Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair value	$ 99,040	$ 52,894
Available for sale, Losses less than 12 months, Gross unrealized losses	442	399
Available for sale, Losses 12 months or longer, Fair value	4,157,272	4,223,749
Available for sale, Losses 12 months or longer, Gross unrealized losses	634,340	592,694
Available for sale, Total, Fair value	4,256,312	4,276,643
Available for sale, Total, Gross unrealized losses	634,782	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	11,973
Available for sale, Losses less than 12 months, Gross unrealized losses	27
Available for sale, Losses 12 months or longer, Fair value	7,460	7,790
Available for sale, Losses 12 months or longer, Gross unrealized losses	1,643	1,514
Available for sale, Total, Fair value	19,433	7,790
Available for sale, Total, Gross unrealized losses	1,670	1,514
Municipal Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair value	19,549	49,832
Available for sale, Losses less than 12 months, Gross unrealized losses	118	374
Available for sale, Losses 12 months or longer, Fair value	176,664	128,965
Available for sale, Losses 12 months or longer, Gross unrealized losses	3,612	1,826
Available for sale, Total, Fair value	196,213	178,797
Available for sale, Total, Gross unrealized losses	3,730	2,200
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair value	31,818	3,062
Available for sale, Losses less than 12 months, Gross unrealized losses	86	25
Available for sale, Losses 12 months or longer, Fair value	1,717,118	1,795,154
Available for sale, Losses 12 months or longer, Gross unrealized losses	356,958	329,254
Available for sale, Total, Fair value	1,748,936	1,798,216
Available for sale, Total, Gross unrealized losses	357,044	329,279
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair value	35,700
Available for sale, Losses less than 12 months, Gross unrealized losses	211
Available for sale, Losses 12 months or longer, Fair value	2,195,760	2,227,703
Available for sale, Losses 12 months or longer, Gross unrealized losses	265,667	253,576
Available for sale, Total, Fair value	2,231,460	2,227,703
Available for sale, Total, Gross unrealized losses	265,878	253,576
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses 12 months or longer, Fair value	41,873	44,285
Available for sale, Losses 12 months or longer, Gross unrealized losses	3,357	3,376
Available for sale, Total, Fair value	41,873	44,285
Available for sale, Total, Gross unrealized losses	3,357	3,376
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses 12 months or longer, Fair value	18,397	19,852
Available for sale, Losses 12 months or longer, Gross unrealized losses	3,103	3,148
Available for sale, Total, Fair value	18,397	19,852
Available for sale, Total, Gross unrealized losses	$ 3,103	$ 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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