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Loans and Allowance for Credit Losses for Loans - Summary of Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2021
Allowance for loan losses:
Beginning balance	$ 436,898	$ 362,510	$ 458,655	$ 359,202
Allowance for PCD loans					$ 70,319
Loans charged-off	(11,327)	(5,267)	(43,900)	(7,862)
Charged-off loans recovered	2,702	2,947	4,907	5,592
Net charge-offs	(8,625)	(2,320)	(38,993)	(2,270)
Provision for loan losses	8,159	38,310	18,138	41,568
Ending balance	436,432	468,819	436,432	468,819	359,202
Loans acquired with discounts related to credit quality
Allowance for loan losses:
Loans charged-off		(62,400)
Cumulative Effect, Period of Adoption, Adjustment
Allowance for loan losses:
Beginning balance		70,319	(1,368)
Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses:
Beginning balance			457,287
Commercial and industrial
Allowance for loan losses:
Beginning balance	127,992	101,203	139,941	103,090
Allowance for PCD loans					33,452
Loans charged-off	(3,865)	(4,540)	(29,912)	(6,111)
Charged-off loans recovered	2,173	1,952	3,572	2,776
Net charge-offs	(1,692)	(2,588)	(26,340)	(3,335)
Provision for loan losses	1,945	12,472	15,383	11,332
Ending balance	128,245	144,539	128,245	144,539	103,090
Commercial and industrial \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for loan losses:
Beginning balance		33,452	(739)
Commercial and industrial \| Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses:
Beginning balance			139,202
Commercial Real Estate
Allowance for loan losses:
Beginning balance	243,332	219,949	259,408	217,490
Allowance for PCD loans					36,618
Loans charged-off	(6,273)	0	(11,971)	(173)
Charged-off loans recovered	4	224	28	331
Net charge-offs	(6,269)	224	(11,943)	158
Provision for loan losses	2,632	20,436	(7,181)	22,961
Ending balance	239,695	277,227	239,695	277,227	217,490
Commercial Real Estate \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for loan losses:
Beginning balance		36,618	(589)
Commercial Real Estate \| Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses:
Beginning balance			258,819
Residential Mortgage
Allowance for loan losses:
Beginning balance	41,708	28,189	39,020	25,120
Allowance for PCD loans					206
Loans charged-off	(149)	(1)	(149)	(27)
Charged-off loans recovered	135	74	156	531
Net charge-offs	(14)	73	7	504
Provision for loan losses	2,459	1,421	5,138	4,059
Ending balance	44,153	29,889	44,153	29,889	25,120
Residential Mortgage \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for loan losses:
Beginning balance		206	(12)
Residential Mortgage \| Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses:
Beginning balance			39,008
Consumer
Allowance for loan losses:
Beginning balance	23,866	13,169	20,286	13,502
Allowance for PCD loans					43
Loans charged-off	(1,040)	(726)	(1,868)	(1,551)
Charged-off loans recovered	390	697	1,151	1,954
Net charge-offs	(650)	(29)	(717)	403
Provision for loan losses	1,123	3,981	4,798	3,216
Ending balance	$ 24,339	17,164	24,339	$ 17,164	$ 13,502
Consumer \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for loan losses:
Beginning balance		$ 43	(28)
Consumer \| Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses:
Beginning balance			$ 20,258