Short and Long-Term Funding (Tables)

6 Months Ended

Jun. 30, 2025

Debt Disclosure [Abstract]

Schedule of Debt [Table Text Block]

The following table presents the components of short-term funding (funding with original contractual maturities of one year or less), and long-term funding (funding with original contractual maturities greater than one year):

(Dollars in thousands)	Jun 30, 2025		Dec 31, 2024
Short-term funding
Federal funds purchased	$	145	$	370,325
Securities sold under agreements to repurchase	75,440		100,044
Federal funds purchased and securities sold under agreements to repurchase	$	75,585	$	470,369
Long-term funding
Corporation senior notes, at par	$	300,000	$	300,000
Corporation subordinated notes, at par	300,000		550,000
Discount and capitalized costs	(8,074)		(8,664)
Subordinated debt fair value hedge(a)	1,354		(3,996)
Finance leases	250		295
Total long-term funding	$	593,530	$	837,635
Total short and long-term funding, excluding FHLB advances	$	669,115	$	1,308,004
FHLB advances
Short-term FHLB advances	$	3,470,000	$	1,250,000
Long-term FHLB advances	411,486		611,551
FHLB advances fair value hedge(a)	(1,997)		(7,744)
Total FHLB advances	$	3,879,489	$	1,853,807
Total short and long-term funding	$	4,548,604	$	3,161,811

(a) For additional information on the fair value hedges, see Note 9.

Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table Text Block]

The remaining contractual maturity of the securities sold under agreements to repurchase on the consolidated balance sheets is presented in the following table:

	Overnight and Continuous
(in thousands)	Jun 30, 2025		Dec 31, 2024
Repurchase agreements
Agency mortgage-related securities	$	75,440	$	100,044