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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair value	$ 625,184	$ 2,475,872
Available for sale, Losses less than 12 months, Gross unrealized losses	26,989	173,301
Available for sale, Losses 12 months or longer, Fair value	4,729,305	3,007,890
Available for sale, Losses 12 months or longer, Gross unrealized losses	711,459	583,187
Available for sale, Total, Fair value	5,354,489	5,483,762
Available for sale, Total, Gross unrealized losses	738,448	756,488
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	101,949	102,607
Available for sale, Losses less than 12 months, Gross unrealized losses	1,770	754
Available for sale, Losses 12 months or longer, Fair value	7,903	8,258
Available for sale, Losses 12 months or longer, Gross unrealized losses	1,573	1,592
Available for sale, Total, Fair value	109,852	110,865
Available for sale, Total, Gross unrealized losses	3,343	2,346
Municipal Obligations [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair value	114,411	192,334
Available for sale, Losses less than 12 months, Gross unrealized losses	2,165	3,981
Available for sale, Losses 12 months or longer, Fair value	84,699
Available for sale, Losses 12 months or longer, Gross unrealized losses	2,676
Available for sale, Total, Fair value	199,110	192,334
Available for sale, Total, Gross unrealized losses	4,841	3,981
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair value	131,220	636,060
Available for sale, Losses less than 12 months, Gross unrealized losses	6,308	49,790
Available for sale, Losses 12 months or longer, Fair value	1,989,035	1,611,832
Available for sale, Losses 12 months or longer, Gross unrealized losses	374,811	348,829
Available for sale, Total, Fair value	2,120,255	2,247,892
Available for sale, Total, Gross unrealized losses	381,119	398,619
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair value	275,914	1,489,974
Available for sale, Losses less than 12 months, Gross unrealized losses	16,436	114,195
Available for sale, Losses 12 months or longer, Fair value	2,567,305	1,351,530
Available for sale, Losses 12 months or longer, Gross unrealized losses	322,989	228,685
Available for sale, Total, Fair value	2,843,219	2,841,504
Available for sale, Total, Gross unrealized losses	339,425	342,880
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-Sale [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	62,730	28,884
Available for sale, Losses 12 months or longer, Gross unrealized losses	6,043	2,967
Available for sale, Total, Fair value	62,730	70,587
Available for sale, Total, Gross unrealized losses	6,043	6,242
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Available for sale, Losses less than 12 months, Fair value	1,690	13,194
Available for sale, Losses less than 12 months, Gross unrealized losses	310	1,306
Available for sale, Losses 12 months or longer, Fair value	17,633	7,386
Available for sale, Losses 12 months or longer, Gross unrealized losses	3,367	1,114
Available for sale, Total, Fair value	19,323	20,580
Available for sale, Total, Gross unrealized losses	$ 3,677	$ 2,420

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