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Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Total loans	$ 30,528,933	$ 13,601,846
Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	30,528,933	13,601,846
Commercial
Financing Receivable, Past Due [Line Items]
Total loans	9,311,148	3,391,769
Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	9,113,979	3,200,212
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	12,227,888	6,380,674
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	12,074,104	6,221,484
BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	350,953	350,747
Residential real estate
Financing Receivable, Past Due [Line Items]
Total loans	6,267,306	2,255,289
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	6,267,306	2,255,289
Indirect
Financing Receivable, Past Due [Line Items]
Total loans	1,004,054	873,139
Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	1,004,054	873,139
Direct
Financing Receivable, Past Due [Line Items]
Total loans	674,943	140,385
Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	674,943	140,385
Home equity
Financing Receivable, Past Due [Line Items]
Total loans	1,043,594	560,590
Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	1,043,594	560,590
Total Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	153,470	37,862
Total Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	21,218	4,943
Total Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	58,307	8,724
Total Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	254	1,018
Total Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	45,627	15,191
Total Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	7,514	5,309
Total Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	9,888	1,008
Total Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	10,662	1,669
30-59 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	76,216	18,413
30-59 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	8,575	2,723
30-59 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	23,786	1,402
30-59 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	78	747
30-59 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	29,394	8,273
30-59 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	4,929	3,888
30-59 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	4,459	687
30-59 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	4,995	693
60-89 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	21,206	4,648
60-89 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	758	617
60-89 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	7,235	280
60-89 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	92	162
60-89 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	7,382	2,364
60-89 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	1,735	867
60-89 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	2,926	159
60-89 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	1,078	199
Past Due 90 Days or More | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	56,048	14,801
Past Due 90 Days or More | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	11,885	1,603
Past Due 90 Days or More | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	27,286	7,042
Past Due 90 Days or More | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	84	109
Past Due 90 Days or More | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	8,851	4,554
Past Due 90 Days or More | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	850	554
Past Due 90 Days or More | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	2,503	162
Past Due 90 Days or More | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	4,589	777
Current | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	30,375,463	13,563,984
Current | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	9,092,761	3,195,269
Current | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	12,015,797	6,212,760
Current | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	350,699	349,729
Current | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	6,221,679	2,240,098
Current | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	996,540	867,830
Current | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	665,055	139,377
Current | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	$ 1,032,932	$ 558,921

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: 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

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3B
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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