Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	$ 3,745,002	$ 2,327,716
Available for sale, Losses less than 12 months, Gross Unrealized Losses	273,460	40,085
Available for sale, Losses 12 months or longer, Fair Value	1,857,828	1,573,943
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	307,246	67,562
Available for sale, Total, Fair Value	5,602,830	3,901,659
Available for sale, Total, Gross Unrealized Losses	580,706	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	9,064	198,318
Available for sale, Losses less than 12 months, Gross Unrealized Losses	972	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	9,064	261,852
Available for sale, Total, Gross Unrealized Losses	972	5,340
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	180,505	43,021
Available for sale, Losses less than 12 months, Gross Unrealized Losses	3,080	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	180,505	68,147
Available for sale, Total, Gross Unrealized Losses	3,080	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	1,373,018	1,293,179
Available for sale, Losses less than 12 months, Gross Unrealized Losses	101,020	20,581
Available for sale, Losses 12 months or longer, Fair Value	1,095,567	819,596
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	194,464	29,541
Available for sale, Total, Fair Value	2,468,585	2,112,775
Available for sale, Total, Gross Unrealized Losses	295,484	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	2,080,940	786,206
Available for sale, Losses less than 12 months, Gross Unrealized Losses	163,555	14,819
Available for sale, Losses 12 months or longer, Fair Value	760,822	665,687
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	112,721	33,796
Available for sale, Total, Fair Value	2,841,762	1,451,893
Available for sale, Total, Gross Unrealized Losses	276,276	48,615
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	83,038
Available for sale, Losses less than 12 months, Gross Unrealized Losses	3,771
Available for sale, Total, Fair Value	83,038
Available for sale, Total, Gross Unrealized Losses	3,771
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	18,437	6,992
Available for sale, Losses less than 12 months, Gross Unrealized Losses	1,062	8
Available for sale, Losses 12 months or longer, Fair Value	1,439
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	61
Available for sale, Total, Fair Value	19,876	6,992
Available for sale, Total, Gross Unrealized Losses	$ 1,123	$ 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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