses	6,294
Available for sale, Total, Fair Value	75,089
Available for sale, Total, Gross Unrealized Losses	6,294
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	19,376	6,992
Available for sale, Losses less than 12 months, Gross Unrealized Losses	2,124	8
Available for sale, Losses 12 months or longer, Fair Value	1,441
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	59
Available for sale, Total, Fair Value	20,817	6,992
Available for sale, Total, Gross Unrealized Losses	$ 2,183	$ 8

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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-Name Accounting Standards Codification
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