Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	$ 676,638	$ 1,836,592
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	18,841	112,063
Held to maturity, Losses 12 months or longer, Fair Value	1,659,916	725,298
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	185,274	125,808
Held to maturity, Total, Fair Value	2,336,554	2,561,890
Held to maturity, Total, Gross Unrealized Losses	204,115	237,871
U.S. Treasury And Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	49,176	145,893
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	2,085	13,245
Held to maturity, Losses 12 months or longer, Fair Value	305,813	226,499
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	39,453	35,799
Held to maturity, Total, Fair Value	354,989	372,392
Held to maturity, Total, Gross Unrealized Losses	41,538	49,044
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	240,561	560,288
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	1,452	8,878
Held to maturity, Losses 12 months or longer, Fair Value	183,368	64,346
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	17,810	17,680
Held to maturity, Total, Fair Value	423,929	624,634
Held to maturity, Total, Gross Unrealized Losses	19,262	26,558
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	225,019	391,146
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	9,134	30,515
Held to maturity, Losses 12 months or longer, Fair Value	426,955	270,800
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	54,392	42,017
Held to maturity, Total, Fair Value	651,974	661,946
Held to maturity, Total, Gross Unrealized Losses	63,526	72,532
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	159,220	697,827
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	6,140	56,899
Held to maturity, Losses 12 months or longer, Fair Value	707,420	163,653
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	71,513	30,312
Held to maturity, Total, Fair Value	866,640	861,480
Held to maturity, Total, Gross Unrealized Losses	77,653	87,211
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair Value	2,662	41,438
Held to maturity, Losses less than 12 months, Gross Unrealized Losses	30	2,526
Held to maturity, Losses 12 months or longer, Fair Value	36,360
Held to maturity, Losses 12 months or longer, Gross Unrealized Losses	2,106
Held to maturity, Total, Fair Value	39,022	41,438
Held to maturity, Total, Gross Unrealized Losses	$ 2,136	$ 2,526