Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Total loans	$ 28,336,244	$ 13,601,846
Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	28,336,244	13,601,846
Commercial
Financing Receivable, Past Due [Line Items]
Total loans	8,624,253	3,391,769
Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	8,434,673	3,200,212
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	11,337,735	6,380,674
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	11,183,002	6,221,484
BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	344,313	350,747
Residential real estate
Financing Receivable, Past Due [Line Items]
Total loans	5,706,155	2,255,289
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	5,706,155	2,255,289
Indirect
Financing Receivable, Past Due [Line Items]
Total loans	906,526	873,139
Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	906,526	873,139
Direct
Financing Receivable, Past Due [Line Items]
Total loans	680,690	140,385
Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	680,690	140,385
Home equity
Financing Receivable, Past Due [Line Items]
Total loans	1,080,885	560,590
Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	1,080,885	560,590
Total Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	227,192	37,862
Total Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	41,615	4,943
Total Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	136,577	8,724
Total Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	1,228	1,018
Total Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	29,948	15,191
Total Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	4,344	5,309
Total Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	7,194	1,008
Total Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	6,286	1,669
30-59 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	106,362	18,413
30-59 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	27,863	2,723
30-59 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	49,697	1,402
30-59 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	1,044	747
30-59 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	17,624	8,273
30-59 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	3,277	3,888
30-59 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	4,778	687
30-59 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	2,079	693
60-89 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	24,552	4,648
60-89 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	6,831	617
60-89 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	14,086	280
60-89 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	20	162
60-89 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	1,591	2,364
60-89 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	598	867
60-89 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	897	159
60-89 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	529	199
Past Due 90 Days or More | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	96,278	14,801
Past Due 90 Days or More | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	6,921	1,603
Past Due 90 Days or More | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	72,794	7,042
Past Due 90 Days or More | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	164	109
Past Due 90 Days or More | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	10,733	4,554
Past Due 90 Days or More | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	469	554
Past Due 90 Days or More | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	1,519	162
Past Due 90 Days or More | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	3,678	777
Current | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	28,109,052	13,563,984
Current | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	8,393,058	3,195,269
Current | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	11,046,425	6,212,760
Current | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	343,085	349,729
Current | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	5,676,207	2,240,098
Current | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	902,182	867,830
Current | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	673,496	139,377
Current | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	$ 1,074,599	$ 558,921