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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair Value	$ 35,303	$ 686,908
Available for sale, Losses less than 12 months, Gross Unrealized Losses	115	8,163
Available for sale, Losses 12 months or longer, Fair Value	3,972,389	3,921,412
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	436,250	607,509
Available for sale, Total, Fair Value	4,007,692	4,608,320
Available for sale, Total, Gross Unrealized Losses	436,365	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	32,243	130,453
Available for sale, Losses less than 12 months, Gross Unrealized Losses	109	2,243
Available for sale, Losses 12 months or longer, Fair Value	14,382	7,247
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	1,485	1,651
Available for sale, Total, Fair Value	46,625	137,700
Available for sale, Total, Gross Unrealized Losses	1,594	3,894
Municipal Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair Value	0	24,149
Available for sale, Losses less than 12 months, Gross Unrealized Losses	0	247
Available for sale, Losses 12 months or longer, Fair Value	133,878	170,110
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	728	3,695
Available for sale, Total, Fair Value	133,878	194,259
Available for sale, Total, Gross Unrealized Losses	728	3,942
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair Value	37	347,772
Available for sale, Losses less than 12 months, Gross Unrealized Losses	0	2,935
Available for sale, Losses 12 months or longer, Fair Value	1,515,716	1,554,001
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	272,605	350,619
Available for sale, Total, Fair Value	1,515,753	1,901,773
Available for sale, Total, Gross Unrealized Losses	272,605	353,554
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair Value	1,023	184,534
Available for sale, Losses less than 12 months, Gross Unrealized Losses	6	2,738
Available for sale, Losses 12 months or longer, Fair Value	2,265,794	2,139,191
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	159,148	247,854
Available for sale, Total, Fair Value	2,266,817	2,323,725
Available for sale, Total, Gross Unrealized Losses	159,154	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	28,029	35,247
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	1,374	2,306
Available for sale, Total, Fair Value	28,029	35,247
Available for sale, Total, Gross Unrealized Losses	1,374	2,306
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair Value	2,000	0
Available for sale, Losses less than 12 months, Gross Unrealized Losses	0	0
Available for sale, Losses 12 months or longer, Fair Value	14,590	15,616
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	910	1,384
Available for sale, Total, Fair Value	16,590	15,616
Available for sale, Total, Gross Unrealized Losses	$ 910	$ 1,384

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