Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair value	$ 826,816	$ 1,836,592
Held to maturity, Losses less than 12 months, Gross unrealized losses	28,405	112,063
Held to maturity, Losses 12 months or longer, Fair value	1,663,078	725,298
Held to maturity, Losses 12 months or longer, Gross unrealized losses	213,094	125,808
Held to maturity, Total, Fair value	2,489,894	2,561,890
Held to maturity, Total, Gross unrealized losses	241,499	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	63,206	145,893
Held to maturity, Losses less than 12 months, Gross unrealized losses	3,175	13,245
Held to maturity, Losses 12 months or longer, Fair value	295,332	226,499
Held to maturity, Losses 12 months or longer, Gross unrealized losses	46,230	35,799
Held to maturity, Total, Fair value	358,538	372,392
Held to maturity, Total, Gross unrealized losses	49,405	49,044
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair value	429,205	560,288
Held to maturity, Losses less than 12 months, Gross unrealized losses	5,865	8,878
Held to maturity, Losses 12 months or longer, Fair value	192,626	64,346
Held to maturity, Losses 12 months or longer, Gross unrealized losses	20,696	17,680
Held to maturity, Total, Fair value	621,831	624,634
Held to maturity, Total, Gross unrealized losses	26,561	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	215,171	391,146
Held to maturity, Losses less than 12 months, Gross unrealized losses	12,457	30,515
Held to maturity, Losses 12 months or longer, Fair value	407,768	270,800
Held to maturity, Losses 12 months or longer, Gross unrealized losses	59,297	42,017
Held to maturity, Total, Fair value	622,939	661,946
Held to maturity, Total, Gross unrealized losses	71,754	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	119,234	697,827
Held to maturity, Losses less than 12 months, Gross unrealized losses	6,908	56,899
Held to maturity, Losses 12 months or longer, Fair value	731,825	163,653
Held to maturity, Losses 12 months or longer, Gross unrealized losses	84,305	30,312
Held to maturity, Total, Fair value	851,059	861,480
Held to maturity, Total, Gross unrealized losses	91,213	87,211
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to maturity, Losses less than 12 months, Fair value		41,438
Held to maturity, Losses less than 12 months, Gross unrealized losses		2,526
Held to maturity, Losses 12 months or longer, Fair value	35,527
Held to maturity, Losses 12 months or longer, Gross unrealized losses	2,566
Held to maturity, Total, Fair value	35,527	41,438
Held to maturity, Total, Gross unrealized losses	$ 2,566	$ 2,526