Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair Value	$ 247,661	$ 686,908
Available for sale, Losses less than 12 months, Gross Unrealized Losses	1,582	8,163
Available for sale, Losses 12 months or longer, Fair Value	3,957,221	3,921,412
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	523,085	607,509
Available for sale, Total, Fair Value	4,204,882	4,608,320
Available for sale, Total, Gross Unrealized Losses	524,667	615,672
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	17,540	130,453
Available for sale, Losses less than 12 months, Gross Unrealized Losses	206	2,243
Available for sale, Losses 12 months or longer, Fair Value	7,115	7,247
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	1,445	1,651
Available for sale, Total, Fair Value	24,655	137,700
Available for sale, Total, Gross Unrealized Losses	1,651	3,894
Municipal Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair Value	18,742	24,149
Available for sale, Losses less than 12 months, Gross Unrealized Losses	127	247
Available for sale, Losses 12 months or longer, Fair Value	167,611	170,110
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	3,513	3,695
Available for sale, Total, Fair Value	186,353	194,259
Available for sale, Total, Gross Unrealized Losses	3,640	3,942
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair Value	138,747	347,772
Available for sale, Losses less than 12 months, Gross Unrealized Losses	718	2,935
Available for sale, Losses 12 months or longer, Fair Value	1,543,488	1,554,001
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	311,134	350,619
Available for sale, Total, Fair Value	1,682,235	1,901,773
Available for sale, Total, Gross Unrealized Losses	311,852	353,554
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair Value	72,632	184,534
Available for sale, Losses less than 12 months, Gross Unrealized Losses	531	2,738
Available for sale, Losses 12 months or longer, Fair Value	2,191,851	2,139,191
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	204,121	247,854
Available for sale, Total, Fair Value	2,264,483	2,323,725
Available for sale, Total, Gross Unrealized Losses	204,652	250,592
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair Value		0
Available for sale, Losses less than 12 months, Gross Unrealized Losses		0
Available for sale, Losses 12 months or longer, Fair Value	32,704	35,247
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	1,824	2,306
Available for sale, Total, Fair Value	32,704	35,247
Available for sale, Total, Gross Unrealized Losses	1,824	2,306
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair Value		0
Available for sale, Losses less than 12 months, Gross Unrealized Losses		0
Available for sale, Losses 12 months or longer, Fair Value	14,452	15,616
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	1,048	1,384
Available for sale, Total, Fair Value	14,452	15,616
Available for sale, Total, Gross Unrealized Losses	$ 1,048	$ 1,384

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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