CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net Income (Loss) Attributable to Parent	$ 45,854	$ 49,070	$ 141,000	$ 140,998
Other Comprehensive Income (Loss), Net of Tax [Abstract]
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax	(76,417)	(140,312)	(71,669)	(422,728)
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax	18,341	33,675	17,201	101,455
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	2,657	(6)	14,436	(473)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	(638)	2	(3,465)	114
Other Comprehensive Income (Loss), Reclassification of provision for credit losses on securities—available-for-sale realized in earnings	(1,250)	0	750	0
Other Comprehensive Income (Loss), Income tax expense related to the reclassification of provision for credit losses on securities—available-for-sale realized in earnings	300	0	(180)	0
OCI, Debt Securities, Unrealized Gain (Loss) on Securities Transferred from Available-for-Sale to Held-to-Maturity, Before Tax	0	0	0	34,596
OCI, Debt Securities, Unrealized Gain (Loss) on Securities Transferred from Available-for-Sale to Held-to-Maturity, Tax	0	0	0	8,303
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax	617	754	1,773	1,982
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), Tax	(150)	(181)	(426)	(476)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax	3,090	(7,871)	6,472	(26,425)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	(741)	1,889	(1,553)	6,342
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, before Tax, after Reclassification Adjustment	953	(1,612)	8,573	(4,544)
Other Comprehensive Income (Loss), Change in Fair Value of Junior Subordinated Debentures, Tax	(229)	387	(2,058)	1,091
Reclassification of fair value of junior subordinated debentures redeemed	0	0	0	765
Other Comprehensive Income (Loss), Reclassification of Fair Value, Junior Subordinated Debentures Redeemed, Tax	0	0	0	(184)
Other Comprehensive Income (Loss), Net of Tax, Total	(53,467)	(113,275)	(30,146)	(369,374)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent, Total	$ (7,613)	$ (64,205)	$ 110,854	$ (228,376)