Borrowings, Short-Term Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Borrowings [Abstract]
FHLB, unused lines of credit available for short-term financing	$ 2,870,000	$ 2,900,000
Short-term borrowings [Abstract]
Balance at year-end	386,651	585,012
Federal Funds Purchased [Member]
Short-term borrowings [Abstract]
Balance at year-end	0	60,000	$ 0
Average during the year	24,575	14,644	17
Maximum month end balance	$ 60,000	$ 80,000	$ 0
Weighted average rate during the year	5.16%	4.02%	0.11%
Weighted average rate at year-end	5.63%	4.28%	0.00%
Securities Sold Under Repurchase Agreements [Member]
Short-term borrowings [Abstract]
Balance at year-end	$ 93,651	$ 86,012	$ 97,795
Average during the year	70,251	69,561	100,519
Maximum month end balance	$ 96,195	$ 88,637	$ 135,623
Weighted average rate during the year	1.06%	0.10%	0.13%
Weighted average rate at year-end	1.49%	0.11%	0.11%
Other Short-Term Borrowings [Member]
Short-term borrowings [Abstract]
Balance at year-end	$ 293,000	$ 439,000	$ 0
Average during the year	450,377	46,371	1,302
Maximum month end balance	$ 593,000	$ 439,000	$ 0
Weighted average rate during the year	5.24%	4.24%	2.02%
Weighted average rate at year-end	5.28%	4.45%	0.00%