Securities (Securities Held to Maturity with Unrealized Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity, Losses less than 12 months, Fair Value	$ 85,153	$ 109,688
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses	191	1,291
Held to Maturity, Losses 12 months or longer, Fair Value	1,953,443	2,100,656
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	148,401	201,015
Held To Maturity Securities Unrealized Loss Position Fair Value, Total	2,038,596	2,210,344
Held to Maturity, Total, Gross Unrealized Losses	148,592	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	8,823	27,660
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses	86	840
Held to Maturity, Losses 12 months or longer, Fair Value	321,522	321,154
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	34,857	45,036
Held To Maturity Securities Unrealized Loss Position Fair Value, Total	330,345	348,814
Held to Maturity, Total, Gross Unrealized Losses	34,943	45,876
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held to Maturity, Losses less than 12 months, Fair Value	76,330	82,028
Held to Maturity, Losses less than 12 months, Gross Unrealized Losses	105	451
Held to Maturity, Losses 12 months or longer, Fair Value	432,533	497,999
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	14,984	20,416
Held To Maturity Securities Unrealized Loss Position Fair Value, Total	508,863	580,027
Held to Maturity, Total, Gross Unrealized Losses	15,089	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	491,949	511,531
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	42,703	61,525
Held To Maturity Securities Unrealized Loss Position Fair Value, Total	491,949	511,531
Held to Maturity, Total, Gross Unrealized Losses	42,703	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	686,054	745,750
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	55,032	72,854
Held To Maturity Securities Unrealized Loss Position Fair Value, Total	686,054	745,750
Held to Maturity, Total, Gross Unrealized Losses	55,032	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	21,385	24,222
Held to Maturity, Losses 12 months or longer, Gross Unrealized Losses	825	1,184
Held To Maturity Securities Unrealized Loss Position Fair Value, Total	21,385	24,222
Held to Maturity, Total, Gross Unrealized Losses	$ 825	$ 1,184