Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	$ 6,984,530	$ 5,766,234
Securities Available for Sale, Gross Unrealized Gains	109,815	236,826
Securities Available for Sale, Gross Unrealized Losses	107,647	3,733
Securities Available for Sale, Fair Value	6,986,698	5,999,327
U.S. Treasury And Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	420,857	207,365
Securities Available for Sale, Gross Unrealized Gains	3,781	6,289
Securities Available for Sale, Gross Unrealized Losses	5,340	284
Securities Available for Sale, Fair Value	419,298	213,370
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	304,536	309,342
Securities Available for Sale, Gross Unrealized Gains	13,184	17,536
Securities Available for Sale, Gross Unrealized Losses	3,562	153
Securities Available for Sale, Fair Value	314,158	326,725
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	3,056,763	2,560,249
Securities Available for Sale, Gross Unrealized Gains	29,158	69,570
Securities Available for Sale, Gross Unrealized Losses	50,123	8
Securities Available for Sale, Fair Value	3,035,798	2,629,811
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	3,064,828	2,323,306
Securities Available for Sale, Gross Unrealized Gains	61,645	135,516
Securities Available for Sale, Gross Unrealized Losses	48,614	3,288
Securities Available for Sale, Fair Value	3,077,859	2,455,534
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	119,046	354,472
Securities Available for Sale, Gross Unrealized Gains	1,837	7,651
Securities Available for Sale, Fair Value	120,883	362,123
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available for Sale, Gross Amortized Cost	18,500	11,500
Securities Available for Sale, Gross Unrealized Gains	210	264
Securities Available for Sale, Gross Unrealized Losses	8
Securities Available for Sale, Fair Value	$ 18,702	$ 11,764

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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Amount 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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