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Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Total loans	$ 29,553,648	$ 13,601,846
Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	29,553,648	13,601,846
Commercial
Financing Receivable, Past Due [Line Items]
Total loans	8,923,983	3,391,769
Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	8,731,987	3,200,212
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	11,796,503	6,380,674
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	11,641,734	6,221,484
BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	346,765	350,747
Residential real estate
Financing Receivable, Past Due [Line Items]
Total loans	6,079,057	2,255,289
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	6,079,057	2,255,289
Indirect
Financing Receivable, Past Due [Line Items]
Total loans	981,741	873,139
Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	981,741	873,139
Direct
Financing Receivable, Past Due [Line Items]
Total loans	674,512	140,385
Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	674,512	140,385
Home equity
Financing Receivable, Past Due [Line Items]
Total loans	1,097,852	560,590
Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	1,097,852	560,590
Total Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	169,628	37,862
Total Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	18,798	4,943
Total Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	70,367	8,724
Total Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	666	1,018
Total Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	54,817	15,191
Total Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	5,175	5,309
Total Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	9,509	1,008
Total Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	10,296	1,669
30-59 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	63,282	18,413
30-59 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	3,364	2,723
30-59 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	7,061	1,402
30-59 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	129	747
30-59 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	37,902	8,273
30-59 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	4,140	3,888
30-59 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	6,496	687
30-59 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	4,190	693
60-89 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	10,580	4,648
60-89 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	117	617
60-89 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	3,320	280
60-89 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	167	162
60-89 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	4,304	2,364
60-89 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	673	867
60-89 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	969	159
60-89 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	1,030	199
Past Due 90 Days or More | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	95,766	14,801
Past Due 90 Days or More | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	15,317	1,603
Past Due 90 Days or More | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	59,986	7,042
Past Due 90 Days or More | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	370	109
Past Due 90 Days or More | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	12,611	4,554
Past Due 90 Days or More | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	362	554
Past Due 90 Days or More | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	2,044	162
Past Due 90 Days or More | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	5,076	777
Current | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	29,384,020	13,563,984
Current | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	8,713,189	3,195,269
Current | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	11,571,367	6,212,760
Current | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	346,099	349,729
Current | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	6,024,240	2,240,098
Current | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	976,566	867,830
Current | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	665,003	139,377
Current | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	$ 1,087,556	$ 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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