Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	$ 593,004	$ 2,475,872
Available for sale, Losses less than 12 months, Gross Unrealized Losses	20,343	173,301
Available for sale, Losses 12 months or longer, Fair Value	4,822,258	3,007,890
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	656,545	583,187
Available for sale, Total, Fair Value	5,415,262	5,483,762
Available for sale, Total, Gross Unrealized Losses	676,888	756,488
U.S. Treasury And Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	49,332	102,607
Available for sale, Losses less than 12 months, Gross Unrealized Losses	382	754
Available for sale, Losses 12 months or longer, Fair Value	8,070	8,258
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	1,406	1,592
Available for sale, Total, Fair Value	57,402	110,865
Available for sale, Total, Gross Unrealized Losses	1,788	2,346
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	85,570	192,334
Available for sale, Losses less than 12 months, Gross Unrealized Losses	649	3,981
Available for sale, Losses 12 months or longer, Fair Value	86,444
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	1,348
Available for sale, Total, Fair Value	172,014	192,334
Available for sale, Total, Gross Unrealized Losses	1,997	3,981
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	137,406	636,060
Available for sale, Losses less than 12 months, Gross Unrealized Losses	4,437	49,790
Available for sale, Losses 12 months or longer, Fair Value	2,071,526	1,611,832
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	360,474	348,829
Available for sale, Total, Fair Value	2,208,932	2,247,892
Available for sale, Total, Gross Unrealized Losses	364,911	398,619
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	318,876	1,489,974
Available for sale, Losses less than 12 months, Gross Unrealized Losses	14,695	114,195
Available for sale, Losses 12 months or longer, Fair Value	2,570,771	1,351,530
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	284,880	228,685
Available for sale, Total, Fair Value	2,889,647	2,841,504
Available for sale, Total, Gross Unrealized Losses	299,575	342,880
Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value		41,703
Available for sale, Losses less than 12 months, Gross Unrealized Losses		3,275
Available for sale, Losses 12 months or longer, Fair Value	67,643	28,884
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	5,241	2,967
Available for sale, Total, Fair Value	67,643	70,587
Available for sale, Total, Gross Unrealized Losses	5,241	6,242
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale, Losses less than 12 months, Fair Value	1,820	13,194
Available for sale, Losses less than 12 months, Gross Unrealized Losses	180	1,306
Available for sale, Losses 12 months or longer, Fair Value	17,804	7,386
Available for sale, Losses 12 months or longer, Gross Unrealized Losses	3,196	1,114
Available for sale, Total, Fair Value	19,624	20,580
Available for sale, Total, Gross Unrealized Losses	$ 3,376	$ 2,420

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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