Securities, Held to Maturity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Held-to-maturity securities, fair value to amortized cost [Abstract]
Amortized cost	$ 878,909		$ 878,909		$ 905,267
Unrealized gains	78		78		271
Unrealized losses	(98,497)		(98,497)		(91,014)
Estimated fair value	780,490		780,490		814,524
Transactions of HTM securities [Abstract]
Gains from calls on HTM securities	0	$ 0	0	$ 0
Asset Pledged as Collateral [Member] | Public Deposits or Other Purposes [Member]
Securities pledged [Abstract]
AFS and HTM securities	2,040,000		2,040,000		2,030,000
Asset Pledged as Collateral [Member] | Securities Sold under Repurchase Agreements [Member]
Securities pledged [Abstract]
AFS and HTM securities	198,900		198,900		177,200
Federal Agency [Member]
Held-to-maturity securities, fair value to amortized cost [Abstract]
Amortized cost	100,000		100,000		100,000
Unrealized gains	0		0		0
Unrealized losses	(18,048)		(18,048)		(17,784)
Estimated fair value	81,952		81,952		82,216
Mortgage-Backed, Government Sponsored Enterprises [Member]
Held-to-maturity securities, fair value to amortized cost [Abstract]
Amortized cost	218,862		218,862		228,720
Unrealized gains	0		0		0
Unrealized losses	(34,162)		(34,162)		(31,613)
Estimated fair value	184,700		184,700		197,107
Mortgage-Backed, U.S. Government Agency Securities [Member]
Held-to-maturity securities, fair value to amortized cost [Abstract]
Amortized cost	16,733		16,733		17,086
Unrealized gains	1		1		3
Unrealized losses	(734)		(734)		(566)
Estimated fair value	16,000		16,000		16,523
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]
Held-to-maturity securities, fair value to amortized cost [Abstract]
Amortized cost	177,833		177,833		187,457
Unrealized gains	0		0		57
Unrealized losses	(13,515)		(13,515)		(12,021)
Estimated fair value	164,318		164,318		175,493
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]
Held-to-maturity securities, fair value to amortized cost [Abstract]
Amortized cost	62,490		62,490		63,878
Unrealized gains	0		0		0
Unrealized losses	(11,533)		(11,533)		(10,908)
Estimated fair value	50,957		50,957		52,970
State & Municipal [Member]
Held-to-maturity securities, fair value to amortized cost [Abstract]
Amortized cost	302,991		302,991		308,126
Unrealized gains	77		77		211
Unrealized losses	(20,505)		(20,505)		(18,122)
Estimated fair value	$ 282,563		$ 282,563		$ 290,215