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Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	$ 2,051,628	$ 2,132,882
Securities Held to Maturity, Gross Unrealized Gains	641	956
Securities Held to Maturity, Gross Unrealized Losses	125,540	122,812
Securities Held to Maturity, Fair Value	1,926,729	2,011,026
U.S. Treasury And Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	368,667	373,605
Securities Held to Maturity, Gross Unrealized Gains	271	248
Securities Held to Maturity, Gross Unrealized Losses	29,171	30,143
Securities Held to Maturity, Fair Value	339,767	343,710
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	457,346	511,516
Securities Held to Maturity, Gross Unrealized Gains	370	708
Securities Held to Maturity, Gross Unrealized Losses	11,556	11,455
Securities Held to Maturity, Fair Value	446,160	500,769
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	480,249	497,338
Securities Held to Maturity, Gross Unrealized Losses	35,764	34,239
Securities Held to Maturity, Fair Value	444,485	463,099
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	728,004	731,329
Securities Held to Maturity, Gross Unrealized Losses	48,510	46,455
Securities Held to Maturity, Fair Value	679,494	684,874
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized Cost	17,362	19,094
Securities Held to Maturity, Gross Unrealized Losses	539	520
Securities Held to Maturity, Fair Value	$ 16,823	$ 18,574

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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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