Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair value	$ 581,552	$ 52,894
Available for sale, Losses less than 12 months, Gross unrealized losses	2,591	399
Available for sale, Losses 12 months or longer, Fair value	4,085,096	4,223,749
Available for sale, Losses 12 months or longer, Gross unrealized losses	641,322	592,694
Available for sale, Total, Fair value	4,666,648	4,276,643
Available for sale, Total, Gross unrealized losses	643,913	593,093
U.S. Treasury And Government Agency Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair value	77,053
Available for sale, Losses less than 12 months, Gross unrealized losses	98
Available for sale, Losses 12 months or longer, Fair value	7,442	7,790
Available for sale, Losses 12 months or longer, Gross unrealized losses	1,659	1,514
Available for sale, Total, Fair value	84,495	7,790
Available for sale, Total, Gross unrealized losses	1,757	1,514
Municipal Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair value	21,941	49,832
Available for sale, Losses less than 12 months, Gross unrealized losses	400	374
Available for sale, Losses 12 months or longer, Fair value	174,531	128,965
Available for sale, Losses 12 months or longer, Gross unrealized losses	5,022	1,826
Available for sale, Total, Fair value	196,472	178,797
Available for sale, Total, Gross unrealized losses	5,422	2,200
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair value	397,674	3,062
Available for sale, Losses less than 12 months, Gross unrealized losses	1,359	25
Available for sale, Losses 12 months or longer, Fair value	1,656,654	1,795,154
Available for sale, Losses 12 months or longer, Gross unrealized losses	360,549	329,254
Available for sale, Total, Fair value	2,054,328	1,798,216
Available for sale, Total, Gross unrealized losses	361,908	329,279
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair value	82,884
Available for sale, Losses less than 12 months, Gross unrealized losses	734
Available for sale, Losses 12 months or longer, Fair value	2,188,381	2,227,703
Available for sale, Losses 12 months or longer, Gross unrealized losses	268,205	253,576
Available for sale, Total, Fair value	2,271,265	2,227,703
Available for sale, Total, Gross unrealized losses	268,939	253,576
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses 12 months or longer, Fair value	39,353	44,285
Available for sale, Losses 12 months or longer, Gross unrealized losses	3,122	3,376
Available for sale, Total, Fair value	39,353	44,285
Available for sale, Total, Gross unrealized losses	3,122	3,376
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair value	2,000
Available for sale, Losses 12 months or longer, Fair value	18,735	19,852
Available for sale, Losses 12 months or longer, Gross unrealized losses	2,765	3,148
Available for sale, Total, Fair value	20,735	19,852
Available for sale, Total, Gross unrealized losses	$ 2,765	$ 3,148

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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