Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	$ 2,327,716	$ 514,805
Available for sale, Losses less than 12 months, Gross Unrealized Losses	40,085	3,727
Available for sale, Losses 12 months or longer, Fair Value	1,573,943	760
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	67,562	6
Available for sale, Total, Fair Value	3,901,659	515,565
Available for sale, Total, Gross Unrealized Losses	107,647	3,733
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	198,318	35,845
Available for sale, Losses less than 12 months, Gross Unrealized Losses	2,305	284
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	261,852	35,845
Available for sale, Total, Gross Unrealized Losses	5,340	284
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	43,021	30,170
Available for sale, Losses less than 12 months, Gross Unrealized Losses	2,372	153
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	68,147	30,170
Available for sale, Total, Gross Unrealized Losses	3,562	153
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	1,293,179	530
Available for sale, Losses less than 12 months, Gross Unrealized Losses	20,581	2
Available for sale, Losses 12 months or longer, Fair Value	819,596	760
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	29,541	6
Available for sale, Total, Fair Value	2,112,775	1,290
Available for sale, Total, Gross Unrealized Losses	50,122	8
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	786,206	446,190
Available for sale, Losses less than 12 months, Gross Unrealized Losses	14,819	3,288
Available for sale, Losses 12 months or longer, Fair Value	665,687
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	33,796
Available for sale, Total, Fair Value	1,451,893	446,190
Available for sale, Total, Gross Unrealized Losses	48,615	3,288
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value		70
Available for sale, Total, Fair Value		70
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	6,992	2,000
Available for sale, Losses less than 12 months, Gross Unrealized Losses	8
Available for sale, Total, Fair Value	6,992	$ 2,000
Available for sale, Total, Gross Unrealized Losses	$ 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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