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Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Total loans	$ 13,584,828	$ 13,786,479
Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	13,584,828	13,786,479
Commercial
Financing Receivable, Past Due [Line Items]
Total loans	3,505,183	3,956,422
Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	3,312,793	3,757,700
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	6,290,632	5,946,512
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	6,132,335	5,774,811
BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	350,687	370,423
Residential real estate
Financing Receivable, Past Due [Line Items]
Total loans	2,224,782	2,248,422
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	2,224,782	2,248,422
Indirect
Financing Receivable, Past Due [Line Items]
Total loans	860,785	913,902
Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	860,785	913,902
Direct
Financing Receivable, Past Due [Line Items]
Total loans	149,124	164,807
Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	149,124	164,807
Home equity
Financing Receivable, Past Due [Line Items]
Total loans	554,322	556,414
Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	554,322	556,414
Total Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	40,739	69,967
Total Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	1,922	5,741
Total Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	16,353	28,287
Total Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	338	1,837
Total Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	15,347	22,601
Total Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	4,174	6,674
Total Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	783	1,712
Total Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	1,822	3,115
30-59 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	13,377	23,447
30-59 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	509	2,977
30-59 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	1,401	887
30-59 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	0	894
30-59 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	7,592	11,639
30-59 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	3,160	5,222
30-59 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	391	753
30-59 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	324	1,075
60-89 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	4,237	6,840
60-89 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	663	664
60-89 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	83	128
60-89 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	38	882
60-89 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	2,140	3,296
60-89 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	552	960
60-89 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	175	533
60-89 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	586	377
Past Due 90 Days or More | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	23,125	39,680
Past Due 90 Days or More | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	750	2,100
Past Due 90 Days or More | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	14,869	27,272
Past Due 90 Days or More | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	300	61
Past Due 90 Days or More | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	5,615	7,666
Past Due 90 Days or More | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	462	492
Past Due 90 Days or More | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	217	426
Past Due 90 Days or More | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	912	1,663
Current | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	13,544,089	13,716,512
Current | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	3,310,871	3,751,959
Current | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	6,115,982	5,746,524
Current | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	350,349	368,586
Current | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	2,209,435	2,225,821
Current | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	856,611	907,228
Current | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	148,341	163,095
Current | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Past Due [Line Items]
Total loans	$ 552,500	$ 553,299

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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 5
-Subparagraph (b)
-URI http://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 http://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 http://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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