Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity, Losses less than 12 months, Fair Value	$ 98,160	$ 109,688
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses	338	1,291
Held to Maturity, Losses 12 months or longer, Fair Value	2,065,994	2,100,656
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	165,758	201,015
Held To Maturity Securities Unrealized Loss Position Fair Value, Total	2,164,154	2,210,344
Held to Maturity, Total, Gross Unrealized Losses	166,096	202,306
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	9,196	27,660
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses	36	840
Held to Maturity, Losses 12 months or longer, Fair Value	324,368	321,154
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	37,252	45,036
Held To Maturity Securities Unrealized Loss Position Fair Value, Total	333,564	348,814
Held to Maturity, Total, Gross Unrealized Losses	37,288	45,876
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity, Losses less than 12 months, Fair Value	88,964	82,028
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses	302	451
Held to Maturity, Losses 12 months or longer, Fair Value	468,359	497,999
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	17,093	20,416
Held To Maturity Securities Unrealized Loss Position Fair Value, Total	557,323	580,027
Held to Maturity, Total, Gross Unrealized Losses	17,395	20,867
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity, Losses less than 12 months, Fair Value		0
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses		0
Held to Maturity, Losses 12 months or longer, Fair Value	504,809	511,531
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	49,163	61,525
Held To Maturity Securities Unrealized Loss Position Fair Value, Total	504,809	511,531
Held to Maturity, Total, Gross Unrealized Losses	49,163	61,525
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity, Losses less than 12 months, Fair Value		0
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses		0
Held to Maturity, Losses 12 months or longer, Fair Value	745,658	745,750
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	61,296	72,854
Held To Maturity Securities Unrealized Loss Position Fair Value, Total	745,658	745,750
Held to Maturity, Total, Gross Unrealized Losses	61,296	72,854
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity, Losses less than 12 months, Fair Value		0
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses		0
Held to Maturity, Losses 12 months or longer, Fair Value	22,800	24,222
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	954	1,184
Held To Maturity Securities Unrealized Loss Position Fair Value, Total	22,800	24,222
Held to Maturity, Total, Gross Unrealized Losses	$ 954	$ 1,184