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Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized cost	$ 2,653,759	$ 2,684,779
Securities Held to Maturity, Gross unrealized gains	739	1,431
Securities Held to Maturity, Gross unrealized losses	217,888	200,292
Securities Held to Maturity, Fair value	2,436,610	2,485,918
U.S. Treasury And Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized cost	409,435	413,490
Securities Held to Maturity, Gross unrealized gains		179
Securities Held to Maturity, Gross unrealized losses	48,083	43,971
Securities Held to Maturity, Fair value	361,352	369,698
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized cost	660,372	664,488
Securities Held to Maturity, Gross unrealized gains	739	1,252
Securities Held to Maturity, Gross unrealized losses	23,185	19,593
Securities Held to Maturity, Fair value	637,926	646,147
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized cost	636,208	654,262
Securities Held to Maturity, Gross unrealized losses	64,540	59,223
Securities Held to Maturity, Fair value	571,668	595,039
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized cost	917,008	920,048
Securities Held to Maturity, Gross unrealized losses	80,280	75,803
Securities Held to Maturity, Fair value	836,728	844,245
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized cost	30,736	32,491
Securities Held to Maturity, Gross unrealized losses	1,800	1,702
Securities Held to Maturity, Fair value	$ 28,936	$ 30,789

X

- Definition

Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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