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Securities (Amortized Cost and Fair Value of Debt Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized cost	$ 2,780,990	$ 2,852,495
Securities Held to Maturity, Gross unrealized gains	765	774
Securities Held to Maturity, Gross unrealized losses	241,499	237,871
Securities Held to Maturity, Fair value	2,540,256	2,615,398
U.S. Treasury And Government Agency Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized cost	422,789	426,454
Securities Held to Maturity, Gross unrealized gains	96	21
Securities Held to Maturity, Gross unrealized losses	49,405	49,044
Securities Held to Maturity, Fair value	373,480	377,431
Municipal Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized cost	683,143	698,908
Securities Held to Maturity, Gross unrealized gains	669	753
Securities Held to Maturity, Gross unrealized losses	26,561	26,558
Securities Held to Maturity, Fair value	657,251	673,103
Residential Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized cost	694,693	734,478
Securities Held to Maturity, Gross unrealized losses	71,754	72,532
Securities Held to Maturity, Fair value	622,939	661,946
Commercial Mortgage-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized cost	942,272	948,691
Securities Held to Maturity, Gross unrealized losses	91,213	87,211
Securities Held to Maturity, Fair value	851,059	861,480
Collateralized Mortgage Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Securities Held to Maturity, Gross Amortized cost	38,093	43,964
Securities Held to Maturity, Gross unrealized losses	2,566	2,526
Securities Held to Maturity, Fair value	$ 35,527	$ 41,438

X

- Definition

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

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