Securities (Amortized Cost and Fair Value of Debt Securities Available for Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	$ 5,496,718	$ 6,310,214
Securities Available for Sale, Gross unrealized gains	11,570	2,315
Securities Available for Sale, Gross unrealized losses	593,093	756,488
Securities Available for Sale, Fair value	4,915,195	5,556,041
U.S. Treasury And Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	97,741	113,211
Securities Available for Sale, Gross unrealized gains	1,581
Securities Available for Sale, Gross unrealized losses	1,514	2,346
Securities Available for Sale, Fair value	97,808	110,865
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	203,533	207,014
Securities Available for Sale, Gross unrealized gains	79	59
Securities Available for Sale, Gross unrealized losses	2,200	3,981
Securities Available for Sale, Fair value	201,412	203,092
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	2,440,411	2,655,381
Securities Available for Sale, Gross unrealized gains	2,734	224
Securities Available for Sale, Gross unrealized losses	329,279	398,619
Securities Available for Sale, Fair value	2,113,866	2,256,986
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	2,683,872	3,234,278
Securities Available for Sale, Gross unrealized gains	7,176	2,032
Securities Available for Sale, Gross unrealized losses	253,576	342,880
Securities Available for Sale, Fair value	2,437,472	2,893,430
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	47,661	76,830
Securities Available for Sale, Gross unrealized losses	3,376	6,242
Securities Available for Sale, Fair value	44,285	70,588
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, amortized cost	23,500	23,500
Securities Available for Sale, Gross unrealized losses	3,148	2,420
Securities Available for Sale, Fair value	$ 20,352	$ 21,080

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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