Investment Securities Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
HTM, at amortized cost	$ 1,321,256	$ 980,384
Estimated Fair Value	1,125,049
Proceeds from sales of AFS securities	196,411	359,137	$ 215,150
Visa
Gain on sale of Visa shares		34,000
Collateral Pledged
Available-for-sale securities pledged as collateral	$ 1,100,000	2,500,000
Debt securities
HTM, at amortized cost			79,000
Estimated Fair Value			82,000
Net investment securities gains			3,000
Prepayment penalty on FHLB advances			$ 2,900
State and municipal securities
HTM, at amortized cost		980,384
Estimated Fair Value		965,867
Auction rate securities
Proceeds from sales of AFS securities		$ 24,600