Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	$ 3,301,410	$ 2,327,716
Available for sale, Losses less than 12 months, Gross Unrealized Losses	161,570	40,085
Available for sale, Losses 12 months or longer, Fair Value	1,997,511	1,573,943
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	234,121	67,562
Available for sale, Total, Fair Value	5,298,921	3,901,659
Available for sale, Total, Gross Unrealized Losses	395,691	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	9,631	198,318
Available for sale, Losses less than 12 months, Gross Unrealized Losses	406	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	9,631	261,852
Available for sale, Total, Gross Unrealized Losses	406	5,340
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	63,349	43,021
Available for sale, Losses less than 12 months, Gross Unrealized Losses	519	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	63,349	68,147
Available for sale, Total, Gross Unrealized Losses	519	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	1,359,065	1,293,179
Available for sale, Losses less than 12 months, Gross Unrealized Losses	65,035	20,581
Available for sale, Losses 12 months or longer, Fair Value	1,195,222	819,596
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	128,076	29,541
Available for sale, Total, Fair Value	2,554,287	2,112,775
Available for sale, Total, Gross Unrealized Losses	193,111	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	1,762,250	786,206
Available for sale, Losses less than 12 months, Gross Unrealized Losses	91,931	14,819
Available for sale, Losses 12 months or longer, Fair Value	802,289	665,687
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	106,045	33,796
Available for sale, Total, Fair Value	2,564,539	1,451,893
Available for sale, Total, Gross Unrealized Losses	197,976	48,615
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	91,220
Available for sale, Losses less than 12 months, Gross Unrealized Losses	3,074
Available for sale, Total, Fair Value	91,220
Available for sale, Total, Gross Unrealized Losses	3,074
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	15,895	6,992
Available for sale, Losses less than 12 months, Gross Unrealized Losses	605	8
Available for sale, Total, Fair Value	15,895	6,992
Available for sale, Total, Gross Unrealized Losses	$ 605	$ 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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