Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	$ 6,342,379	$ 6,984,530
Securities Available for Sale, Gross Unrealized Gains	337	109,815
Securities Available for Sale, Gross Unrealized Losses	875,873	107,647
Securities Available for Sale, Fair Value	5,466,843	6,986,698
U.S. Treasury And Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	44,481	420,857
Securities Available for Sale, Gross Unrealized Gains		3,781
Securities Available for Sale, Gross Unrealized Losses	2,194	5,340
Securities Available for Sale, Fair Value	42,287	419,298
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	207,941	304,536
Securities Available for Sale, Gross Unrealized Gains	71	13,184
Securities Available for Sale, Gross Unrealized Losses	10,147	3,562
Securities Available for Sale, Fair Value	197,865	314,158
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	2,737,579	3,056,763
Securities Available for Sale, Gross Unrealized Gains	266	29,158
Securities Available for Sale, Gross Unrealized Losses	431,480	50,123
Securities Available for Sale, Fair Value	2,306,365	3,035,798
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	3,247,495	3,064,828
Securities Available for Sale, Gross Unrealized Gains		61,645
Securities Available for Sale, Gross Unrealized Losses	423,575	48,614
Securities Available for Sale, Fair Value	2,823,920	3,077,859
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	81,383	119,046
Securities Available for Sale, Gross Unrealized Gains		1,837
Securities Available for Sale, Gross Unrealized Losses	6,294
Securities Available for Sale, Fair Value	75,089	120,883
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	23,500	18,500
Securities Available for Sale, Gross Unrealized Gains		210
Securities Available for Sale, Gross Unrealized Losses	2,183	8
Securities Available for Sale, Fair Value	$ 21,317	$ 18,702

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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