Securities Securities (Reconciliation of amortized cost of held to maturity securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	$ 176	$ 90
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(121,002)	(143,245)
Debt Securities, Held-to-maturity, Fair Value	1,289,133	1,291,801
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	1,409,959	1,434,956
Small Business Administration Pooled Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	72	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(5,408)	(8,135)
Debt Securities, Held-to-maturity, Fair Value	114,593	114,733
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	119,929	122,868
Collateralized Debt Obligations [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(57,431)	(65,143)
Debt Securities, Held-to-maturity, Fair Value	352,755	357,684
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	410,186	422,827
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	104	90
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(51,897)	(62,198)
Debt Securities, Held-to-maturity, Fair Value	727,239	726,362
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	779,032	788,470
US Treasury Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(6,266)	(7,769)
Debt Securities, Held-to-maturity, Fair Value	94,546	93,022
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	$ 100,812	$ 100,791