Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	$ 6,310,214	$ 6,984,530
Securities Available for Sale, Gross Unrealized Gains	2,315	109,815
Securities Available for Sale, Gross Unrealized Losses	756,488	107,647
Securities Available for Sale, Fair Value	5,556,041	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	113,211	420,857
Securities Available for Sale, Gross Unrealized Gains		3,781
Securities Available for Sale, Gross Unrealized Losses	2,346	5,340
Securities Available for Sale, Fair Value	110,865	419,298
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	207,014	304,536
Securities Available for Sale, Gross Unrealized Gains	59	13,184
Securities Available for Sale, Gross Unrealized Losses	3,981	3,562
Securities Available for Sale, Fair Value	203,092	314,158
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	2,655,381	3,056,763
Securities Available for Sale, Gross Unrealized Gains	224	29,158
Securities Available for Sale, Gross Unrealized Losses	398,619	50,123
Securities Available for Sale, Fair Value	2,256,986	3,035,798
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	3,234,278	3,064,828
Securities Available for Sale, Gross Unrealized Gains	2,032	61,645
Securities Available for Sale, Gross Unrealized Losses	342,880	48,614
Securities Available for Sale, Fair Value	2,893,430	3,077,859
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	76,830	119,046
Securities Available for Sale, Gross Unrealized Gains		1,837
Securities Available for Sale, Gross Unrealized Losses	6,242
Securities Available for Sale, Fair Value	70,588	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	2,420	8
Securities Available for Sale, Fair Value	$ 21,080	$ 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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