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
Apr. 01, 2022	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Allowance for loan losses:
Beginning balance	$ 362,510	$ 362,510	$ 342,880	$ 359,202	$ 340,243
Allowance for purchase credit deteriorated (PCD) loans	70,319	70,319		70,319
Loans charged-off		(5,267)	(12,374)	(7,862)	(21,174)
Charged-off loans recovered		2,947	3,008	5,592	5,753
Net (charge-offs) recoveries		(2,320)	(9,366)	(2,270)	(15,421)
Provision for loan losses		38,310	5,810	41,568	14,502
Ending balance		468,819	339,324	468,819	339,324
Charge-offs	62,400	62,400
Commercial and industrial
Allowance for loan losses:
Beginning balance	101,203	101,203	126,408	103,090	131,070
Allowance for purchase credit deteriorated (PCD) loans		33,452		33,452
Loans charged-off		(4,540)	(10,893)	(6,111)	(18,035)
Charged-off loans recovered		1,952	678	2,776	2,267
Net (charge-offs) recoveries		(2,588)	(10,215)	(3,335)	(15,768)
Provision for loan losses		12,472	(6,504)	11,332	(5,613)
Ending balance		144,539	109,689	144,539	109,689
Commercial Real Estate
Allowance for loan losses:
Beginning balance	219,949	219,949	174,236	217,490	164,113
Allowance for purchase credit deteriorated (PCD) loans		36,618		36,618
Loans charged-off		0	0	(173)	(382)
Charged-off loans recovered		224	665	331	734
Net (charge-offs) recoveries		224	665	158	352
Provision for loan losses		20,436	14,238	22,961	24,674
Ending balance		277,227	189,139	277,227	189,139
Residential Mortgage
Allowance for loan losses:
Beginning balance	28,189	28,189	27,172	25,120	28,873
Allowance for purchase credit deteriorated (PCD) loans		206		206
Loans charged-off		(1)	(1)	(27)	(139)
Charged-off loans recovered		74	191	531	348
Net (charge-offs) recoveries		73	190	504	209
Provision for loan losses		1,421	(2,059)	4,059	(3,779)
Ending balance		29,889	25,303	29,889	25,303
Consumer
Allowance for loan losses:
Beginning balance	$ 13,169	13,169	15,064	13,502	16,187
Allowance for purchase credit deteriorated (PCD) loans		43		43
Loans charged-off		(726)	(1,480)	(1,551)	(2,618)
Charged-off loans recovered		697	1,474	1,954	2,404
Net (charge-offs) recoveries		(29)	(6)	403	(214)
Provision for loan losses		3,981	135	3,216	(780)
Ending balance		$ 17,164	$ 15,193	$ 17,164	$ 15,193

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 19
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919265-210447

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 13
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-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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