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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair Value	$ 2,215,103	$ 448,456
Available for sale, Losses less than 12 months, Gross Unrealized Losses	23,673	2,396
Available for sale, Losses 12 months or longer, Fair Value	2,253,030	3,778,408
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	304,709	403,006
Available for sale, Total, Fair Value	4,468,133	4,226,864
Available for sale, Total, Gross Unrealized Losses	328,382	405,402
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	11,910	17,468
Available for sale, Losses less than 12 months, Gross Unrealized Losses	101	9
Available for sale, Losses 12 months or longer, Fair Value	6,708	14,677
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	1,074	1,189
Available for sale, Total, Fair Value	18,618	32,145
Available for sale, Total, Gross Unrealized Losses	1,175	1,198
Municipal Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair Value	47,068	0
Available for sale, Losses less than 12 months, Gross Unrealized Losses	400	0
Available for sale, Losses 12 months or longer, Fair Value	95,944	124,852
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	292	508
Available for sale, Total, Fair Value	143,012	124,852
Available for sale, Total, Gross Unrealized Losses	692	508
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair Value	395,000	54,250
Available for sale, Losses less than 12 months, Gross Unrealized Losses	3,778	598
Available for sale, Losses 12 months or longer, Fair Value	1,283,981	1,442,746
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	236,538	256,396
Available for sale, Total, Fair Value	1,678,981	1,496,996
Available for sale, Total, Gross Unrealized Losses	240,316	256,994
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair Value	1,758,136	374,740
Available for sale, Losses less than 12 months, Gross Unrealized Losses	19,383	1,787
Available for sale, Losses 12 months or longer, Fair Value	829,335	2,158,865
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	64,869	143,081
Available for sale, Total, Fair Value	2,587,471	2,533,605
Available for sale, Total, Gross Unrealized Losses	84,252	144,868
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair Value	0	0
Available for sale, Losses less than 12 months, Gross Unrealized Losses	0	0
Available for sale, Losses 12 months or longer, Fair Value	23,814	25,946
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	1,184	1,154
Available for sale, Total, Fair Value	23,814	25,946
Available for sale, Total, Gross Unrealized Losses	1,184	1,154
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair Value	2,989	1,998
Available for sale, Losses less than 12 months, Gross Unrealized Losses	11	2
Available for sale, Losses 12 months or longer, Fair Value	13,248	11,322
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	752	678
Available for sale, Total, Fair Value	16,237	13,320
Available for sale, Total, Gross Unrealized Losses	$ 763	$ 680

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